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

Late January Extreme Cold; Watching for Another East Coast Storm Threat This Weekend

Well below normal temperatures will continue for the eastern half of the Lower 48 this week. Another blast of arctic air will spread from the Plains through the East/Southeast Friday into Saturday with more record lows expected even into Florida. Forecasts are being monitored for increasing potential of another significant winter storm to impact the eastern United States this coming weekend. Read More >

Current conditions at

San Francisco, San Francisco International Airport (KSFO)

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

Mostly Cloudy

55°F

13°C

Humidity 76%
Wind Speed E 3 MPH
Barometer 30.24 in (1024.04 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 27 Jan 03:00 PM PST
Extended Forecast for

San Mateo CA

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 63. South southwest wind around 10 mph.

    High: 63 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 50 percent chance of rain. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 51. South wind 5 to 7 mph becoming calm after midnight. New precipitation amounts of less than a tenth of an inch possible.

    Low: 51 °F

    Chance Rain
    and Patchy
    Fog

  • Wednesday

    Wednesday: Patchy fog between 7am and 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 61. North northwest wind 3 to 7 mph.

    High: 61 °F

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 45. Light and variable wind.

    Low: 45 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 62. Calm wind becoming north around 6 mph in the afternoon.

    High: 62 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 65.

    High: 65 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 48.

    Low: 48 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 66.

    High: 66 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 63. South southwest wind around 10 mph.
Tonight
A 50 percent chance of rain. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 51. South wind 5 to 7 mph becoming calm after midnight. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
Patchy fog between 7am and 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 61. North northwest wind 3 to 7 mph.
Wednesday Night
Mostly clear, with a low around 45. Light and variable wind.
Thursday
Mostly sunny, with a high near 62. Calm wind becoming north around 6 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Partly sunny, with a high near 65.
Friday Night
Mostly cloudy, with a low around 48.
Saturday
Partly sunny, with a high near 66.
Saturday Night
A slight chance of rain after 4am. Mostly cloudy, with a low around 50.
Sunday
A chance of rain. Mostly cloudy, with a high near 62.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 50.
Monday
Mostly sunny, with a high near 61.
Monday Night
Patchy fog. Otherwise, partly cloudy, with a low around 48.
Tuesday
Patchy fog. Otherwise, sunny, with a high near 62.
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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:
12:26 pm PST Jan 27, 2026
Forecast Valid:
3pm PST Jan 27, 2026-6pm PST Feb 3, 2026
 
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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