Portola Valley Weather in July
What's the weather like in Portola Valley (California) in July 2025?
The climate in Portola Valley during July can be summarized as mild and very dry.
July is in the summer in Portola Valley and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 23°C (74°F), whilst at night 12°C (53°F) is normal.
| Daytime temperature | 23.3°C 73.9°F |
|---|---|
| Nightly temperature | 11.7°C 53.1°F |
| Average temperature | 17.5°C 63.5°F |
| Daily sunshine | 11.3 hrs |
| Avg rainfall | 2 mm 0.1 ins |
| Rainy days | 1 days |
| Sea temperature | 13.1°C 55.5°F |
| Humidity | 70% |
| Windspeed | 19.4kph 12 mph |
On average July is the driest month of the year in Portola Valley with around 2mm 0.1 inches of rain making it a very dry time to visit.
On the flip side this corresponds to an average of 11.3 hours of sunshine per day.
July temperatures in Portola Valley
July rainfall
July hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Portola Valley in July 2025.
Other monthly averages
Portola Valley weather stats
| Hottest month: | August | 23.3°C 73.9°F |
|---|---|---|
| Driest month: | July | 2mm 0.1ins |
| Sunniest month: | April | 11.1hrs |
| Coldest month: | January | 13.3°C 55.9°F |
| Wettest month: | January | 133mm 5.2ins |
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