Portola Valley Weather in May

What's the weather like in Portola Valley (California) in May 2025?

The climate in Portola Valley during May can be summarized as mild and very dry.

May is in the spring in Portola Valley and is typically the 6th warmest month of the year. Daytime maximum temperatures average around 20°C (67°F), whilst at night 9°C (48°F) is normal.

Portola Valley weather averages (imperial / metric)
Daytime temperature 19.6°C 67.3°F
Nightly temperature 8.8°C 47.8°F
Average temperature 14.2°C 57.6°F
Daily sunshine 11.5 hrs
Avg rainfall 9 mm 0.4 ins
Rainy days 3 days
Sea temperature 11.8°C 53.2°F
Humidity 69%
Windspeed 20.2kph 13 mph

On average May is the 5th driest month of the year in Portola Valley with around 9mm 0.4 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 11.5 hours of sunshine per day.

May temperatures in Portola Valley

Portola Valley average temperature in May

May rainfall

Portola Valley average rain in May

May hourly sunshine

Portola Valley average rain in May

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 May 2025.

Other monthly averages

Best places to visit in May

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Portola Valley weather stats

Portola Valley weather statistics
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
Map showing location of Portola Valley (37.38411, -122.23524) Portola Valley map pin © Google

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