South San Francisco, CA has a warm-summer Mediterranean climate, with temperatures ranging from the mid 40s during the winter months to the mid 70s in summer. The region sees minimal rainfall throughout the year, with an average of only 16 inches annually. Summers are mostly dry and mild, while winters are cool and wet. The city experiences significant fog throughout the year due to its proximity to the Pacific Ocean. During spring and fall, South San Francisco also experiences frequent windy days which can bring coastal breezes up into the region.
South San Francisco, California gets 22 inches of rain, on average, per year. The US average is 38 inches of rain per year.
South San Francisco averages 0 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 259 sunny days per year in South San Francisco. The US average is 205 sunny days.
South San Francisco gets some kind of precipitation, on average, 68 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 67 degrees
Winter Low: the January low is 45
Rain: averages 22 inches of rain a year
Snow: averages 0 inches of snow a year