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

43°F

6°C

Humidity 100%
Wind Speed ENE 3 MPH
Barometer 30.31 in (1026.41 mb)
Dewpoint 43°F (6°C)
Visibility 8.00 mi
Last update 09 Dec 12:20 AM PST
Extended Forecast for

2 Miles NNW Vallejo CA

  • Overnight

    Overnight: Areas of fog.  Otherwise, mostly cloudy, with a low around 41. Calm wind.

    Low: 41 °F

    Areas Fog

  • Tuesday

    Tuesday: Patchy fog before 9am.  Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 56. Light east northeast wind.

    High: 56 °F

    Patchy Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy dense fog after 9pm.  Otherwise, partly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Patchy Dense
    Fog

  • Wednesday

    Wednesday: Patchy dense fog before 7am.  Otherwise, mostly sunny, with a high near 58. East wind 3 to 5 mph.

    High: 58 °F

    Patchy Dense
    Fog then
    Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog after 10pm.  Otherwise, mostly clear, with a low around 43. Calm wind.

    Low: 43 °F

    Patchy Fog

  • Thursday

    Thursday: Mostly sunny, with a high near 61.

    High: 61 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 2am.  Otherwise, mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear
    then Patchy
    Fog

  • Friday

    Friday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Patchy fog after midnight.  Otherwise, partly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Clear
    then Patchy
    Fog

Detailed Forecast

Overnight
Areas of fog. Otherwise, mostly cloudy, with a low around 41. Calm wind.
Tuesday
Patchy fog before 9am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 56. Light east northeast wind.
Tuesday Night
Patchy dense fog after 9pm. Otherwise, partly cloudy, with a low around 42. Calm wind.
Wednesday
Patchy dense fog before 7am. Otherwise, mostly sunny, with a high near 58. East wind 3 to 5 mph.
Wednesday Night
Patchy fog after 10pm. Otherwise, mostly clear, with a low around 43. Calm wind.
Thursday
Mostly sunny, with a high near 61.
Thursday Night
Patchy fog after 2am. Otherwise, mostly clear, with a low around 42.
Friday
Mostly sunny, with a high near 59.
Friday Night
Patchy fog after midnight. Otherwise, partly cloudy, with a low around 42.
Saturday
Mostly sunny, with a high near 58.
Saturday Night
Patchy fog. Otherwise, partly cloudy, with a low around 43.
Sunday
Patchy fog. Otherwise, partly sunny, with a high near 58.
Sunday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 46.
Monday
A slight chance of rain. Areas of fog. Otherwise, partly sunny, with a high near 58.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Vallejo CA
 38.16°N 122.25°W (Elev. 26 ft)
12:26 am PST Dec 9, 2025
12am PST Dec 9, 2025-6pm PST Dec 15, 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