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.

Overcast

56°F

13°C

Humidity 93%
Wind Speed E 8 MPH
Barometer 29.93 in (1013.55 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 01 Jan 04:54 PM PST
Extended Forecast for

2 Miles SE Lake Berryessa CA

Wind Advisory January 2, 01:00pm until January 3, 01:00pm
Click here for hazard details and duration
Wind Advisory

  • New Year's Day

    New Year's Day: A 40 percent chance of rain. Cloudy, with a high near 57. South southeast wind around 10 mph, with gusts as high as 20 mph.

    High: 57 °F

    Chance Rain

  • Tonight

    Tonight: Rain likely, mainly between 8pm and 1am. Cloudy, with a steady temperature around 55. South southeast wind 8 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 55 °F

    Rain Likely

  • Friday

    Friday: Rain, mainly after 4pm. Steady temperature around 53. Southeast wind 7 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 53 °F

    Mostly Cloudy
    then Rain

  • Friday Night

    Friday Night: Rain. Low around 53. South southeast wind 17 to 21 mph, with gusts as high as 34 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 53 °F

    Rain

  • Saturday

    Saturday: Rain before 1pm, then showers and possibly a thunderstorm between 1pm and 4pm, then rain and possibly a thunderstorm after 4pm. High near 57. South wind 15 to 20 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 57 °F

    Showers

  • Saturday Night

    Saturday Night: Rain. Low around 51. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 51 °F

    Rain

  • Sunday

    Sunday: Rain. High near 55. Chance of precipitation is 100%.

    High: 55 °F

    Rain

  • Sunday Night

    Sunday Night: Rain. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Rain

  • Monday

    Monday: Rain likely. Mostly cloudy, with a high near 50.

    High: 50 °F

    Rain Likely

Detailed Forecast

New Year's Day
A 40 percent chance of rain. Cloudy, with a high near 57. South southeast wind around 10 mph, with gusts as high as 20 mph.
Tonight
Rain likely, mainly between 8pm and 1am. Cloudy, with a steady temperature around 55. South southeast wind 8 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Rain, mainly after 4pm. Steady temperature around 53. Southeast wind 7 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Rain. Low around 53. South southeast wind 17 to 21 mph, with gusts as high as 34 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Saturday
Rain before 1pm, then showers and possibly a thunderstorm between 1pm and 4pm, then rain and possibly a thunderstorm after 4pm. High near 57. South wind 15 to 20 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
Rain. Low around 51. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Rain. High near 55. Chance of precipitation is 100%.
Sunday Night
Rain. Mostly cloudy, with a low around 48.
Monday
Rain likely. Mostly cloudy, with a high near 50.
Monday Night
A chance of rain, mainly before 4am. Mostly cloudy, with a low around 46.
Tuesday
A slight chance of rain. Partly sunny, with a high near 53.
Tuesday Night
A slight chance of rain. Mostly cloudy, with a low around 44.
Wednesday
A chance of rain. Partly sunny, with a high near 52.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 42.
Thursday
A chance of rain. Mostly sunny, with a high near 50.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SE Lake Berryessa CA
 38.55°N 122.21°W (Elev. 440 ft)
Last Update:
12:32 pm PST Jan 1, 2026
Forecast Valid:
5pm PST Jan 1, 2026-6pm PST Jan 8, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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