Portola Valley Weather in April

The climate in Portola Valley during April can be summarized as mild and reasonably dry.

April is in the spring in Portola Valley and is typically the 6th coldest month of the year. Daytime maximum temperatures average around a cool 18°C (64°F), whilst at night 7°C (45°F) is normal.

On average April is the 6th wettest month of the year in Portola Valley with around 45mm 1.8 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 6 days, although this may vary considerably.

On the flip side this corresponds to an average of 11.1 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 April 2025.