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Home / Local Weather & Traffic / California / Portola Valley / Weather Forecast For 10 Days

Portola Valley, CA Weather Forecast | 10 Days

Updated: Fri Sep 18th 2026 4:15 AM PDT
Fri, 9-18
9-18
72°F
57°F
Sat, 9-19
9-19
72°F
55°F
Sun, 9-20
9-20
67°F
55°F
Mon, 9-21
9-21
70°F
55°F
Tue, 9-22
9-22
73°F
56°F
Wed, 9-23
9-23
81°F
62°F
Thu, 9-24
9-24
75°F
58°F
Fri, 9-25
9-25
63°F
55°F
Sat, 9-26
9-26
64°F
54°F
Sun, 9-27
9-27
65°F
56°F

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9-18

Sunny

Fri 9-18

Sunny with a high of 72°F and a low of 57°F. There's a very small chance of rainfall, only about 7%. Winds will be light at 10mph and gusts of 18.1mph at 12 PM. The humidity will be on the higher side, averaging about 75%, the maximum being 92% at 11 PM and 47% being its lowest at 3 PM. Barometric pressure is its highest of 30.12inHg at 8 AM, a lowest point of 30.01inHg at 5 PM with an avg 30.07inHg.

    • HI: 72°F
    • LO: 57°F
    • Rain: 7%
    • Snow: 0%
    • Wind
      9.2 mph
    • Humidity
      75% avg.
    • UV Index
      6.9
    • Air Quality
      Good
    • Sunrise
      06:53 AM
    • Sunset
      07:12 PM
    • Moonrise
      02:59 PM
    • Moonset
      Does not set today
    • Moon Phase
      First Quarter
  • Hourly
5 AM Clear at 5 AM on Sep 18
Clear
57°F
13%
rain
0%
snow
2.9 mph SW
wind
30.09 inHg
pressure
6 AM Clear at 6 AM on Sep 18
Clear
57°F
13%
rain
0%
snow
3.1 mph WSW
wind
30.1 inHg
pressure
7 AM Sunny at 7 AM on Sep 18
Sunny
57°F
14%
rain
0%
snow
2.9 mph SW
wind
30.11 inHg
pressure
8 AM Sunny at 8 AM on Sep 18
Sunny
58°F
12%
rain
0%
snow
2.7 mph WSW
wind
30.12 inHg
pressure
9 AM Sunny at 9 AM on Sep 18
Sunny
61°F
8%
rain
0%
snow
2.9 mph W
wind
30.12 inHg
pressure
10 AM Sunny at 10 AM on Sep 18
Sunny
65°F
5%
rain
0%
snow
4.3 mph NW
wind
30.12 inHg
pressure
11 AM Sunny at 11 AM on Sep 18
Sunny
67°F
4%
rain
0%
snow
5.8 mph NW
wind
30.11 inHg
pressure
12 PM Sunny at 12 PM on Sep 18
Sunny
68°F
3%
rain
0%
snow
6.9 mph NNW
wind
30.1 inHg
pressure
1 PM Sunny at 1 PM on Sep 18
Sunny
70°F
2%
rain
0%
snow
7.8 mph NW
wind
30.08 inHg
pressure
2 PM Sunny at 2 PM on Sep 18
Sunny
72°F
2%
rain
0%
snow
8.7 mph NW
wind
30.06 inHg
pressure
3 PM Sunny at 3 PM on Sep 18
Sunny
72°F
1%
rain
0%
snow
8.3 mph NW
wind
30.04 inHg
pressure
4 PM Sunny at 4 PM on Sep 18
Sunny
72°F
1%
rain
0%
snow
9.2 mph WNW
wind
30.03 inHg
pressure
5 PM Sunny at 5 PM on Sep 18
Sunny
71°F
2%
rain
0%
snow
8.1 mph WNW
wind
30.01 inHg
pressure
6 PM Sunny at 6 PM on Sep 18
Sunny
68°F
2%
rain
0%
snow
7.8 mph W
wind
30.01 inHg
pressure
7 PM Sunny at 7 PM on Sep 18
Sunny
63°F
7%
rain
0%
snow
6.9 mph WSW
wind
30.01 inHg
pressure
8 PM Clear at 8 PM on Sep 18
Clear
60°F
13%
rain
0%
snow
6 mph WSW
wind
30.03 inHg
pressure
9 PM Clear at 9 PM on Sep 18
Clear
59°F
15%
rain
0%
snow
5.6 mph SW
wind
30.04 inHg
pressure
10 PM Partly Cloudy at 10 PM on Sep 18
Partly Cloudy
58°F
17%
rain
0%
snow
5.4 mph SW
wind
30.04 inHg
pressure
11 PM Partly Cloudy at 11 PM on Sep 18
Partly Cloudy
58°F
18%
rain
0%
snow
5.8 mph SW
wind
30.02 inHg
pressure
9-19

Sunny

Sat 9-19

Sunny with a high of 72°F and a low of 55°F. There's a very small chance of rainfall, only about 10%. Winds will be light at 9mph and gusts of 19mph at 2 PM. The humidity will be on the higher side, averaging about 77%, the maximum being 93% at 12 AM and 50% being its lowest at 3 PM. Barometric pressure is its highest of 30.02inHg at 12 AM, a lowest point of 29.92inHg at 5 PM with an avg 29.97inHg.

    • HI: 72°F
    • LO: 55°F
    • Rain: 10%
    • Snow: 0%
    • Wind
      8.7 mph
    • Humidity
      77% avg.
    • UV Index
      7.2
    • Air Quality
      Good
    • Sunrise
      06:54 AM
    • Sunset
      07:11 PM
    • Moonrise
      03:44 PM
    • Moonset
      12:07 AM
    • Moon Phase
      First Quarter
  • Hourly
12 AM Partly Cloudy at 12 AM on Sep 19
Partly Cloudy
57°F
19%
rain
0%
snow
5.8 mph SW
wind
30.02 inHg
pressure
1 AM Partly Cloudy at 1 AM on Sep 19
Partly Cloudy
56°F
20%
rain
0%
snow
5.1 mph SW
wind
30.01 inHg
pressure
2 AM Partly Cloudy at 2 AM on Sep 19
Partly Cloudy
56°F
20%
rain
0%
snow
5.4 mph SW
wind
30.01 inHg
pressure
3 AM Partly Cloudy at 3 AM on Sep 19
Partly Cloudy
56°F
20%
rain
0%
snow
4.7 mph SW
wind
30 inHg
pressure
4 AM Partly Cloudy at 4 AM on Sep 19
Partly Cloudy
55°F
19%
rain
0%
snow
4.7 mph SW
wind
30 inHg
pressure
5 AM Clear at 5 AM on Sep 19
Clear
56°F
17%
rain
0%
snow
4 mph SW
wind
30 inHg
pressure
6 AM Partly Cloudy at 6 AM on Sep 19
Partly Cloudy
56°F
17%
rain
0%
snow
3.8 mph SW
wind
29.99 inHg
pressure
7 AM Sunny at 7 AM on Sep 19
Sunny
56°F
16%
rain
0%
snow
3.6 mph SW
wind
30 inHg
pressure
8 AM Sunny at 8 AM on Sep 19
Sunny
56°F
12%
rain
0%
snow
2.9 mph SW
wind
30 inHg
pressure
9 AM Sunny at 9 AM on Sep 19
Sunny
61°F
7%
rain
0%
snow
2.2 mph SW
wind
30 inHg
pressure
10 AM Sunny at 10 AM on Sep 19
Sunny
66°F
4%
rain
0%
snow
1.1 mph W
wind
30 inHg
pressure
11 AM Sunny at 11 AM on Sep 19
Sunny
69°F
2%
rain
0%
snow
2.9 mph NNW
wind
29.99 inHg
pressure
12 PM Sunny at 12 PM on Sep 19
Sunny
70°F
2%
rain
0%
snow
5.8 mph NW
wind
29.97 inHg
pressure
1 PM Sunny at 1 PM on Sep 19
Sunny
71°F
2%
rain
0%
snow
7.2 mph NW
wind
29.95 inHg
pressure
2 PM Sunny at 2 PM on Sep 19
Sunny
72°F
2%
rain
0%
snow
7.8 mph WNW
wind
29.94 inHg
pressure
3 PM Sunny at 3 PM on Sep 19
Sunny
72°F
2%
rain
0%
snow
8.1 mph WNW
wind
29.93 inHg
pressure
4 PM Sunny at 4 PM on Sep 19
Sunny
70°F
3%
rain
0%
snow
8.7 mph WNW
wind
29.92 inHg
pressure
5 PM Sunny at 5 PM on Sep 19
Sunny
67°F
3%
rain
0%
snow
8.1 mph W
wind
29.92 inHg
pressure
6 PM Partly Cloudy at 6 PM on Sep 19
Partly Cloudy
64°F
9%
rain
0%
snow
7.4 mph W
wind
29.93 inHg
pressure
7 PM Cloudy at 7 PM on Sep 19
Cloudy
59°F
18%
rain
0%
snow
6.3 mph WSW
wind
29.94 inHg
pressure
8 PM Cloudy at 8 PM on Sep 19
Cloudy
58°F
25%
rain
0%
snow
6 mph WSW
wind
29.95 inHg
pressure
9 PM Cloudy at 9 PM on Sep 19
Cloudy
57°F
24%
rain
0%
snow
6.3 mph WSW
wind
29.96 inHg
pressure
10 PM Partly Cloudy at 10 PM on Sep 19
Partly Cloudy
57°F
17%
rain
0%
snow
5.6 mph WSW
wind
29.96 inHg
pressure
11 PM Partly Cloudy at 11 PM on Sep 19
Partly Cloudy
56°F
18%
rain
0%
snow
5.8 mph WSW
wind
29.96 inHg
pressure
9-20

Sunny

Sun 9-20

Sunny with a high of 67°F and a low of 55°F. There might be light rainfall having a 15% chance. Winds will be light at 10mph and gusts of 13.6mph at 12 PM. The humidity will be on the higher side, averaging about 79%, the maximum being 91% at 12 AM and 58% being its lowest at 1 PM. Barometric pressure is its highest of 29.97inHg at 10 AM, a lowest point of 29.91inHg at 5 PM with an avg 29.94inHg.

    • HI: 67°F
    • LO: 55°F
    • Rain: 15%
    • Snow: 0%
    • Wind
      9.2 mph
    • Humidity
      79% avg.
    • UV Index
      5.5
    • Air Quality
      Good
    • Sunrise
      06:55 AM
    • Sunset
      07:09 PM
    • Moonrise
      04:22 PM
    • Moonset
      01:06 AM
    • Moon Phase
      Waxing Gibbous
  • Hourly
12 AM Partly Cloudy at 12 AM on Sep 20
Partly Cloudy
56°F
19%
rain
0%
snow
5.4 mph WSW
wind
29.95 inHg
pressure
1 AM Partly Cloudy at 1 AM on Sep 20
Partly Cloudy
55°F
18%
rain
0%
snow
5.6 mph SW
wind
29.95 inHg
pressure
2 AM Partly Cloudy at 2 AM on Sep 20
Partly Cloudy
55°F
17%
rain
0%
snow
4.7 mph SW
wind
29.94 inHg
pressure
3 AM Clear at 3 AM on Sep 20
Clear
55°F
15%
rain
0%
snow
4.7 mph SW
wind
29.93 inHg
pressure
4 AM Clear at 4 AM on Sep 20
Clear
55°F
15%
rain
0%
snow
4.5 mph SW
wind
29.93 inHg
pressure
5 AM Clear at 5 AM on Sep 20
Clear
55°F
15%
rain
0%
snow
4.3 mph WSW
wind
29.93 inHg
pressure
6 AM Clear at 6 AM on Sep 20
Clear
55°F
15%
rain
0%
snow
4.9 mph WSW
wind
29.94 inHg
pressure
7 AM Sunny at 7 AM on Sep 20
Sunny
55°F
16%
rain
0%
snow
4.9 mph WSW
wind
29.95 inHg
pressure
8 AM Sunny at 8 AM on Sep 20
Sunny
56°F
14%
rain
0%
snow
4.3 mph WSW
wind
29.96 inHg
pressure
9 AM Sunny at 9 AM on Sep 20
Sunny
59°F
11%
rain
0%
snow
5.1 mph W
wind
29.96 inHg
pressure
10 AM Cloudy at 10 AM on Sep 20
Cloudy
62°F
16%
rain
0%
snow
5.4 mph W
wind
29.97 inHg
pressure
11 AM Cloudy at 11 AM on Sep 20
Cloudy
64°F
11%
rain
0%
snow
6.3 mph WNW
wind
29.96 inHg
pressure
12 PM Overcast at 12 PM on Sep 20
Overcast
67°F
13%
rain
0%
snow
6.9 mph WNW
wind
29.96 inHg
pressure
1 PM Overcast at 1 PM on Sep 20
Overcast
67°F
14%
rain
0%
snow
7.4 mph WNW
wind
29.94 inHg
pressure
2 PM Overcast at 2 PM on Sep 20
Overcast
67°F
14%
rain
0%
snow
7.8 mph WNW
wind
29.93 inHg
pressure
3 PM Overcast at 3 PM on Sep 20
Overcast
67°F
14%
rain
0%
snow
8.9 mph WNW
wind
29.92 inHg
pressure
4 PM Overcast at 4 PM on Sep 20
Overcast
66°F
15%
rain
0%
snow
9.2 mph WNW
wind
29.92 inHg
pressure
5 PM Overcast at 5 PM on Sep 20
Overcast
64°F
17%
rain
0%
snow
8.5 mph WNW
wind
29.91 inHg
pressure
6 PM Overcast at 6 PM on Sep 20
Overcast
61°F
20%
rain
0%
snow
7.6 mph W
wind
29.92 inHg
pressure
7 PM Cloudy at 7 PM on Sep 20
Cloudy
58°F
23%
rain
0%
snow
6.7 mph W
wind
29.92 inHg
pressure
8 PM Partly Cloudy at 8 PM on Sep 20
Partly Cloudy
56°F
19%
rain
0%
snow
6 mph W
wind
29.93 inHg
pressure
9 PM Partly Cloudy at 9 PM on Sep 20
Partly Cloudy
56°F
18%
rain
0%
snow
6 mph W
wind
29.95 inHg
pressure
10 PM Partly Cloudy at 10 PM on Sep 20
Partly Cloudy
56°F
21%
rain
0%
snow
5.8 mph W
wind
29.96 inHg
pressure
11 PM Cloudy at 11 PM on Sep 20
Cloudy
56°F
22%
rain
0%
snow
6.3 mph W
wind
29.96 inHg
pressure
9-21

Sunny

Mon 9-21

Sunny with a high of 70°F and a low of 55°F. There's a very small chance of rainfall, only about 10%. Winds will be light at 8mph and gusts of 16.6mph at 8 PM. The humidity will be on the higher side, averaging about 76%, the maximum being 91% at 10 PM and 52% being its lowest at 3 PM. Barometric pressure is its highest of 29.95inHg at 12 AM, a lowest point of 29.87inHg at 5 PM with an avg 29.92inHg.

    • HI: 70°F
    • LO: 55°F
    • Rain: 10%
    • Snow: 0%
    • Wind
      7.6 mph
    • Humidity
      76% avg.
    • UV Index
      6.3
    • Air Quality
      Good
    • Sunrise
      06:55 AM
    • Sunset
      07:07 PM
    • Moonrise
      04:54 PM
    • Moonset
      02:06 AM
    • Moon Phase
      Waxing Gibbous
  • Hourly
12 AM Cloudy at 12 AM on Sep 21
Cloudy
57°F
20%
rain
0%
snow
6.5 mph W
wind
29.95 inHg
pressure
1 AM Cloudy at 1 AM on Sep 21
Cloudy
57°F
18%
rain
0%
snow
5.8 mph W
wind
29.94 inHg
pressure
2 AM Partly Cloudy at 2 AM on Sep 21
Partly Cloudy
56°F
17%
rain
0%
snow
4.9 mph WSW
wind
29.93 inHg
pressure
3 AM Cloudy at 3 AM on Sep 21
Cloudy
56°F
23%
rain
0%
snow
4.9 mph W
wind
29.93 inHg
pressure
4 AM Partly Cloudy at 4 AM on Sep 21
Partly Cloudy
55°F
19%
rain
0%
snow
4.7 mph WSW
wind
29.93 inHg
pressure
5 AM Partly Cloudy at 5 AM on Sep 21
Partly Cloudy
55°F
20%
rain
0%
snow
4.3 mph WSW
wind
29.94 inHg
pressure
6 AM Cloudy at 6 AM on Sep 21
Cloudy
55°F
21%
rain
0%
snow
4 mph SW
wind
29.94 inHg
pressure
7 AM Partly Cloudy at 7 AM on Sep 21
Partly Cloudy
55°F
17%
rain
0%
snow
4.3 mph SSW
wind
29.94 inHg
pressure
8 AM Sunny at 8 AM on Sep 21
Sunny
55°F
12%
rain
0%
snow
4 mph SSW
wind
29.95 inHg
pressure
9 AM Sunny at 9 AM on Sep 21
Sunny
59°F
8%
rain
0%
snow
3.6 mph SSW
wind
29.95 inHg
pressure
10 AM Sunny at 10 AM on Sep 21
Sunny
63°F
5%
rain
0%
snow
2.7 mph SW
wind
29.95 inHg
pressure
11 AM Sunny at 11 AM on Sep 21
Sunny
66°F
3%
rain
0%
snow
2.9 mph WNW
wind
29.94 inHg
pressure
12 PM Sunny at 12 PM on Sep 21
Sunny
68°F
3%
rain
0%
snow
5.1 mph WNW
wind
29.93 inHg
pressure
1 PM Sunny at 1 PM on Sep 21
Sunny
68°F
3%
rain
0%
snow
6.5 mph WNW
wind
29.91 inHg
pressure
2 PM Sunny at 2 PM on Sep 21
Sunny
69°F
2%
rain
0%
snow
6.9 mph WNW
wind
29.9 inHg
pressure
3 PM Sunny at 3 PM on Sep 21
Sunny
70°F
2%
rain
0%
snow
6.9 mph WNW
wind
29.88 inHg
pressure
4 PM Sunny at 4 PM on Sep 21
Sunny
68°F
3%
rain
0%
snow
7.6 mph W
wind
29.87 inHg
pressure
5 PM Sunny at 5 PM on Sep 21
Sunny
65°F
4%
rain
0%
snow
7.4 mph W
wind
29.87 inHg
pressure
6 PM Sunny at 6 PM on Sep 21
Sunny
64°F
5%
rain
0%
snow
6.5 mph W
wind
29.88 inHg
pressure
7 PM Sunny at 7 PM on Sep 21
Sunny
59°F
11%
rain
0%
snow
5.8 mph WSW
wind
29.89 inHg
pressure
8 PM Partly Cloudy at 8 PM on Sep 21
Partly Cloudy
57°F
16%
rain
0%
snow
5.4 mph SW
wind
29.92 inHg
pressure
9 PM Partly Cloudy at 9 PM on Sep 21
Partly Cloudy
57°F
17%
rain
0%
snow
5.4 mph SW
wind
29.91 inHg
pressure
10 PM Partly Cloudy at 10 PM on Sep 21
Partly Cloudy
56°F
16%
rain
0%
snow
5.1 mph SW
wind
29.92 inHg
pressure
11 PM Clear at 11 PM on Sep 21
Clear
56°F
15%
rain
0%
snow
4.5 mph SW
wind
29.92 inHg
pressure
9-22

Sunny

Tue 9-22

Sunny with a high of 73°F and a low of 56°F. There's a very small chance of rainfall, only about 8%. Winds will be light at 8mph and gusts of 14.8mph at 11 AM. The humidity will be on the higher side, averaging about 71%, the maximum being 92% at 12 AM and 48% being its lowest at 12 PM. Barometric pressure is its highest of 29.92inHg at 8 AM, a lowest point of 29.82inHg at 5 PM with an avg 29.88inHg.

    • HI: 73°F
    • LO: 56°F
    • Rain: 8%
    • Snow: 0%
    • Wind
      7.8 mph
    • Humidity
      71% avg.
    • UV Index
      6
    • Air Quality
      Good
    • Sunrise
      06:56 AM
    • Sunset
      07:06 PM
    • Moonrise
      05:22 PM
    • Moonset
      03:07 AM
    • Moon Phase
      Waxing Gibbous
  • Hourly
12 AM Clear at 12 AM on Sep 22
Clear
56°F
15%
rain
0%
snow
4.9 mph SW
wind
29.9 inHg
pressure
1 AM Clear at 1 AM on Sep 22
Clear
57°F
14%
rain
0%
snow
4.5 mph SW
wind
29.9 inHg
pressure
2 AM Clear at 2 AM on Sep 22
Clear
57°F
12%
rain
0%
snow
4.9 mph SSW
wind
29.9 inHg
pressure
3 AM Clear at 3 AM on Sep 22
Clear
57°F
13%
rain
0%
snow
4 mph SSW
wind
29.89 inHg
pressure
4 AM Clear at 4 AM on Sep 22
Clear
57°F
13%
rain
0%
snow
3.8 mph SSW
wind
29.89 inHg
pressure
5 AM Clear at 5 AM on Sep 22
Clear
57°F
11%
rain
0%
snow
3.8 mph SW
wind
29.89 inHg
pressure
6 AM Clear at 6 AM on Sep 22
Clear
57°F
13%
rain
0%
snow
3.6 mph SW
wind
29.89 inHg
pressure
7 AM Sunny at 7 AM on Sep 22
Sunny
57°F
13%
rain
0%
snow
3.4 mph SW
wind
29.9 inHg
pressure
8 AM Sunny at 8 AM on Sep 22
Sunny
59°F
7%
rain
0%
snow
2.5 mph SW
wind
29.92 inHg
pressure
9 AM Sunny at 9 AM on Sep 22
Sunny
61°F
7%
rain
0%
snow
2.5 mph W
wind
29.92 inHg
pressure
10 AM Sunny at 10 AM on Sep 22
Sunny
66°F
4%
rain
0%
snow
1.1 mph NW
wind
29.92 inHg
pressure
11 AM Sunny at 11 AM on Sep 22
Sunny
69°F
2%
rain
0%
snow
3.6 mph NNW
wind
29.91 inHg
pressure
12 PM Sunny at 12 PM on Sep 22
Sunny
71°F
2%
rain
0%
snow
4.9 mph NNW
wind
29.9 inHg
pressure
1 PM Sunny at 1 PM on Sep 22
Sunny
72°F
2%
rain
0%
snow
6.5 mph NNW
wind
29.88 inHg
pressure
2 PM Sunny at 2 PM on Sep 22
Sunny
73°F
2%
rain
0%
snow
7.8 mph NW
wind
29.87 inHg
pressure
3 PM Overcast at 3 PM on Sep 22
Overcast
73°F
4%
rain
0%
snow
7.4 mph NW
wind
29.85 inHg
pressure
4 PM Sunny at 4 PM on Sep 22
Sunny
73°F
7%
rain
0%
snow
6.7 mph WNW
wind
29.84 inHg
pressure
5 PM Overcast at 5 PM on Sep 22
Overcast
73°F
12%
rain
0%
snow
6.3 mph WNW
wind
29.82 inHg
pressure
6 PM Overcast at 6 PM on Sep 22
Overcast
70°F
14%
rain
0%
snow
5.8 mph W
wind
29.83 inHg
pressure
7 PM Overcast at 7 PM on Sep 22
Overcast
67°F
17%
rain
0%
snow
5.1 mph W
wind
29.84 inHg
pressure
8 PM Overcast at 8 PM on Sep 22
Overcast
64°F
22%
rain
0%
snow
4.7 mph WSW
wind
29.85 inHg
pressure
9 PM Overcast at 9 PM on Sep 22
Overcast
63°F
21%
rain
0%
snow
4.7 mph WSW
wind
29.85 inHg
pressure
10 PM Overcast at 10 PM on Sep 22
Overcast
63°F
21%
rain
0%
snow
4.5 mph WSW
wind
29.86 inHg
pressure
11 PM Overcast at 11 PM on Sep 22
Overcast
62°F
21%
rain
0%
snow
4.5 mph WSW
wind
29.87 inHg
pressure
9-23

Overcast

Wed 9-23

Overcast with a high of 81°F and a low of 62°F. There might be light rainfall having a 13% chance. Winds will be light at 8mph and gusts of 13.4mph at 11 AM. Humidity levels should be comfortable, sitting around 57% on average, the maximum being 75% at 12 AM and 37% being its lowest at 2 PM. Barometric pressure is its highest of 29.88inHg at 11 AM, a lowest point of 29.83inHg at 5 PM with an avg 29.86inHg.

    • HI: 81°F
    • LO: 62°F
    • Rain: 13%
    • Snow: 0%
    • Wind
      7.2 mph
    • Humidity
      57% avg.
    • UV Index
      6
    • Air Quality
      TBA
    • Sunrise
      06:57 AM
    • Sunset
      07:04 PM
    • Moonrise
      05:46 PM
    • Moonset
      04:07 AM
    • Moon Phase
      Waxing Gibbous
  • Hourly
12 AM Overcast at 12 AM on Sep 23
Overcast
62°F
20%
rain
0%
snow
4.3 mph SW
wind
29.86 inHg
pressure
1 AM Overcast at 1 AM on Sep 23
Overcast
62°F
20%
rain
0%
snow
3.8 mph SW
wind
29.86 inHg
pressure
2 AM Overcast at 2 AM on Sep 23
Overcast
62°F
19%
rain
0%
snow
3.6 mph SW
wind
29.86 inHg
pressure
3 AM Overcast at 3 AM on Sep 23
Overcast
62°F
20%
rain
0%
snow
3.1 mph SW
wind
29.85 inHg
pressure
4 AM Overcast at 4 AM on Sep 23
Overcast
62°F
20%
rain
0%
snow
2.9 mph SW
wind
29.85 inHg
pressure
5 AM Overcast at 5 AM on Sep 23
Overcast
62°F
20%
rain
0%
snow
2.5 mph SSW
wind
29.86 inHg
pressure
6 AM Overcast at 6 AM on Sep 23
Overcast
63°F
18%
rain
0%
snow
2 mph S
wind
29.86 inHg
pressure
7 AM Overcast at 7 AM on Sep 23
Overcast
64°F
17%
rain
0%
snow
1.8 mph SSE
wind
29.87 inHg
pressure
8 AM Overcast at 8 AM on Sep 23
Overcast
66°F
15%
rain
0%
snow
1.3 mph SE
wind
29.88 inHg
pressure
9 AM Cloudy at 9 AM on Sep 23
Cloudy
68°F
12%
rain
0%
snow
2.5 mph SSW
wind
29.88 inHg
pressure
10 AM Overcast at 10 AM on Sep 23
Overcast
71°F
10%
rain
0%
snow
3.4 mph W
wind
29.88 inHg
pressure
11 AM Cloudy at 11 AM on Sep 23
Cloudy
74°F
8%
rain
0%
snow
4.5 mph NNW
wind
29.88 inHg
pressure
12 PM Overcast at 12 PM on Sep 23
Overcast
76°F
8%
rain
0%
snow
5.4 mph NNW
wind
29.87 inHg
pressure
1 PM Cloudy at 1 PM on Sep 23
Cloudy
79°F
9%
rain
0%
snow
6 mph NW
wind
29.85 inHg
pressure
2 PM Overcast at 2 PM on Sep 23
Overcast
81°F
9%
rain
0%
snow
6.9 mph NW
wind
29.84 inHg
pressure
3 PM Overcast at 3 PM on Sep 23
Overcast
80°F
9%
rain
0%
snow
6.9 mph WNW
wind
29.83 inHg
pressure
4 PM Overcast at 4 PM on Sep 23
Overcast
79°F
10%
rain
0%
snow
7.2 mph WNW
wind
29.83 inHg
pressure
5 PM Overcast at 5 PM on Sep 23
Overcast
78°F
10%
rain
0%
snow
7.2 mph W
wind
29.83 inHg
pressure
6 PM Overcast at 6 PM on Sep 23
Overcast
74°F
11%
rain
0%
snow
6.3 mph W
wind
29.84 inHg
pressure
7 PM Overcast at 7 PM on Sep 23
Overcast
70°F
12%
rain
0%
snow
5.1 mph W
wind
29.85 inHg
pressure
8 PM Overcast at 8 PM on Sep 23
Overcast
67°F
14%
rain
0%
snow
4.3 mph WSW
wind
29.86 inHg
pressure
9 PM Overcast at 9 PM on Sep 23
Overcast
66°F
14%
rain
0%
snow
3.4 mph WSW
wind
29.86 inHg
pressure
10 PM Overcast at 10 PM on Sep 23
Overcast
66°F
14%
rain
0%
snow
2.5 mph WSW
wind
29.87 inHg
pressure
11 PM Overcast at 11 PM on Sep 23
Overcast
66°F
14%
rain
0%
snow
1.6 mph SW
wind
29.87 inHg
pressure
9-24

Overcast

Thu 9-24

Overcast with a high of 75°F and a low of 58°F. There's a very small chance of rainfall, only about 10%. Winds will be light at 8mph and gusts of 14.3mph at 11 PM. Humidity levels should be comfortable, sitting around 58% on average, the maximum being 81% at 11 PM and 40% being its lowest at 2 PM. Barometric pressure is its highest of 29.9inHg at 10 PM, a lowest point of 29.84inHg at 5 PM with an avg 29.87inHg.

    • HI: 75°F
    • LO: 58°F
    • Rain: 10%
    • Snow: 0%
    • Wind
      7.6 mph
    • Humidity
      58% avg.
    • UV Index
      6
    • Air Quality
      TBA
    • Sunrise
      06:58 AM
    • Sunset
      07:03 PM
    • Moonrise
      06:09 PM
    • Moonset
      05:06 AM
    • Moon Phase
      Full Moon
  • Hourly
12 AM Overcast at 12 AM on Sep 24
Overcast
66°F
14%
rain
0%
snow
1.3 mph W
wind
29.87 inHg
pressure
1 AM Overcast at 1 AM on Sep 24
Overcast
65°F
14%
rain
0%
snow
0.9 mph WNW
wind
29.86 inHg
pressure
2 AM Overcast at 2 AM on Sep 24
Overcast
65°F
14%
rain
0%
snow
0.7 mph NNW
wind
29.85 inHg
pressure
3 AM Overcast at 3 AM on Sep 24
Overcast
64°F
15%
rain
0%
snow
1.8 mph NW
wind
29.85 inHg
pressure
4 AM Overcast at 4 AM on Sep 24
Overcast
63°F
16%
rain
0%
snow
2.7 mph WNW
wind
29.86 inHg
pressure
5 AM Overcast at 5 AM on Sep 24
Overcast
62°F
18%
rain
0%
snow
3.8 mph W
wind
29.86 inHg
pressure
6 AM Overcast at 6 AM on Sep 24
Overcast
63°F
16%
rain
0%
snow
3.4 mph WSW
wind
29.87 inHg
pressure
7 AM Overcast at 7 AM on Sep 24
Overcast
64°F
15%
rain
0%
snow
2.7 mph WSW
wind
29.87 inHg
pressure
8 AM Overcast at 8 AM on Sep 24
Overcast
64°F
14%
rain
0%
snow
2.2 mph SW
wind
29.88 inHg
pressure
9 AM Partly Cloudy at 9 AM on Sep 24
Partly Cloudy
67°F
10%
rain
0%
snow
3.1 mph WSW
wind
29.88 inHg
pressure
10 AM Overcast at 10 AM on Sep 24
Overcast
70°F
7%
rain
0%
snow
3.8 mph W
wind
29.88 inHg
pressure
11 AM Partly Cloudy at 11 AM on Sep 24
Partly Cloudy
73°F
5%
rain
0%
snow
4.7 mph WNW
wind
29.89 inHg
pressure
12 PM Overcast at 12 PM on Sep 24
Overcast
73°F
6%
rain
0%
snow
5.6 mph WNW
wind
29.88 inHg
pressure
1 PM Partly Cloudy at 1 PM on Sep 24
Partly Cloudy
74°F
8%
rain
0%
snow
6.7 mph WNW
wind
29.87 inHg
pressure
2 PM Overcast at 2 PM on Sep 24
Overcast
75°F
10%
rain
0%
snow
7.6 mph W
wind
29.86 inHg
pressure
3 PM Overcast at 3 PM on Sep 24
Overcast
73°F
10%
rain
0%
snow
7.6 mph W
wind
29.85 inHg
pressure
4 PM Overcast at 4 PM on Sep 24
Overcast
71°F
11%
rain
0%
snow
7.6 mph W
wind
29.85 inHg
pressure
5 PM Overcast at 5 PM on Sep 24
Overcast
69°F
11%
rain
0%
snow
7.6 mph W
wind
29.84 inHg
pressure
6 PM Sunny at 6 PM on Sep 24
Sunny
66°F
8%
rain
0%
snow
6.9 mph W
wind
29.86 inHg
pressure
7 PM Overcast at 7 PM on Sep 24
Overcast
63°F
7%
rain
0%
snow
6.5 mph W
wind
29.87 inHg
pressure
8 PM Clear at 8 PM on Sep 24
Clear
60°F
8%
rain
0%
snow
5.8 mph WSW
wind
29.89 inHg
pressure
9 PM Clear at 9 PM on Sep 24
Clear
59°F
9%
rain
0%
snow
5.6 mph WSW
wind
29.89 inHg
pressure
10 PM Clear at 10 PM on Sep 24
Clear
59°F
9%
rain
0%
snow
5.6 mph WSW
wind
29.9 inHg
pressure
11 PM Clear at 11 PM on Sep 24
Clear
58°F
10%
rain
0%
snow
5.4 mph WSW
wind
29.9 inHg
pressure
9-25

Partly Cloudy

Fri 9-25

Partly Cloudy with a high of 63°F and a low of 55°F. There might be light rainfall having a 11% chance. Wind will be moderate, blowing around 17mph on average and gusts of 21.7mph at 2 PM. The humidity will be on the higher side, averaging about 73%, the maximum being 91% at 2 AM and 49% being its lowest at 2 PM. Barometric pressure is its highest of 30.06inHg at 11 PM, a lowest point of 29.91inHg at 12 AM with an avg 29.99inHg.

    • HI: 63°F
    • LO: 55°F
    • Rain: 11%
    • Snow: 0%
    • Wind
      16.8 mph
    • Humidity
      73% avg.
    • UV Index
      5
    • Air Quality
      TBA
    • Sunrise
      06:59 AM
    • Sunset
      07:01 PM
    • Moonrise
      06:31 PM
    • Moonset
      06:05 AM
    • Moon Phase
      Full Moon
  • Hourly
12 AM Partly Cloudy at 12 AM on Sep 25
Partly Cloudy
58°F
12%
rain
0%
snow
5.1 mph WSW
wind
29.91 inHg
pressure
1 AM Clear at 1 AM on Sep 25
Clear
57°F
14%
rain
0%
snow
5.1 mph WSW
wind
29.93 inHg
pressure
2 AM Partly Cloudy at 2 AM on Sep 25
Partly Cloudy
57°F
17%
rain
0%
snow
4.9 mph SW
wind
29.94 inHg
pressure
3 AM Overcast at 3 AM on Sep 25
Overcast
57°F
19%
rain
0%
snow
5.6 mph WSW
wind
29.94 inHg
pressure
4 AM Partly Cloudy at 4 AM on Sep 25
Partly Cloudy
57°F
22%
rain
0%
snow
6.3 mph WSW
wind
29.94 inHg
pressure
5 AM Overcast at 5 AM on Sep 25
Overcast
58°F
26%
rain
0%
snow
6.9 mph W
wind
29.94 inHg
pressure
6 AM Overcast at 6 AM on Sep 25
Overcast
57°F
27%
rain
0%
snow
6.9 mph W
wind
29.95 inHg
pressure
7 AM Overcast at 7 AM on Sep 25
Overcast
57°F
27%
rain
0%
snow
6.9 mph W
wind
29.96 inHg
pressure
8 AM Overcast at 8 AM on Sep 25
Overcast
57°F
28%
rain
0%
snow
6.9 mph W
wind
29.97 inHg
pressure
9 AM Sunny at 9 AM on Sep 25
Sunny
58°F
16%
rain
0%
snow
9.2 mph W
wind
29.98 inHg
pressure
10 AM Overcast at 10 AM on Sep 25
Overcast
60°F
8%
rain
0%
snow
11.2 mph W
wind
29.99 inHg
pressure
11 AM Sunny at 11 AM on Sep 25
Sunny
62°F
3%
rain
0%
snow
13.4 mph WNW
wind
30 inHg
pressure
12 PM Partly Cloudy at 12 PM on Sep 25
Partly Cloudy
62°F
4%
rain
0%
snow
14.5 mph WNW
wind
30 inHg
pressure
1 PM Sunny at 1 PM on Sep 25
Sunny
63°F
4%
rain
0%
snow
15.7 mph WNW
wind
30 inHg
pressure
2 PM Partly Cloudy at 2 PM on Sep 25
Partly Cloudy
63°F
5%
rain
0%
snow
16.8 mph WNW
wind
30 inHg
pressure
3 PM Sunny at 3 PM on Sep 25
Sunny
62°F
4%
rain
0%
snow
16.1 mph WNW
wind
30 inHg
pressure
4 PM Partly Cloudy at 4 PM on Sep 25
Partly Cloudy
62°F
3%
rain
0%
snow
15.2 mph WNW
wind
30 inHg
pressure
5 PM Sunny at 5 PM on Sep 25
Sunny
61°F
3%
rain
0%
snow
14.5 mph WNW
wind
30 inHg
pressure
6 PM Partly Cloudy at 6 PM on Sep 25
Partly Cloudy
59°F
5%
rain
0%
snow
13.6 mph WNW
wind
30.01 inHg
pressure
7 PM Sunny at 7 PM on Sep 25
Sunny
57°F
9%
rain
0%
snow
12.5 mph WNW
wind
30.02 inHg
pressure
8 PM Partly Cloudy at 8 PM on Sep 25
Partly Cloudy
55°F
14%
rain
0%
snow
11.6 mph WNW
wind
30.03 inHg
pressure
9 PM Overcast at 9 PM on Sep 25
Overcast
55°F
16%
rain
0%
snow
11 mph WNW
wind
30.04 inHg
pressure
10 PM Partly Cloudy at 10 PM on Sep 25
Partly Cloudy
55°F
19%
rain
0%
snow
10.1 mph WNW
wind
30.05 inHg
pressure
11 PM Overcast at 11 PM on Sep 25
Overcast
55°F
23%
rain
0%
snow
9.4 mph WNW
wind
30.06 inHg
pressure
9-26

Sunny

Sat 9-26

Sunny with a high of 64°F and a low of 54°F. There's a very small chance of rainfall, only about 9%. Wind will be moderate, blowing around 15mph on average and gusts of 18.4mph at 5 PM. The humidity will be on the higher side, averaging about 74%, the maximum being 87% at 5 AM and 50% being its lowest at 2 PM. Barometric pressure is its highest of 30.08inHg at 11 AM, a lowest point of 29.99inHg at 5 PM with an avg 30.04inHg.

    • HI: 64°F
    • LO: 54°F
    • Rain: 9%
    • Snow: 0%
    • Wind
      14.3 mph
    • Humidity
      74% avg.
    • UV Index
      5
    • Air Quality
      TBA
    • Sunrise
      07:00 AM
    • Sunset
      07:00 PM
    • Moonrise
      06:53 PM
    • Moonset
      07:05 AM
    • Moon Phase
      Full Moon
  • Hourly
12 AM Partly Cloudy at 12 AM on Sep 26
Partly Cloudy
55°F
21%
rain
0%
snow
8.5 mph W
wind
30.06 inHg
pressure
1 AM Overcast at 1 AM on Sep 26
Overcast
55°F
19%
rain
0%
snow
7.6 mph W
wind
30.06 inHg
pressure
2 AM Partly Cloudy at 2 AM on Sep 26
Partly Cloudy
54°F
17%
rain
0%
snow
6.7 mph W
wind
30.05 inHg
pressure
3 AM Overcast at 3 AM on Sep 26
Overcast
54°F
20%
rain
0%
snow
6.7 mph W
wind
30.05 inHg
pressure
4 AM Partly Cloudy at 4 AM on Sep 26
Partly Cloudy
54°F
24%
rain
0%
snow
6.5 mph W
wind
30.04 inHg
pressure
5 AM Overcast at 5 AM on Sep 26
Overcast
54°F
28%
rain
0%
snow
6.5 mph W
wind
30.04 inHg
pressure
6 AM Clear at 6 AM on Sep 26
Clear
54°F
21%
rain
0%
snow
6.5 mph W
wind
30.05 inHg
pressure
7 AM Overcast at 7 AM on Sep 26
Overcast
54°F
16%
rain
0%
snow
6.3 mph W
wind
30.05 inHg
pressure
8 AM Sunny at 8 AM on Sep 26
Sunny
54°F
12%
rain
0%
snow
6.3 mph W
wind
30.06 inHg
pressure
9 AM Sunny at 9 AM on Sep 26
Sunny
57°F
8%
rain
0%
snow
8.3 mph WNW
wind
30.06 inHg
pressure
10 AM Sunny at 10 AM on Sep 26
Sunny
59°F
5%
rain
0%
snow
10.5 mph WNW
wind
30.07 inHg
pressure
11 AM Sunny at 11 AM on Sep 26
Sunny
61°F
4%
rain
0%
snow
12.5 mph WNW
wind
30.08 inHg
pressure
12 PM Sunny at 12 PM on Sep 26
Sunny
62°F
3%
rain
0%
snow
12.8 mph WNW
wind
30.06 inHg
pressure
1 PM Sunny at 1 PM on Sep 26
Sunny
63°F
2%
rain
0%
snow
13 mph WNW
wind
30.05 inHg
pressure
2 PM Sunny at 2 PM on Sep 26
Sunny
64°F
2%
rain
0%
snow
13.2 mph WNW
wind
30.04 inHg
pressure
3 PM Sunny at 3 PM on Sep 26
Sunny
63°F
2%
rain
0%
snow
13.6 mph WNW
wind
30.02 inHg
pressure
4 PM Sunny at 4 PM on Sep 26
Sunny
62°F
3%
rain
0%
snow
13.9 mph WNW
wind
30.01 inHg
pressure
5 PM Sunny at 5 PM on Sep 26
Sunny
61°F
3%
rain
0%
snow
14.3 mph WNW
wind
29.99 inHg
pressure
6 PM Sunny at 6 PM on Sep 26
Sunny
60°F
4%
rain
0%
snow
13 mph WNW
wind
30 inHg
pressure
7 PM Clear at 7 PM on Sep 26
Clear
58°F
7%
rain
0%
snow
11.4 mph W
wind
30 inHg
pressure
8 PM Clear at 8 PM on Sep 26
Clear
56°F
10%
rain
0%
snow
10.1 mph W
wind
30 inHg
pressure
9 PM Clear at 9 PM on Sep 26
Clear
56°F
11%
rain
0%
snow
9.2 mph W
wind
30.01 inHg
pressure
10 PM Clear at 10 PM on Sep 26
Clear
56°F
11%
rain
0%
snow
8.5 mph W
wind
30 inHg
pressure
11 PM Clear at 11 PM on Sep 26
Clear
56°F
12%
rain
0%
snow
7.6 mph W
wind
30 inHg
pressure
9-27

Sunny

Sun 9-27

Sunny with a high of 65°F and a low of 56°F. There might be light rainfall having a 12% chance. Wind will be moderate, blowing around 15mph on average and gusts of 18.4mph at 5 PM. The humidity will be on the higher side, averaging about 78%, the maximum being 91% at 3 AM and 56% being its lowest at 2 PM. Barometric pressure is its highest of 29.99inHg at 12 AM, a lowest point of 29.82inHg at 11 PM with an avg 29.91inHg.

    • HI: 65°F
    • LO: 56°F
    • Rain: 12%
    • Snow: 0%
    • Wind
      14.5 mph
    • Humidity
      78% avg.
    • UV Index
      5
    • Air Quality
      TBA
    • Sunrise
      07:01 AM
    • Sunset
      06:58 PM
    • Moonrise
      07:18 PM
    • Moonset
      08:06 AM
    • Moon Phase
      Waning Gibbous
  • Hourly
12 AM Clear at 12 AM on Sep 27
Clear
56°F
13%
rain
0%
snow
7.8 mph W
wind
29.99 inHg
pressure
1 AM Clear at 1 AM on Sep 27
Clear
56°F
14%
rain
0%
snow
8.1 mph W
wind
29.98 inHg
pressure
2 AM Clear at 2 AM on Sep 27
Clear
56°F
15%
rain
0%
snow
8.3 mph WNW
wind
29.98 inHg
pressure
3 AM Partly Cloudy at 3 AM on Sep 27
Partly Cloudy
57°F
16%
rain
0%
snow
7.4 mph W
wind
29.97 inHg
pressure
4 AM Clear at 4 AM on Sep 27
Clear
57°F
18%
rain
0%
snow
6.7 mph W
wind
29.96 inHg
pressure
5 AM Partly Cloudy at 5 AM on Sep 27
Partly Cloudy
57°F
20%
rain
0%
snow
5.8 mph W
wind
29.96 inHg
pressure
6 AM Overcast at 6 AM on Sep 27
Overcast
57°F
21%
rain
0%
snow
6 mph W
wind
29.96 inHg
pressure
7 AM Partly Cloudy at 7 AM on Sep 27
Partly Cloudy
57°F
23%
rain
0%
snow
6.3 mph W
wind
29.96 inHg
pressure
8 AM Overcast at 8 AM on Sep 27
Overcast
57°F
25%
rain
0%
snow
6.5 mph W
wind
29.96 inHg
pressure
9 AM Sunny at 9 AM on Sep 27
Sunny
59°F
15%
rain
0%
snow
6.5 mph WNW
wind
29.95 inHg
pressure
10 AM Overcast at 10 AM on Sep 27
Overcast
61°F
8%
rain
0%
snow
6.3 mph WNW
wind
29.95 inHg
pressure
11 AM Sunny at 11 AM on Sep 27
Sunny
63°F
4%
rain
0%
snow
6.3 mph WNW
wind
29.94 inHg
pressure
12 PM Cloudy at 12 PM on Sep 27
Cloudy
64°F
5%
rain
0%
snow
7.6 mph WNW
wind
29.92 inHg
pressure
1 PM Sunny at 1 PM on Sep 27
Sunny
64°F
8%
rain
0%
snow
8.9 mph NW
wind
29.91 inHg
pressure
2 PM Cloudy at 2 PM on Sep 27
Cloudy
65°F
11%
rain
0%
snow
10.3 mph NW
wind
29.89 inHg
pressure
3 PM Sunny at 3 PM on Sep 27
Sunny
64°F
8%
rain
0%
snow
11.6 mph WNW
wind
29.88 inHg
pressure
4 PM Cloudy at 4 PM on Sep 27
Cloudy
63°F
5%
rain
0%
snow
13.2 mph WNW
wind
29.86 inHg
pressure
5 PM Sunny at 5 PM on Sep 27
Sunny
62°F
4%
rain
0%
snow
14.5 mph W
wind
29.85 inHg
pressure
6 PM Partly Cloudy at 6 PM on Sep 27
Partly Cloudy
60°F
7%
rain
0%
snow
12.1 mph W
wind
29.85 inHg
pressure
7 PM Clear at 7 PM on Sep 27
Clear
58°F
11%
rain
0%
snow
9.4 mph W
wind
29.85 inHg
pressure
8 PM Partly Cloudy at 8 PM on Sep 27
Partly Cloudy
56°F
16%
rain
0%
snow
6.9 mph WSW
wind
29.85 inHg
pressure
9 PM Partly Cloudy at 9 PM on Sep 27
Partly Cloudy
56°F
17%
rain
0%
snow
6.5 mph WSW
wind
29.84 inHg
pressure
10 PM Partly Cloudy at 10 PM on Sep 27
Partly Cloudy
56°F
18%
rain
0%
snow
6.3 mph WSW
wind
29.83 inHg
pressure
11 PM Partly Cloudy at 11 PM on Sep 27
Partly Cloudy
56°F
19%
rain
0%
snow
5.8 mph WSW
wind
29.82 inHg
pressure

This 10-Day weather forecast is valid for ZIP code 94028, accurately covering the area of Portola Valley, CA.

Currently

Clear 58°F
30.08 inHg.
Barometer
89%
Humidity
SW 4.7 mph
Wind
Clear
Full Report

National Outlook

More Flash Flooding Expected in the Southwest and Plains: 09-17 to 09-19

Thu Sep 17th 2026, 5:06am PDT
Read

Weather Forecast Nearby

Los Altos, CA
Atherton, CA
Palo Alto, CA
Mountain View, CA
Loma Mar, CA
California

More Local Information

Portola Valley, CA Weather
Portola Valley, CA Hourly Forecast
Portola Valley, CA Weather Alerts
Portola Valley, CA Radar Maps
Portola Valley, CA Traffic
Portola Valley, CA Past Weather
Portola Valley, CA Daily Charts

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