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.

Mostly Cloudy

52°F

11°C

Humidity 81%
Wind Speed N 5 MPH
Barometer 30.26 in (1024.72 mb)
Dewpoint 46°F (8°C)
Visibility 9.00 mi
Last update 07 Dec 05:00 PM PST
Extended Forecast for

2 Miles NW San Mateo CA

  • Tonight

    Tonight: Patchy fog before 11pm, then patchy fog after 2am. Otherwise, mostly clear, with a low around 46. Light northwest wind.

    Low: 46 °F

    Patchy Fog

  • Monday

    Monday: Areas of fog before 9am. Otherwise, sunny, with a high near 62. North wind 3 to 6 mph.

    High: 62 °F

    Areas Fog
    then Sunny

  • Monday Night

    Monday Night: Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 48. Northwest wind around 5 mph becoming calm in the evening.

    Low: 48 °F

    Patchy Fog

  • Tuesday

    Tuesday: Areas of fog before 11am. Otherwise, mostly sunny, with a high near 62. Calm wind becoming north northwest around 6 mph in the morning.

    High: 62 °F

    Areas Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 3am. Otherwise, mostly clear, with a low around 48. Light north wind.

    Low: 48 °F

    Mostly Clear
    then Patchy
    Fog

  • Wednesday

    Wednesday: Patchy fog before 9am. Otherwise, sunny, with a high near 65.

    High: 65 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog after 3am. Otherwise, mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear
    then Patchy
    Fog

  • Thursday

    Thursday: Patchy fog before 9am. Otherwise, sunny, with a high near 66.

    High: 66 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog before 11pm, then patchy fog after 2am. Otherwise, mostly clear, with a low around 46. Light northwest wind.
Monday
Areas of fog before 9am. Otherwise, sunny, with a high near 62. North wind 3 to 6 mph.
Monday Night
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 48. Northwest wind around 5 mph becoming calm in the evening.
Tuesday
Areas of fog before 11am. Otherwise, mostly sunny, with a high near 62. Calm wind becoming north northwest around 6 mph in the morning.
Tuesday Night
Patchy fog after 3am. Otherwise, mostly clear, with a low around 48. Light north wind.
Wednesday
Patchy fog before 9am. Otherwise, sunny, with a high near 65.
Wednesday Night
Patchy fog after 3am. Otherwise, mostly clear, with a low around 49.
Thursday
Patchy fog before 9am. Otherwise, sunny, with a high near 66.
Thursday Night
Mostly clear, with a low around 49.
Friday
Sunny, with a high near 65.
Friday Night
Patchy fog. Otherwise, mostly clear, with a low around 48.
Saturday
Patchy fog. Otherwise, sunny, with a high near 65.
Saturday Night
Patchy fog. Otherwise, partly cloudy, with a low around 49.
Sunday
Patchy fog. Otherwise, mostly sunny, with a high near 63.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NW San Mateo CA
 37.58°N 122.33°W (Elev. 33 ft)
Last Update:
5:02 pm PST Dec 7, 2025
Forecast Valid:
5pm PST Dec 7, 2025-6pm PST Dec 14, 2025
 
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Additional Resources

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