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

Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across much of northeast Texas into the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Saturday could bring areas of flooding across parts of the central Plains into the upper Midwest/Great Lakes, and Four Corners states. Read More >

Current conditions at

San Francisco, San Francisco International Airport (KSFO)

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

Overcast

68°F

20°C

Humidity 60%
Wind Speed WSW 10 MPH
Barometer 30.13 in (1020.32 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 17 Sep 12:35 PM PDT
Extended Forecast for

San Mateo CA

  • This Afternoon

    This Afternoon: Partly sunny, then gradually becoming sunny, with a high near 74. West southwest wind 5 to 8 mph.

    High: 74 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 58. West wind around 6 mph becoming calm in the evening.

    Low: 58 °F

    Increasing
    Clouds

  • Friday

    Friday: Mostly cloudy through mid morning, then gradual clearing, with a high near 77. Light west wind increasing to 6 to 11 mph in the afternoon.

    High: 77 °F

    Becoming
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 58. West southwest wind 5 to 10 mph.

    Low: 58 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 80. Calm wind becoming west 5 to 8 mph in the afternoon.

    High: 80 °F

    Mostly Sunny

  • Saturday Night

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

    Low: 58 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 74.

    High: 74 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 58.

    Low: 58 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Partly sunny, then gradually becoming sunny, with a high near 74. West southwest wind 5 to 8 mph.
Tonight
Increasing clouds, with a low around 58. West wind around 6 mph becoming calm in the evening.
Friday
Mostly cloudy through mid morning, then gradual clearing, with a high near 77. Light west wind increasing to 6 to 11 mph in the afternoon.
Friday Night
Mostly clear, with a low around 58. West southwest wind 5 to 10 mph.
Saturday
Mostly sunny, with a high near 80. Calm wind becoming west 5 to 8 mph in the afternoon.
Saturday Night
Partly cloudy, with a low around 58.
Sunday
Partly sunny, with a high near 74.
Sunday Night
Mostly cloudy, with a low around 58.
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 83.
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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:
12:41 pm PDT Sep 17, 2026
Forecast Valid:
12pm PDT Sep 17, 2026-6pm PDT Sep 23, 2026
 
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Additional Resources

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Chance of Precipitation