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

Lake Effect Snow through Friday; Heavy Rain, Thunderstorms and Mountain Snow in California

Periods of moderate to heavy lake effect snow will continue through Friday downwind of Lake Erie and Ontario. Several additional inches of accumulating snow are expected. A Pacific storm will bring heavy rain and mountain snow across California, the Southwest and Intermountain West today. Isolated severe thunderstorms and scattered flash flooding is possible across parts of southern California. Read More >

Hazardous Weather Conditions

Current conditions at

Napa, Napa County Airport (KAPC)

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

Rain

52°F

11°C

Humidity 87%
Wind Speed ENE 13 MPH
Barometer 29.84 in (1010.5 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 01 Jan 05:20 AM PST
Extended Forecast for

Napa CA

Coastal Flood Advisory January 1, 05:32am until January 4, 02:00pm
Click here for hazard details and duration
Coastal Flood Advisory
  •  
    Coastal Flood Advisory January 1, 05:32am until January 4, 02:00pm

    NOW until 2:00pm Sun

    Coastal Flood Advisory

  • Overnight

    Low: 50 °F

    Showers

  • New Year's Day

    New Year's Day: Showers. High near 56. East wind 6 to 10 mph becoming south in the afternoon. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 56 °F

    Showers

  • Thursday Night

    Thursday Night: Showers, mainly before 10pm. Low around 50. Southeast wind around 7 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 50 °F

    Showers then
    Chance
    Showers

  • Friday

    Friday: A 50 percent chance of showers, mainly after 10am. Cloudy, with a high near 56. Light east southeast wind becoming southeast 5 to 10 mph in the morning. Winds could gust as high as 18 mph. New precipitation amounts of less than a tenth of an inch possible.

    High: 56 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Showers. Low around 52. South southeast wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 52 °F

    Showers

  • Saturday

    Saturday: Showers before 10am, then showers and possibly a thunderstorm between 10am and 1pm, then showers after 1pm. High near 56. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 56 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 51. Chance of precipitation is 100%.

    Low: 51 °F

    Showers

  • Sunday

    Sunday: Showers, with thunderstorms also possible after 10am. Cloudy, with a high near 54.

    High: 54 °F

    Showers

Detailed Forecast

Overnight
Showers. Steady temperature around 50. East wind around 14 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
New Year's Day
Showers. High near 56. East wind 6 to 10 mph becoming south in the afternoon. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Showers, mainly before 10pm. Low around 50. Southeast wind around 7 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday
A 50 percent chance of showers, mainly after 10am. Cloudy, with a high near 56. Light east southeast wind becoming southeast 5 to 10 mph in the morning. Winds could gust as high as 18 mph. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Showers. Low around 52. South southeast wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Saturday
Showers before 10am, then showers and possibly a thunderstorm between 10am and 1pm, then showers after 1pm. High near 56. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Showers and possibly a thunderstorm. Low around 51. Chance of precipitation is 100%.
Sunday
Showers, with thunderstorms also possible after 10am. Cloudy, with a high near 54.
Sunday Night
Showers. Cloudy, with a low around 47.
Monday
Showers. Mostly cloudy, with a high near 53.
Monday Night
Showers likely. Patchy fog. Otherwise, mostly cloudy, with a low around 44.
Tuesday
A chance of showers. Patchy fog. Otherwise, partly sunny, with a high near 54.
Tuesday Night
A slight chance of showers. Patchy fog. Otherwise, mostly cloudy, with a low around 39.
Wednesday
A slight chance of showers. Patchy fog. Otherwise, partly sunny, with a high near 52.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Napa CA
 38.29°N 122.29°W (Elev. 20 ft)
Last Update:
1:25 am PST Jan 1, 2026
Forecast Valid:
5am PST Jan 1, 2026-6pm PST Jan 7, 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