Extreme Heat Across the Southern U.S.; Flash Flooding Threats in the Mid-Atlantic, Northeast, and Four Corners Region

Dangerous and extreme heat will remain across portions of the southern U.S. this week. Heavy rainfall may bring significant flash flooding across portions of the Mid-Atlantic and Northeast through the night, and additional flash flooding concerns across New England on Wednesday. Monsoonal thunderstorms will bring a flash flood risk to the Four Corners region, especially in burn scar areas Read More >

Current conditions at

San Francisco, San Francisco International Airport (KSFO)

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

Mostly Cloudy

61°F

16°C

Humidity 83%
Wind Speed W 14 MPH
Barometer 29.91 in (1012.87 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 28 Jul 10:56 PM PDT
Extended Forecast for

San Mateo CA

  • Tonight

    Tonight: Mostly clear, with a low around 57. West southwest wind 6 to 9 mph, with gusts as high as 18 mph.

    Low: 57 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 76. West wind 6 to 14 mph, with gusts as high as 22 mph.

    High: 76 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 56. West southwest wind 6 to 11 mph, with gusts as high as 21 mph.

    Low: 56 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Partly sunny, then gradually becoming sunny, with a high near 77. West wind 6 to 11 mph, with gusts as high as 18 mph.

    High: 77 °F

    Becoming
    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 56. West southwest wind 5 to 13 mph, with gusts as high as 21 mph.

    Low: 56 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Friday Night

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

    Low: 58 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 58.

    Low: 58 °F

    Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 57. West southwest wind 6 to 9 mph, with gusts as high as 18 mph.
Wednesday
Sunny, with a high near 76. West wind 6 to 14 mph, with gusts as high as 22 mph.
Wednesday Night
Increasing clouds, with a low around 56. West southwest wind 6 to 11 mph, with gusts as high as 21 mph.
Thursday
Partly sunny, then gradually becoming sunny, with a high near 77. West wind 6 to 11 mph, with gusts as high as 18 mph.
Thursday Night
Clear, with a low around 56. West southwest wind 5 to 13 mph, with gusts as high as 21 mph.
Friday
Sunny, with a high near 80.
Friday Night
Mostly clear, with a low around 58.
Saturday
Sunny, with a high near 81.
Saturday Night
Clear, with a low around 58.
Sunday
Sunny, with a high near 80.
Sunday Night
Clear, with a low around 58.
Monday
Sunny, with a high near 80.
Monday Night
Mostly clear, with a low around 58.
Tuesday
Sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
San Mateo CA
 37.56°N 122.33°W (Elev. 108 ft)
1:26 pm PDT Jul 28, 2026
11pm PDT Jul 28, 2026-6pm PDT Aug 4, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database