Portola Valley Weather in March

The climate in Portola Valley during March can be summarized as mild and a little damp.

March is in the spring in Portola Valley and is typically the 4th coldest month of the year. Daytime maximum temperatures average around a cool 16°C (61°F), whilst at night 6°C (43°F) is normal.

On average March is the 4th wettest month of the year in Portola Valley with around 98mm 3.9 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.3 hours of sunshine per day.

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 March 2025.