Tracking Late December Winter Storm Expected to Impact the Northern Plains through the Northeast U.S.

A winter storm system will rapidly intensify over the Midwest on Sunday and track through the Great Lakes on Monday. Periods of heavy snow are anticipated across the Upper Great Lakes late Sunday and continuing into Monday. At least 1/10 inch of ice accumulation is expected from a wintry mix across much of the interior Northeast U.S. starting Sunday afternoon. Read More >

Current conditions at

San Francisco, San Francisco International Airport (KSFO)

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

Partly Cloudy

54°F

12°C

Humidity 71%
Wind Speed N 0 MPH
Barometer 30.17 in (1021.67 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 27 Dec 02:20 PM PST
Extended Forecast for

San Mateo CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 55. North wind around 8 mph.

    High: 55 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 42. Light and variable wind.

    Low: 42 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 55. Light and variable wind becoming north northeast 5 to 7 mph in the morning.

    High: 55 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 42. East northeast wind around 7 mph.

    Low: 42 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 57. East northeast wind 7 to 9 mph.

    High: 57 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 58.

    High: 58 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of rain after 10am.  Partly sunny, with a high near 58.

    High: 58 °F

    Slight Chance
    Rain

Detailed Forecast

This Afternoon
Sunny, with a high near 55. North wind around 8 mph.
Tonight
Partly cloudy, with a low around 42. Light and variable wind.
Sunday
Sunny, with a high near 55. Light and variable wind becoming north northeast 5 to 7 mph in the morning.
Sunday Night
Mostly clear, with a low around 42. East northeast wind around 7 mph.
Monday
Sunny, with a high near 57. East northeast wind 7 to 9 mph.
Monday Night
Mostly clear, with a low around 41.
Tuesday
Sunny, with a high near 58.
Tuesday Night
Partly cloudy, with a low around 43.
Wednesday
A slight chance of rain after 10am. Partly sunny, with a high near 58.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 47.
New Year's Day
Rain likely. Mostly cloudy, with a high near 58.
Thursday Night
Rain likely. Mostly cloudy, with a low around 50.
Friday
A chance of rain. Mostly cloudy, with a high near 57.
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ABOUT THIS FORECAST

 
Point Forecast:
San Mateo CA
 37.58°N 122.33°W (Elev. 33 ft)
12:27 pm PST Dec 27, 2025
2pm PST Dec 27, 2025-6pm PST Jan 2, 2026
 
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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