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 >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Partly Cloudy

43°F

6°C

Humidity 86%
Wind Speed E 16 MPH
Barometer 30.26 in (1024.72 mb)
Dewpoint 39°F (4°C)
Visibility 8.00 mi
Wind Chill35°F (2°C)
Last update 30 Dec 10:35 AM PST
Extended Forecast for

2 Miles SE Lake Berryessa CA

  • Today

    Today: Patchy fog before 11am. Otherwise, partly sunny, with a high near 53. East southeast wind 3 to 5 mph.

    High: 53 °F

    Patchy Fog
    then Partly
    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 45. North wind 3 to 6 mph.

    Low: 45 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Rain, mainly after 4pm. Patchy fog between 11am and 5pm. Steady temperature around 48. Light northeast wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 48 °F

    Chance Rain
    and Patchy
    Fog then Rain
    and Patchy
    Fog

  • Wednesday Night

    Wednesday Night: Rain. Patchy fog before 10pm. Low around 48. East wind 5 to 10 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 48 °F

    Rain and
    Patchy Fog

  • New Year's Day

    New Year's Day: Rain. Patchy fog. High near 56. South wind around 8 mph. 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 and possibly a thunderstorm after 4am. Areas of fog. Low around 53. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 53 °F

    Showers and
    Areas Fog

  • Friday

    Friday: Showers and possibly a thunderstorm before 10am, then rain after 10am. Patchy fog before 7am. High near 56. Chance of precipitation is 80%.

    High: 56 °F

    Showers and
    Patchy Fog

  • Friday Night

    Friday Night: Rain. Patchy fog after 1am. Otherwise, cloudy, with a low around 48.

    Low: 48 °F

    Rain and
    Patchy Fog

  • Saturday

    Saturday: Rain likely. Patchy fog before 4pm. Otherwise, mostly cloudy, with a high near 52.

    High: 52 °F

    Rain Likely
    and Patchy
    Fog

Detailed Forecast

Today
Patchy fog before 11am. Otherwise, partly sunny, with a high near 53. East southeast wind 3 to 5 mph.
Tonight
Mostly cloudy, with a low around 45. North wind 3 to 6 mph.
Wednesday
Rain, mainly after 4pm. Patchy fog between 11am and 5pm. Steady temperature around 48. Light northeast wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Rain. Patchy fog before 10pm. Low around 48. East wind 5 to 10 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
New Year's Day
Rain. Patchy fog. High near 56. South wind around 8 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Rain before 4am, then showers and possibly a thunderstorm after 4am. Areas of fog. Low around 53. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
Showers and possibly a thunderstorm before 10am, then rain after 10am. Patchy fog before 7am. High near 56. Chance of precipitation is 80%.
Friday Night
Rain. Patchy fog after 1am. Otherwise, cloudy, with a low around 48.
Saturday
Rain likely. Patchy fog before 4pm. Otherwise, mostly cloudy, with a high near 52.
Saturday Night
Rain likely. Patchy fog. Otherwise, mostly cloudy, with a low around 46.
Sunday
A chance of rain. Areas of fog. Otherwise, mostly cloudy, with a high near 52.
Sunday Night
Rain likely. Patchy fog. Otherwise, mostly cloudy, with a low around 46.
Monday
Rain likely. Areas of fog. Otherwise, mostly cloudy, with a high near 53.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SE Lake Berryessa CA
 38.55°N 122.21°W (Elev. 440 ft)
Last Update:
12:27 am PST Dec 30, 2025
Forecast Valid:
10am 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