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

Prolonged Atmospheric River Will Impact the Northwest Early this Week

A weather system in the Pacific Northwest will produce rain throughout the day, before a potent atmospheric river produces a prolonged round of heavy rainfall, widespread urban and river flooding, and high elevation snow to the region Monday through Wednesday. Showers and thunderstorms may produce isolated damaging winds, a brief tornado, and locally heavy rainfall across parts of Florida today. Read More >

Current conditions at

San Francisco, San Francisco International Airport (KSFO)

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

Clear

50°F

10°C

Humidity 87%
Wind Speed N 5 MPH
Barometer 30.28 in (1025.4 mb)
Dewpoint 46°F (8°C)
Visibility 9.00 mi
Wind Chill48°F (9°C)
Last update 07 Dec 06:35 PM PST
Extended Forecast for

San Mateo CA

  • Tonight

    Tonight: Patchy fog after 9pm. Otherwise, mostly clear, with a low around 45. Northwest wind around 5 mph becoming calm in the evening.

    Low: 45 °F

    Patchy Fog

  • Monday

    Monday: Areas of fog before 9am. Otherwise, sunny, with a high near 58. North wind 3 to 6 mph.

    High: 58 °F

    Areas Fog
    then Sunny

  • Monday Night

    Monday Night: Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 46. North northwest wind 3 to 5 mph.

    Low: 46 °F

    Patchy Fog

  • Tuesday

    Tuesday: Areas of fog before 10am. Otherwise, mostly sunny, with a high near 63. Calm wind becoming north northwest around 6 mph in the morning.

    High: 63 °F

    Areas Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 3am. Otherwise, mostly clear, with a low around 46. North northeast wind 3 to 5 mph.

    Low: 46 °F

    Mostly Clear
    then Patchy
    Fog

  • Wednesday

    Wednesday: Areas of fog before 9am. Otherwise, sunny, with a high near 67.

    High: 67 °F

    Areas Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog after 5am. Otherwise, mostly clear, with a low around 48.

    Low: 48 °F

    Mostly Clear
    then Patchy
    Fog

  • Thursday

    Thursday: Areas of fog before 9am. Otherwise, sunny, with a high near 68.

    High: 68 °F

    Areas Fog
    then Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 9pm. Otherwise, mostly clear, with a low around 45. Northwest wind around 5 mph becoming calm in the evening.
Monday
Areas of fog before 9am. Otherwise, sunny, with a high near 58. North wind 3 to 6 mph.
Monday Night
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 46. North northwest wind 3 to 5 mph.
Tuesday
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 63. Calm wind becoming north northwest around 6 mph in the morning.
Tuesday Night
Patchy fog after 3am. Otherwise, mostly clear, with a low around 46. North northeast wind 3 to 5 mph.
Wednesday
Areas of fog before 9am. Otherwise, sunny, with a high near 67.
Wednesday Night
Patchy fog after 5am. Otherwise, mostly clear, with a low around 48.
Thursday
Areas of fog before 9am. Otherwise, sunny, with a high near 68.
Thursday Night
Mostly clear, with a low around 47.
Friday
Patchy fog before 8am. Otherwise, sunny, with a high near 67.
Friday Night
Patchy fog. Otherwise, mostly clear, with a low around 46.
Saturday
Patchy fog. Otherwise, sunny, with a high near 66.
Saturday Night
Patchy fog. Otherwise, partly cloudy, with a low around 47.
Sunday
Patchy fog. Otherwise, mostly sunny, with a high near 64.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Mateo CA
 37.54°N 122.32°W (Elev. 194 ft)
Last Update:
6:20 pm PST Dec 7, 2025
Forecast Valid:
6pm PST Dec 7, 2025-6pm PST Dec 14, 2025
 
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Additional Resources

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