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Portola Valley, CA Weather Forecast | 5 Day
Updated: Wed Jul 9th 2025 12:30 PM PDT
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Partly Cloudy
Wed 7-9
Partly Cloudy with a high of 78°F and a low of 57°F. Winds will be light at 10mph and gusts of 11.1mph at 4 PM. The humidity will be on the higher side, averaging about 69%, the maximum being 72% at 11 PM and 46% being its lowest at 3 PM. Barometric pressure is its highest of 30.13inHg at 1 PM, a lowest point of 30.05inHg at 7 PM with an avg 30.08inHg.
- HI: 78°F
- LO: 57°F
- Rainfall: 0%
- Snowfall: 0%
- Wind
9.6 mph - Humidity
69% avg. - UV Index
2.8 - Air QualityModerate
- Sunrise
05:56 AM - Sunset
08:31 PM - Moonrise
08:14 PM - Moonset
04:25 AM - Moon Phase
Waxing Gibbous

Sunny
Thu 7-10
Sunny with a high of 95°F and a low of 53°F. Winds will be light at 9mph and gusts of 9.3mph at 4 PM. Humidity levels should be comfortable, sitting around 60% on average, the maximum being 90% at 6 AM and 30% being its lowest at 2 PM. Barometric pressure is its highest of 30.05inHg at 12 AM, a lowest point of 29.88inHg at 11 PM with an avg 29.97inHg.
- HI: 95°F
- LO: 53°F
- Rainfall: 0%
- Snowfall: 0%
- Wind
8.1 mph - Humidity
60% avg. - UV Index
2.9 - Air QualityModerate
- Sunrise
05:56 AM - Sunset
08:31 PM - Moonrise
09:00 PM - Moonset
05:25 AM - Moon Phase
Full Moon

Sunny
Fri 7-11
Sunny with a high of 91°F and a low of 55°F. Winds will be light at 7mph and gusts of 8.5mph at 9 PM. Humidity levels should be comfortable, sitting around 59% on average, the maximum being 83% at 5 AM and 35% being its lowest at 2 PM. Barometric pressure is its highest of 29.9inHg at 11 PM, a lowest point of 29.83inHg at 7 PM with an avg 29.86inHg.
- HI: 91°F
- LO: 55°F
- Rainfall: 0%
- Snowfall: 0%
- Wind
6.3 mph - Humidity
59% avg. - UV Index
2.9 - Air QualityModerate
- Sunrise
05:57 AM - Sunset
08:30 PM - Moonrise
09:38 PM - Moonset
06:30 AM - Moon Phase
Waning Gibbous

Sunny
Sat 7-12
Sunny with a high of 88°F and a low of 58°F. Winds will be light at 6mph and gusts of 7.7mph at 1 AM. Humidity levels should be comfortable, sitting around 59% on average, the maximum being 85% at 5 AM and 30% being its lowest at 1 PM. Barometric pressure is its highest of 29.91inHg at 10 AM, a lowest point of 29.81inHg at 4 PM with an avg 29.87inHg.
- HI: 88°F
- LO: 58°F
- Rainfall: 0%
- Snowfall: 0%
- Wind
6 mph - Humidity
59% avg. - UV Index
2.9 - Air QualityModerate
- Sunrise
05:58 AM - Sunset
08:30 PM - Moonrise
10:10 PM - Moonset
07:39 AM - Moon Phase
Waning Gibbous

Sunny
Sun 7-13
Sunny with a high of 86°F and a low of 57°F. Winds will be light at 7mph and gusts of 7.7mph at 6 PM. Humidity levels should be comfortable, sitting around 56% on average, the maximum being 78% at 5 AM and 33% being its lowest at 1 PM. Barometric pressure is its highest of 29.9inHg at 11 PM, a lowest point of 29.83inHg at 4 PM with an avg 29.87inHg.
- HI: 86°F
- LO: 57°F
- Rainfall: 0%
- Snowfall: 0%
- Wind
6.7 mph - Humidity
56% avg. - UV Index
0 - Air QualityModerate
- Sunrise
05:58 AM - Sunset
08:29 PM - Moonrise
10:39 PM - Moonset
08:47 AM - Moon Phase
Waning Gibbous

Sunny
Mon 7-14
Sunny with a high of 87°F and a low of 58°F. Winds will be light at 8mph and gusts of 8.5mph at 2 PM. Humidity levels should be comfortable, sitting around 52% on average, the maximum being 73% at 5 AM and 30% being its lowest at 2 PM. Barometric pressure is its highest of 29.91inHg at 11 PM, a lowest point of 29.83inHg at 5 PM with an avg 29.88inHg.
- HI: 87°F
- LO: 58°F
- Rainfall: 0%
- Snowfall: 0%
- Wind
7.4 mph - Humidity
52% avg. - UV Index
6 - Air QualityTBA
- Sunrise
05:59 AM - Sunset
08:29 PM - Moonrise
11:05 PM - Moonset
09:55 AM - Moon Phase
Waning Gibbous
Currently
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66°F |
30.15 inHg.
Barometer 68%
Humidity NW 11.9 mph Wind |
Sunny |