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

Hot Temperatures in the Northwest U.S.; Excessive Rainfall Potential in the Southwest U.S.

Hot to extremely hot daytime temperatures remain in place across coastal southern California and the interior Northwest, with the Northwest carrying the potential for record-breaking high temperatures. A combination of monsoonal moisture and tropical moisture ahead of tropical cyclone Lorena will bring a marginal to slight risk of excessive rainfall across the southwest U.S. this week. Read More >

Current conditions at

San Francisco, San Francisco International Airport (KSFO)

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

Partly Cloudy

66°F

19°C

Humidity 72%
Wind Speed SW 18 MPH
Barometer 29.96 in (1014.56 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 02 Sep 07:10 PM PDT
Extended Forecast for

San Mateo CA

  • Tonight

    Tonight: Increasing clouds, with a low around 59. West southwest wind 5 to 9 mph.

    Low: 59 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, then gradually becoming sunny, with a high near 77. Light and variable wind becoming west 5 to 10 mph in the morning.

    High: 77 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 59. West wind 5 to 8 mph becoming calm in the evening.

    Low: 59 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly sunny, with a high near 75. Light west wind increasing to 5 to 10 mph in the afternoon.

    High: 75 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 60. West wind 6 to 11 mph, with gusts as high as 18 mph.

    Low: 60 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 73.

    High: 73 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 59. West southwest wind 5 to 9 mph.
Wednesday
Partly sunny, then gradually becoming sunny, with a high near 77. Light and variable wind becoming west 5 to 10 mph in the morning.
Wednesday Night
Increasing clouds, with a low around 59. West wind 5 to 8 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 75. Light west wind increasing to 5 to 10 mph in the afternoon.
Thursday Night
Mostly cloudy, with a low around 60. West wind 6 to 11 mph, with gusts as high as 18 mph.
Friday
Partly sunny, with a high near 73.
Friday Night
Partly cloudy, with a low around 59.
Saturday
Mostly sunny, with a high near 74.
Saturday Night
Mostly clear, with a low around 60.
Sunday
Mostly sunny, with a high near 75.
Sunday Night
Partly cloudy, with a low around 60.
Monday
Mostly sunny, with a high near 74.
Monday Night
Partly cloudy, with a low around 60.
Tuesday
Mostly sunny, with a high near 74.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Mateo CA
 37.58°N 122.33°W (Elev. 33 ft)
Last Update:
1:26 pm PDT Sep 2, 2025
Forecast Valid:
7pm PDT Sep 2, 2025-6pm PDT Sep 9, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation