The climate in 94403 San Mateo, CA is generally mild and comfortable. Summers are warm with temperatures typically ranging between the mid-60s at night to the mid-70s during the day. Winters are fairly mild with temperatures usually remaining in the 50's during the day and dropping to the low 40s at night. The average annual rainfall for this area is approximately 20 inches and snowfall is rare. There are occasional hot spells throughout summer months, but overall temperatures remain mild most of the year.
San Mateo (zip 94403), California gets 23 inches of rain, on average, per year. The US average is 38 inches of rain per year.
San Mateo (zip 94403) averages 0 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 260 sunny days per year in San Mateo (zip 94403). The US average is 205 sunny days.
San Mateo (zip 94403) gets some kind of precipitation, on average, 81 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 73 degrees
Winter Low: the January low is 42
Rain: averages 23 inches of rain a year
Snow: averages 0 inches of snow a year