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San Mateo (CA) Weather and Climate: A Comprehensive Guide

Temperatures see a moderate degree of fluctuation, transitioning from warm conditions to mild. The city tends toward drier weather patterns. Now, let’s break down all the climate details for a clearer picture.

Average maximum day and minimum night temperature

In San Mateo, seasonal changes bring about a moderate variation in temperatures. Average daytime temperatures reach a comfortable 24°C in September. In January, the coolest month of the year, temperatures drop to a moderate 15°C.

At night, you can expect cooler temperatures, with averages dropping to around 6°C during this month. Check out our detailed temperature page for more information.

Temperature ranges by month

Precipitation and rainy days

San Mateo typically sees modest rainfall throughout the year, with an average annual precipitation of 415 mm. San Mateo can be quite wet during December, receiving approximately 99 mm of precipitation over 13 rainy days.

In contrast July, experiences much drier conditions, with 0 mm of rainfall, spread across 0 rainy days. For more details, please visit our San Mateo Precipitation page.

The mean monthly precipitation over the year, including rain, hail and snow

Sunshine over the year

San Mateo can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 10.8 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 5.3 hours of sunlight per day. Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Data from: San Francisco, the United States of America (10 KM, 6 Miles).

Daily hours of sunshine

Data from: San Francisco, the United States of America (10 KM, 6 Miles).

Average water temperature

The mean water temperature over the year ranges from 12°C in January to 14°C in June.

Water temperature over the year

Data from: San Francisco, the United States of America (10 KM, 6 Miles).

Forecast for San Mateo (CA)

Wed   Dec 25
13°C | 7°C
NW 3 m/s
broken clouds and no rain

broken clouds and no rain

Thu   Dec 26
15°C | 11°C
S 5 m/s
1.7 mm
broken clouds and slight rain

broken clouds and slight rain

Fri   Dec 27
17°C | 12°C
W 5 m/s
16 mm
broken clouds and rain

broken clouds and rain

The best time of year to visit San Mateo in the United States of America

During the months of May, June, July, August, September and October you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:
  • Does San Mateo have a dry season?
    Yes, the months of May, June, July, August and September are very dry.
  • Which is the warmest month in San Mateo?
    September has an average maximum temperature of 24°C and is the warmest month of the year.
  • Which is the coldest month in San Mateo?
    The coldest month is December with an average maximum temperature of 15°C.
  • Which is the wettest month in San Mateo?
    December tops the wettest month list with 99 mm of rainfall.
  • Which is the driest month in San Mateo?
    July is the driest month with 0 mm of precipitation.
  • Which is the sunniest month in San Mateo?
    May is the sunniest month with an average of 324 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.