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

Heavy Rain and Flooding Concerns in Hawaii; Severe Weather in the Plains

A storm system is expected to bring strong winds, widespread heavy rainfall, and flooding concerns to the Hawaiian Islands through the weekend. Strong to severe thunderstorms are forecast from the Southern Plains to the Mid-Missouri Valley this afternoon and evening. Large hail and strong winds are the primary threats. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

70°F

21°C

Humidity 64%
Wind Speed S 11 MPH
Barometer 29.89 in (1012.19 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 09 Apr 05:00 PM PDT
Extended Forecast for

Lake Berryessa CA

  • Tonight

    Tonight: A 30 percent chance of showers after 3am. Areas of fog after 4am. Otherwise, increasing clouds, with a low around 52. West southwest wind 5 to 7 mph becoming calm in the evening. New precipitation amounts of less than a tenth of an inch possible.

    Low: 52 °F

    Partly Cloudy
    then Chance
    Showers and
    Areas Fog

  • Friday

    Friday: Showers likely, then showers and possibly a thunderstorm after 11am. Patchy fog before 10am. High near 62. Calm wind becoming south southwest 5 to 8 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 62 °F

    Showers and
    Patchy Fog

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 52. South southwest wind 5 to 8 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 52 °F

    Showers

  • Saturday

    Saturday: Showers likely, then showers and possibly a thunderstorm after 11am. High near 56. South wind 5 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 56 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before 8pm, then showers between 8pm and 2am, then showers and possibly a thunderstorm after 2am. Low around 46. South wind 5 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 46 °F

    Showers

  • Sunday

    Sunday: Showers, with thunderstorms also possible after 11am. High near 55. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 55 °F

    Showers

  • Sunday Night

    Sunday Night: A 40 percent chance of rain before 11pm. Partly cloudy, with a low around 43.

    Low: 43 °F

    Chance Rain
    then Partly
    Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 62.

    High: 62 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear

Detailed Forecast

Tonight
A 30 percent chance of showers after 3am. Areas of fog after 4am. Otherwise, increasing clouds, with a low around 52. West southwest wind 5 to 7 mph becoming calm in the evening. New precipitation amounts of less than a tenth of an inch possible.
Friday
Showers likely, then showers and possibly a thunderstorm after 11am. Patchy fog before 10am. High near 62. Calm wind becoming south southwest 5 to 8 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers and possibly a thunderstorm. Low around 52. South southwest wind 5 to 8 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers likely, then showers and possibly a thunderstorm after 11am. High near 56. South wind 5 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
Showers and possibly a thunderstorm before 8pm, then showers between 8pm and 2am, then showers and possibly a thunderstorm after 2am. Low around 46. South wind 5 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
Showers, with thunderstorms also possible after 11am. High near 55. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
A 40 percent chance of rain before 11pm. Partly cloudy, with a low around 43.
Monday
Mostly sunny, with a high near 62.
Monday Night
Mostly clear, with a low around 44.
Tuesday
Sunny, with a high near 67.
Tuesday Night
Mostly clear, with a low around 45.
Wednesday
Mostly sunny, with a high near 70.
Wednesday Night
Partly cloudy, with a low around 49.
Thursday
Mostly sunny, with a high near 71.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lake Berryessa CA
 38.57°N 122.24°W (Elev. 732 ft)
Last Update:
4:46 pm PDT Apr 9, 2026
Forecast Valid:
5pm PDT Apr 9, 2026-6pm PDT Apr 16, 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