Foster City, California gets 19 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Foster City 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 Foster City. The US average is 205 sunny days.
Foster City gets some kind of precipitation, on average, 62 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.
Summer High: the July high is around 78 degrees
Winter Low: the January low is 41
Rain: averages 19 inches of rain a year
Snow: averages 0 inches of snow a year
BESTPLACES COMFORT INDEX
The annual BestPlaces Comfort Index for Foster City is 8.7 (10=best), which means it is more comfortable than most places in California.
8.7 / 10
August, July and September are the most pleasant months in Foster City, while January and December are the least comfortable months.