Portola Valley Hourly Weather Forecast
Next 48 Hours
Ask About Weather
Test our newly developed Weather Chatbot. It provides up to 10 days of forecast information!Fri, Sep 18th 2026
Starting off Sunny skies, turning Clear conditions later in the day. Warming trend from 57°F to 72°. Light winds, shifting from SW to SW at 5.7 mph, with humidity levels between 47% to 92%, and an avg barometric pressure of 30.07 inHg.
Temp
Feel
Humidity
Wind
Pressure
Dew Point
UV
Precip.
4 AM
58°F
57°F
89%
2.9 SW
30.08
54°F
0
13%
5 AM
57°F
57°F
89%
2.9 SW
30.09
54°F
0
13%
6 AM
57°F
57°F
90%
3.1 WSW
30.1
54°F
0
13%
7 AM
57°F
57°F
91%
2.9 SW
30.11
55°F
0
14%
8 AM
58°F
57°F
87%
2.7 WSW
30.12
54°F
0.3
12%
9 AM
61°F
61°F
76%
2.9 W
30.12
54°F
1.1
8%
10 AM
65°F
63°F
68%
4.3 NW
30.12
54°F
2.6
5%
11 AM
67°F
65°F
62%
5.8 NW
30.11
53°F
4.5
4%
12 PM
68°F
66°F
58%
6.9 NNW
30.1
53°F
6.1
3%
1 PM
70°F
66°F
54%
7.8 NW
30.08
52°F
6.9
2%
2 PM
72°F
67°F
49%
8.7 NW
30.06
51°F
6.5
2%
3 PM
72°F
68°F
47%
8.3 NW
30.04
51°F
5.1
1%
4 PM
72°F
67°F
47%
9.2 WNW
30.03
51°F
3.2
1%
5 PM
71°F
66°F
48%
8.1 WNW
30.01
50°F
1.5
2%
6 PM
68°F
64°F
54%
7.8 W
30.01
51°F
0.5
2%
7 PM
63°F
61°F
73%
6.9 WSW
30.01
55°F
0
7%
8 PM
60°F
59°F
86%
6 WSW
30.03
56°F
0
13%
9 PM
59°F
57°F
89%
5.6 SW
30.04
55°F
0
15%
10 PM
58°F
57°F
91%
5.4 SW
30.04
55°F
0
17%
11 PM
58°F
56°F
92%
5.8 SW
30.02
55°F
0
18%
Sat, Sep 19th 2026
Sunny skies giving way to partly cloudy by evening. Warming trend from 55°F to 72°. Light winds, shifting from SW to WSW at 5.4 mph, with humidity ranging 50% to 93%, and an avg barometric pressure of 29.97 inHg.
Temp
Feel
Humidity
Wind
Pressure
Dew Point
UV
Precip.
12 AM
57°F
55°F
93%
5.8 SW
30.02
55°F
0
19%
1 AM
56°F
55°F
93%
5.1 SW
30.01
54°F
0
20%
2 AM
56°F
54°F
93%
5.4 SW
30.01
54°F
0
20%
3 AM
56°F
54°F
93%
4.7 SW
30
54°F
0
20%
4 AM
55°F
54°F
93%
4.7 SW
30
53°F
0
19%
5 AM
56°F
55°F
92%
4 SW
30
53°F
0
17%
6 AM
56°F
55°F
91%
3.8 SW
29.99
53°F
0
17%
7 AM
56°F
55°F
91%
3.6 SW
30
53°F
0
16%
8 AM
56°F
56°F
87%
2.9 SW
30
53°F
0.3
12%
9 AM
61°F
60°F
74%
2.2 SW
30
52°F
1.2
7%
10 AM
66°F
66°F
62%
1.1 W
30
52°F
2.8
4%
11 AM
69°F
68°F
53%
2.9 NNW
29.99
52°F
4.7
2%
12 PM
70°F
67°F
54%
5.8 NW
29.97
52°F
6.4
2%
1 PM
71°F
68°F
52%
7.2 NW
29.95
53°F
7.2
2%
2 PM
72°F
69°F
51%
7.8 WNW
29.94
53°F
6.7
2%
3 PM
72°F
69°F
50%
8.1 WNW
29.93
53°F
5.3
2%
4 PM
70°F
66°F
54%
8.7 WNW
29.92
53°F
3.3
3%
5 PM
67°F
64°F
58%
8.1 W
29.92
52°F
1.5
3%
6 PM
64°F
60°F
66%
7.4 W
29.93
52°F
0.4
9%
7 PM
59°F
57°F
82%
6.3 WSW
29.94
54°F
0
18%
8 PM
58°F
56°F
87%
6 WSW
29.95
54°F
0
25%
9 PM
57°F
55°F
88%
6.3 WSW
29.96
54°F
0
24%
10 PM
57°F
55°F
89%
5.6 WSW
29.96
53°F
0
17%
11 PM
56°F
54°F
90%
5.8 WSW
29.96
53°F
0
18%
Sun, Sep 20th 2026
Partly cloudy expected later. Temps range from 55° to 56°. Light winds from the SW at 5.1 mph, while humidity around 91%, and an avg barometric pressure of 29.94 inHg.
Temp
Feel
Humidity
Wind
Pressure
Dew Point
UV
Precip.
12 AM
56°F
54°F
91%
5.4 WSW
29.95
53°F
0
19%
1 AM
55°F
53°F
91%
5.6 SW
29.95
53°F
0
18%
2 AM
55°F
54°F
91%
4.7 SW
29.94
53°F
0
17%
3 AM
55°F
54°F
91%
4.7 SW
29.93
53°F
0
15%
This hour by hour weather report is valid for ZIP code 94028, accurately covering the area of Portola Valley, CA.
Currently
|
58°F |
30.09 inHg.
Barometer 89%
Humidity SW 2.9mph Wind |
| Clear | ||
National Outlook
More Flash Flooding Expected in the Southwest and Plains: 09-17 to 09-19
Thu Sep 17th 2026, 5:06am PDT
Read
Hourly Weather Nearby
More Local Information
Bookmark and Share
