National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

San Francisco, San Francisco International Airport (KSFO)

Lat: 37.61961°NLon: 122.36558°WElev: 10.0ft.

Overcast

61°F

16°C

Humidity 82%
Wind Speed W 9 MPH
Barometer 30.06 in (1017.95 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 18 Sep 11:00 PM PDT
Extended Forecast for

San Mateo CA

  • Tonight

    Tonight: Partly cloudy, with a low around 58. West southwest wind 3 to 8 mph.

    Low: 58 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, then gradually becoming sunny, with a high near 79. Light and variable wind becoming west 5 to 10 mph in the afternoon.

    High: 79 °F

    Becoming
    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 58. West southwest wind 6 to 10 mph.

    Low: 58 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 73. West wind 5 to 8 mph.

    High: 73 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 58. West wind 6 to 9 mph.

    Low: 58 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 58. West southwest wind 3 to 8 mph.
Saturday
Partly sunny, then gradually becoming sunny, with a high near 79. Light and variable wind becoming west 5 to 10 mph in the afternoon.
Saturday Night
Mostly cloudy, with a low around 58. West southwest wind 6 to 10 mph.
Sunday
Mostly cloudy, with a high near 73. West wind 5 to 8 mph.
Sunday Night
Mostly cloudy, with a low around 58. West wind 6 to 9 mph.
Monday
Mostly sunny, with a high near 75.
Monday Night
Partly cloudy, with a low around 58.
Tuesday
Mostly sunny, with a high near 79.
Tuesday Night
Mostly clear, with a low around 58.
Wednesday
Sunny, with a high near 87.
Wednesday Night
Mostly clear, with a low around 60.
Thursday
Sunny, with a high near 88.
Thursday Night
Mostly clear, with a low around 61.
Friday
Mostly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Mateo CA
 37.56°N 122.33°W (Elev. 108 ft)
Last Update:
1:26 pm PDT Sep 18, 2026
Forecast Valid:
11pm PDT Sep 18, 2026-6pm PDT Sep 25, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

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Chance of Precipitation