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

Napa, Napa County Airport (KAPC)

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

Overcast

45°F

7°C

Humidity 93%
Wind Speed E 9 MPH
Barometer 30.32 in (1026.75 mb)
Dewpoint 43°F (6°C)
Visibility 8.00 mi
Wind Chill40°F (4°C)
Last update 07 Dec 07:00 PM PST
Extended Forecast for

Napa CA

  • Tonight

    Tonight: Widespread dense fog, mainly after 9pm. Otherwise, partly cloudy, with a low around 40. Calm wind.

    Low: 40 °F

    Dense Fog

  • Monday

    Monday: Widespread dense fog, mainly before 11am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 49. Calm wind.

    High: 49 °F

    Dense Fog
    then Sunny

  • Monday Night

    Monday Night: Widespread fog, mainly after 10pm. Otherwise, partly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Fog

  • Tuesday

    Tuesday: Widespread fog before noon. Otherwise, mostly sunny, with a high near 60. Calm wind.

    High: 60 °F

    Fog then
    Sunny

  • Tuesday Night

    Tuesday Night: Widespread fog, mainly after 9pm. Otherwise, partly cloudy, with a low around 43. Calm wind.

    Low: 43 °F

    Fog

  • Wednesday

    Wednesday: Widespread fog, mainly before 11am. Otherwise, mostly sunny, with a high near 63.

    High: 63 °F

    Fog then
    Sunny

  • Wednesday Night

    Wednesday Night: Widespread fog, mainly after 9pm. Otherwise, mostly clear, with a low around 44.

    Low: 44 °F

    Fog

  • Thursday

    Thursday: Widespread fog, mainly before 11am. Otherwise, mostly sunny, with a high near 64.

    High: 64 °F

    Fog then
    Sunny

  • Thursday Night

    Thursday Night: Widespread fog, mainly between midnight and 3am. Otherwise, mostly clear, with a low around 43.

    Low: 43 °F

    Fog

Detailed Forecast

Tonight
Widespread dense fog, mainly after 9pm. Otherwise, partly cloudy, with a low around 40. Calm wind.
Monday
Widespread dense fog, mainly before 11am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 49. Calm wind.
Monday Night
Widespread fog, mainly after 10pm. Otherwise, partly cloudy, with a low around 42. Calm wind.
Tuesday
Widespread fog before noon. Otherwise, mostly sunny, with a high near 60. Calm wind.
Tuesday Night
Widespread fog, mainly after 9pm. Otherwise, partly cloudy, with a low around 43. Calm wind.
Wednesday
Widespread fog, mainly before 11am. Otherwise, mostly sunny, with a high near 63.
Wednesday Night
Widespread fog, mainly after 9pm. Otherwise, mostly clear, with a low around 44.
Thursday
Widespread fog, mainly before 11am. Otherwise, mostly sunny, with a high near 64.
Thursday Night
Widespread fog, mainly between midnight and 3am. Otherwise, mostly clear, with a low around 43.
Friday
Widespread fog, mainly before 10am. Otherwise, sunny, with a high near 63.
Friday Night
Patchy fog. Otherwise, mostly clear, with a low around 42.
Saturday
Widespread fog. Otherwise, mostly sunny, with a high near 62.
Saturday Night
Widespread fog. Otherwise, partly cloudy, with a low around 43.
Sunday
Widespread fog. Otherwise, partly sunny, with a high near 60.
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ABOUT THIS FORECAST

 
Point Forecast:
Napa CA
 38.29°N 122.31°W (Elev. 190 ft)
Last Update:
6:20 pm PST Dec 7, 2025
Forecast Valid:
7pm PST Dec 7, 2025-6pm PST Dec 14, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation