Dangerous Heat in the Southwest; Severe Thunderstorms and Heavy Rain in the Northeast and Mid-Atlantic

Dangerous heat will persist across the Southwest U.S. through Friday with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week. Strong to severe thunderstorms may produce damaging wind, hail, a tornado or two, heavy rain and flash flooding across parts of the Mid-Atlantic and Northeast. Heavy rainfall threat continues across the Gulf Coast. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

72°F

22°C

Humidity 68%
Wind Speed SSW 5 MPH
Barometer 29.97 in (1014.9 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 27 Aug 10:35 AM PDT
Extended Forecast for

4 Miles NW Lake Berryessa CA

  • Today

    Today: Mostly sunny, with a high near 90. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.

    High: 90 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 64. West southwest wind 5 to 9 mph becoming light south southwest  after midnight.

    Low: 64 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of showers before 11am.  Cloudy, with a high near 82. Light south southwest wind becoming southwest 5 to 9 mph in the afternoon.

    High: 82 °F

    Slight Chance
    Showers then
    Cloudy

  • Friday Night

    Friday Night: Cloudy during the early evening, then gradual clearing, with a low around 58. West southwest wind 8 to 13 mph becoming light south southwest  in the evening.

    Low: 58 °F

    Gradual
    Clearing

  • Saturday

    Saturday: Sunny, with a high near 82. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 58.

    Low: 58 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 55.

    Low: 55 °F

    Clear

  • Monday

    Monday: Patchy fog before 11am.  Otherwise, sunny, with a high near 75.

    High: 75 °F

    Patchy Fog
    then Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 90. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Tonight
Mostly cloudy, with a low around 64. West southwest wind 5 to 9 mph becoming light south southwest after midnight.
Friday
A 20 percent chance of showers before 11am. Cloudy, with a high near 82. Light south southwest wind becoming southwest 5 to 9 mph in the afternoon.
Friday Night
Cloudy during the early evening, then gradual clearing, with a low around 58. West southwest wind 8 to 13 mph becoming light south southwest in the evening.
Saturday
Sunny, with a high near 82. Calm wind becoming south southwest around 6 mph in the afternoon.
Saturday Night
Clear, with a low around 58.
Sunday
Sunny, with a high near 82.
Sunday Night
Clear, with a low around 55.
Monday
Patchy fog before 11am. Otherwise, sunny, with a high near 75.
Monday Night
Mostly clear, with a low around 53.
Tuesday
Areas of fog. Otherwise, sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 55.
Wednesday
Patchy fog. Otherwise, sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NW Lake Berryessa CA
 38.63°N 122.29°W (Elev. 443 ft)
6:47 am PDT Aug 27, 2026
10am PDT Aug 27, 2026-6pm PDT Sep 2, 2026
 
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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