Prolonged Atmospheric River in the Northwest; Snow in the North-Central US

A prolonged atmospheric river will bring heavy rainfall which may lead to widespread urban and river flooding, heavy mountain snow, along with gusty winds to the Pacific Northwest into the northern Rockies through much of the week. A clipper will bring a period of snow across the upper Midwest and the Great Lakes into Tuesday, before a stronger system bring more wintry impacts. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Overcast

45°F

7°C

Humidity 93%
Wind Speed E 6 MPH
Barometer 30.32 in (1026.75 mb)
Dewpoint 43°F (6°C)
Visibility 7.00 mi
Wind Chill42°F (6°C)
Last update 08 Dec 11:35 PM PST
Extended Forecast for

3 Miles NNW Vallejo CA

  • Tonight

    Tonight: Areas of fog after midnight.  Otherwise, mostly cloudy, with a low around 40. East northeast wind around 5 mph becoming calm  after midnight.

    Low: 40 °F

    Areas Fog

  • Tuesday

    Tuesday: Patchy fog before 9am.  Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 55. Light east wind.

    High: 55 °F

    Patchy Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy dense fog.  Otherwise, mostly clear, with a low around 42. Calm wind.

    Low: 42 °F

    Patchy Dense
    Fog

  • Wednesday

    Wednesday: Patchy dense fog before 9am.  Otherwise, mostly sunny, with a high near 57. East wind 3 to 5 mph.

    High: 57 °F

    Patchy Dense
    Fog then
    Sunny

  • Wednesday Night

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

    Low: 42 °F

    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 7am.  Otherwise, mostly sunny, with a high near 61.

    High: 61 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 11pm.  Otherwise, mostly clear, with a low around 42.

    Low: 42 °F

    Patchy Fog

  • Friday

    Friday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Patchy fog before 11pm, then patchy fog after 3am.  Otherwise, partly cloudy, with a low around 42.

    Low: 42 °F

    Patchy Fog

Detailed Forecast

Tonight
Areas of fog after midnight. Otherwise, mostly cloudy, with a low around 40. East northeast wind around 5 mph becoming calm after midnight.
Tuesday
Patchy fog before 9am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 55. Light east wind.
Tuesday Night
Patchy dense fog. Otherwise, mostly clear, with a low around 42. Calm wind.
Wednesday
Patchy dense fog before 9am. Otherwise, mostly sunny, with a high near 57. East wind 3 to 5 mph.
Wednesday Night
Patchy fog. Otherwise, mostly clear, with a low around 42. Calm wind.
Thursday
Patchy fog before 7am. Otherwise, mostly sunny, with a high near 61.
Thursday Night
Patchy fog after 11pm. Otherwise, mostly clear, with a low around 42.
Friday
Mostly sunny, with a high near 59.
Friday Night
Patchy fog before 11pm, then patchy fog after 3am. Otherwise, partly cloudy, with a low around 42.
Saturday
Patchy fog before 7am. Otherwise, mostly sunny, with a high near 58.
Saturday Night
Patchy fog. Otherwise, partly cloudy, with a low around 43.
Sunday
Areas of fog. Otherwise, partly sunny, with a high near 57.
Sunday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 45.
Monday
A slight chance of rain. Areas of fog. Otherwise, partly sunny, with a high near 57.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Vallejo CA
 38.18°N 122.26°W (Elev. 56 ft)
11:52 pm PST Dec 8, 2025
11pm PST Dec 8, 2025-6pm PST Dec 15, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database