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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

San Francisco, San Francisco International Airport (KSFO)

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

Mostly Cloudy

59°F

15°C

Humidity 89%
Wind Speed NW 9 MPH
Barometer 29.95 in (1014.22 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 28 Aug 07:03 AM PDT
Extended Forecast for

San Mateo CASimilar City Names

  • Today

    Today: A 20 percent chance of showers. Cloudy through mid morning, then gradual clearing, with a high near 74. West wind 5 to 10 mph.

    High: 74 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Partly cloudy, with a low around 56. West southwest wind 5 to 10 mph.

    Low: 56 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 72. West wind 6 to 14 mph, with gusts as high as 24 mph.

    High: 72 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 56. West wind 11 to 15 mph, with gusts as high as 26 mph.

    Low: 56 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 72. West southwest wind 7 to 9 mph, with gusts as high as 21 mph.

    High: 72 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 70.

    High: 70 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 72.

    High: 72 °F

    Partly Sunny

Detailed Forecast

Today
A 20 percent chance of showers. Cloudy through mid morning, then gradual clearing, with a high near 74. West wind 5 to 10 mph.
Tonight
Partly cloudy, with a low around 56. West southwest wind 5 to 10 mph.
Saturday
Mostly sunny, with a high near 72. West wind 6 to 14 mph, with gusts as high as 24 mph.
Saturday Night
Mostly clear, with a low around 56. West wind 11 to 15 mph, with gusts as high as 26 mph.
Sunday
Mostly sunny, with a high near 72. West southwest wind 7 to 9 mph, with gusts as high as 21 mph.
Sunday Night
Mostly clear, with a low around 55.
Monday
Mostly sunny, with a high near 70.
Monday Night
Partly cloudy, with a low around 56.
Tuesday
Partly sunny, with a high near 72.
Tuesday Night
Mostly clear, with a low around 56.
Wednesday
Mostly sunny, with a high near 73.
Wednesday Night
Mostly clear, with a low around 56.
Thursday
Mostly sunny, with a high near 76.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Mateo CASimilar City Names
 37.56°N 122.33°W (Elev. 108 ft)
Last Update:
6:57 am PDT Aug 28, 2026
Forecast Valid:
7am PDT Aug 28, 2026-6pm PDT Sep 3, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation