San Mateo, CA enjoys a mild Mediterranean climate with warm, dry summers and cool, wet winters. The average high temperature in summer is around 73 degrees Fahrenheit, while the average low temperature in winter is about 48 degrees Fahrenheit. San Mateo generally receives between 21 and 23 inches of rainfall each year, with most of it occurring during the cooler months from October to April. Additionally, due to its location on the coast, San Mateo experiences foggy conditions on some days throughout the year.
San Mateo, California gets 24 inches of rain, on average, per year. The US average is 38 inches of rain per year.
San Mateo averages 0 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 265 sunny days per year in San Mateo. The US average is 205 sunny days.
San Mateo gets some kind of precipitation, on average, 77 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 74 degrees
Winter Low: the January low is 42
Rain: averages 24 inches of rain a year
Snow: averages 0 inches of snow a year