San Mateo, California 

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Climate in San Mateo, California

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


The annual BestPlaces Comfort Index for San Mateo is 8.5 (10=best), which means it is more comfortable than most places in California.

9.5 / 7.4

Summer   /   Winter
August, July and September are the most pleasant months in San Mateo, while January and December are the least comfortable months.

Climate Averages
  San Mateo, CaliforniaUnited States
  24.4 in.38.1 in.
  0.0 in.27.8 in.
  76.9 days106.2 days
  265 days205 days
  46 ft.2443 ft.


Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

August is the hottest month for San Mateo with an average high temperature of 74.5°, which ranks it as one of the coolest places in California. In San Mateo, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for San Mateo are August, September and July.

In San Mateo, there are 9.4 days annually when the high temperature is over 90°, which is cooler than most places in California.

January has the coldest nighttime temperatures for San Mateo with an average of 42.2°. This is warmer than most places in California.

In San Mateo, there are 4.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In San Mateo, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

Humidity in San Mateo is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are August, July and September.

January is the wettest month in San Mateo with 4.8 inches of rain, and the driest month is July with 0.1 inches. The wettest season is Spring with 57% of yearly precipitation and 2% occurs in Autumn, which is the driest season. The annual rainfall of 24.4 inches in San Mateo means that it is wetter than most places in California.

January is the rainiest month in San Mateo with 11.6 days of rain, and July is the driest month with only 1.7 rainy days. There are 76.9 rainy days annually in San Mateo, which is rainier than most places in California. The rainiest season is Spring when it rains 44% of the time and the driest is Autumn with only a 7% chance of a rainy day.

There is rarely any recorded snowfall in San Mateo, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in San Mateo.

  • Annual Rainfall (US Avg: 36.5")
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    Reviews for San Mateo    12 Reviews
    Beautiful, family friendly,great sun and food - 12/12/2018
    I have lived in San Mateo since 2013. It has seen tremendous growth, lots of new restaurants which have become progressively more high-end though there is ample... Read More

    Start Your Review of San Mateo

    Los Angeles Suburb by the Bay - 11/11/2018
    I'm a native of California. I have lived in the southern part of the state and the northern part of the state for most of my life. I have spent the last 29 years in... Read More

    A comfortable place - 4/28/2010
    San Mateo has a diverse mix of people, a pleasant climate, a very pleasant downtown park with lots going on, and pretty much whatever you need handy. It's not far to... Read More

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