Portola Valley, CA has a pleasant Mediterranean climate characterized by mild temperatures and moderate rainfall throughout the year. Summers in Portola Valley are generally warm and dry, with average high temperatures in the mid-70s Fahrenheit. Winters tend to be cool and moist, with average low temperatures in the upper 40s Fahrenheit. In terms of precipitation, winters are wetter than summers, but rainfall is moderate all year round. Additionally, Portola Valley enjoys its fair share of sunshine throughout each season.
Portola Valley, California gets 31 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Portola Valley averages 0 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 262 sunny days per year in Portola Valley. The US average is 205 sunny days.
Portola Valley gets some kind of precipitation, on average, 73 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Weather Highlights
Summer High: the July high is around 77 degrees
Winter Low: the January low is 41
Rain: averages 31 inches of rain a year
Snow: averages 0 inches of snow a year