Portola Valley Weather in November

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

November is in the fall / autumn in Portola Valley and is typically the 5th coldest month of the year. Daytime maximum temperatures average around a cool 17°C (62°F), whilst at night 7°C (44°F) is normal.

On average November is the 5th wettest month of the year in Portola Valley with around 92mm 3.6 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.

On the flip side this corresponds to an average of 6.5 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 November 2025.