Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds from the Upper Midwest into the Northeast

A prolonged atmospheric river will continue to impact the Pacific Northwest into the Northern Rockies with heavy rainfall, areas of urban and river flooding, landslides, heavy mountain snow, and gusty winds into Thursday. A strong clipper system will bring the threat of heavy snow and high winds across the Upper Midwest/Great Lakes as well as portions of the interior Northeast and Appalachians. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

Lat: 38.2075°NLon: 122.27944°WElev: 33.0ft.

Partly Cloudy

45°F

7°C

Humidity 93%
Wind Speed E 12 MPH
Barometer 30.21 in (1023.03 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 09 Dec 05:00 PM PST
Extended Forecast for

Sonoma CA

  • Tonight

    Tonight: Patchy dense fog after 7pm.  Otherwise, partly cloudy, with a low around 40. Calm wind.

    Low: 40 °F

    Patchy Dense
    Fog

  • Wednesday

    Wednesday: Areas of dense fog before noon.  Otherwise, mostly sunny, with a high near 62. Calm wind.

    High: 62 °F

    Areas Dense
    Fog then
    Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog after 9pm.  Otherwise, mostly clear, with a low around 42. Calm wind.

    Low: 42 °F

    Patchy Fog

  • Thursday

    Thursday: Areas of fog before 11am.  Otherwise, mostly sunny, with a high near 65. Light east wind.

    High: 65 °F

    Areas Fog
    then Sunny

  • Thursday Night

    Thursday Night: Patchy fog before 1am, then patchy fog after 5am.  Otherwise, mostly clear, with a low around 41. Calm wind.

    Low: 41 °F

    Mostly Clear
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 10am.  Otherwise, mostly sunny, with a high near 62.

    High: 62 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Patchy fog before 4am, then patchy fog after 5am.  Otherwise, mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear
    then Patchy
    Fog

  • Saturday

    Saturday: Patchy fog before 9am.  Otherwise, mostly sunny, with a high near 61.

    High: 61 °F

    Patchy Fog
    then Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 9pm.  Otherwise, partly cloudy, with a low around 41.

    Low: 41 °F

    Patchy Fog

Detailed Forecast

Tonight
Patchy dense fog after 7pm. Otherwise, partly cloudy, with a low around 40. Calm wind.
Wednesday
Areas of dense fog before noon. Otherwise, mostly sunny, with a high near 62. Calm wind.
Wednesday Night
Patchy fog after 9pm. Otherwise, mostly clear, with a low around 42. Calm wind.
Thursday
Areas of fog before 11am. Otherwise, mostly sunny, with a high near 65. Light east wind.
Thursday Night
Patchy fog before 1am, then patchy fog after 5am. Otherwise, mostly clear, with a low around 41. Calm wind.
Friday
Patchy fog before 10am. Otherwise, mostly sunny, with a high near 62.
Friday Night
Patchy fog before 4am, then patchy fog after 5am. Otherwise, mostly clear, with a low around 40.
Saturday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 61.
Saturday Night
Patchy fog after 9pm. Otherwise, partly cloudy, with a low around 41.
Sunday
Areas of fog before 11am. Otherwise, partly sunny, with a high near 60.
Sunday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 43.
Monday
A slight chance of rain. Areas of fog. Otherwise, mostly cloudy, with a high near 60.
Monday Night
A chance of rain. Patchy fog. Otherwise, mostly cloudy, with a low around 47.
Tuesday
A chance of rain. Areas of fog. Otherwise, partly sunny, with a high near 63.
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ABOUT THIS FORECAST

 
Point Forecast:
Sonoma CA
 38.29°N 122.46°W (Elev. 72 ft)
12:26 pm PST Dec 9, 2025
5pm PST Dec 9, 2025-6pm PST Dec 16, 2025
 
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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