National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Lake Effect Snow Downwind of Lakes Erie and Ontario; Fire Weather Concerns in the Southern Plains and Southeast

A multi-day heavy lake effect snow event is expected downwind of Lakes Erie and Ontario through New Year's Day. There is increasing confidence in snow squalls causing bursts of snow & gusty winds on New Year's Eve. Elevated fire weather conditions will continue today over parts of the Southern Plains and across much of the Southeast U.S. Read More >

Hazardous Weather Conditions

Current conditions at

Napa, Napa County Airport (KAPC)

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

Mist

36°F

2°C

Humidity 93%
Wind Speed NNE 5 MPH
Barometer 30.22 in (1023.37 mb)
Dewpoint 34°F (1°C)
Visibility 2.50 mi
Wind Chill32°F (0°C)
Last update 30 Dec 07:20 AM PST
Extended Forecast for

4 Miles N Sonoma CA

Cold Weather Advisory until December 30, 09:00am
Click here for hazard details and duration
...
  •  
    Cold Weather Advisory until December 30, 09:00am

    NOW until 9:00am Tue

    Cold Weather Advisory

  • Today

    High: 52 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, with a steady temperature around 50. North northeast wind around 9 mph.

    Low: 50 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of rain after 10am. Cloudy, with a temperature falling to around 48 by 3pm. East northeast wind 7 to 9 mph. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 52 °F⇓

    Chance Rain

  • Wednesday Night

    Wednesday Night: Rain. Low around 47. East wind around 9 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 47 °F

    Rain

  • New Year's Day

    New Year's Day: Rain. Patchy fog before 1pm, then patchy fog after 4pm. High near 56. East wind 6 to 8 mph becoming south in the afternoon. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 56 °F

    Rain and
    Patchy Fog

  • Thursday Night

    Thursday Night: Rain before 4am, then showers likely and possibly a thunderstorm after 4am. Patchy fog before 7pm. Low around 52. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 52 °F

    Showers and
    Patchy Fog

  • Friday

    Friday: Showers likely and possibly a thunderstorm, then rain after 10am. High near 55. Chance of precipitation is 80%.

    High: 55 °F

    Showers

  • Friday Night

    Friday Night: Rain. Cloudy, with a low around 47.

    Low: 47 °F

    Rain

Detailed Forecast

Today
Increasing clouds, with a high near 52. Northeast wind 6 to 11 mph.
Tonight
Mostly cloudy, with a steady temperature around 50. North northeast wind around 9 mph.
Wednesday
A 50 percent chance of rain after 10am. Cloudy, with a temperature falling to around 48 by 3pm. East northeast wind 7 to 9 mph. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Rain. Low around 47. East wind around 9 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
New Year's Day
Rain. Patchy fog before 1pm, then patchy fog after 4pm. High near 56. East wind 6 to 8 mph becoming south in the afternoon. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Rain before 4am, then showers likely and possibly a thunderstorm after 4am. Patchy fog before 7pm. Low around 52. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
Showers likely and possibly a thunderstorm, then rain after 10am. High near 55. Chance of precipitation is 80%.
Friday Night
Rain. Cloudy, with a low around 47.
Saturday
Rain likely. Patchy fog between 1pm and 3pm. Otherwise, mostly cloudy, with a high near 50.
Saturday Night
Rain likely. Mostly cloudy, with a low around 45.
Sunday
A chance of rain. Mostly cloudy, with a high near 49.
Sunday Night
Rain likely. Mostly cloudy, with a low around 45.
Monday
Rain likely. Mostly cloudy, with a high near 50.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles N Sonoma CA
 38.36°N 122.45°W (Elev. 1818 ft)
Last Update:
12:27 am PST Dec 30, 2025
Forecast Valid:
7am PST Dec 30, 2025-6pm PST Jan 5, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation