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

Tropical Storm Arthur and Heavy Rainfall in the South; Severe Weather in the Midwest

An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana tonight. Intense tornadoes, swaths of damaging gusts, and hail in excess of 2 inches in diameter possible. Tropical Storm Arthur will continue to produce strong winds across coastal Upper Texas and Louisiana tonight, as well as potentially life-threatening flooding across southern Louisiana into Mississippi. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Overcast

59°F

15°C

Humidity 82%
Wind Speed W 14 MPH
Barometer 29.89 in (1012.19 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 18 Jun 01:20 AM PDT
Extended Forecast for

4 Miles NNE Lake Berryessa CA

  • Overnight

    Overnight: Mostly clear, with a low around 57. Southwest wind 5 to 7 mph.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 78. Light west southwest wind becoming southwest 6 to 11 mph in the morning. Winds could gust as high as 21 mph.

    High: 78 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 55. West southwest wind 7 to 14 mph, with gusts as high as 23 mph.

    Low: 55 °F

    Mostly Clear

  • Juneteenth

    Juneteenth: Sunny, with a high near 71. Southwest wind 6 to 10 mph, with gusts as high as 20 mph.

    High: 71 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 52. West southwest wind 5 to 14 mph, with gusts as high as 24 mph.

    Low: 52 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 56.

    Low: 56 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 83.

    High: 83 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 60.

    Low: 60 °F

    Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 57. Southwest wind 5 to 7 mph.
Thursday
Sunny, with a high near 78. Light west southwest wind becoming southwest 6 to 11 mph in the morning. Winds could gust as high as 21 mph.
Thursday Night
Mostly clear, with a low around 55. West southwest wind 7 to 14 mph, with gusts as high as 23 mph.
Juneteenth
Sunny, with a high near 71. Southwest wind 6 to 10 mph, with gusts as high as 20 mph.
Friday Night
Mostly clear, with a low around 52. West southwest wind 5 to 14 mph, with gusts as high as 24 mph.
Saturday
Sunny, with a high near 76.
Saturday Night
Clear, with a low around 56.
Sunday
Sunny, with a high near 83.
Sunday Night
Clear, with a low around 60.
Monday
Sunny, with a high near 86.
Monday Night
Clear, with a low around 60.
Tuesday
Sunny, with a high near 88.
Tuesday Night
Clear, with a low around 62.
Wednesday
Sunny, with a high near 90.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNE Lake Berryessa CA
 38.64°N 122.2°W (Elev. 1463 ft)
Last Update:
1:26 am PDT Jun 18, 2026
Forecast Valid:
1am PDT Jun 18, 2026-6pm PDT Jun 24, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation