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

Extreme Heat and Excessive Rainfall Today

Dangerous and extreme heat will remain across portions of the southern U.S. through the weekend. A heat wave over the Southwest U.S. will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Multiple rounds of thunderstorms will produce heavy to excessive rainfall with significant flash flooding across portions of southern New England. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

79°F

26°C

Humidity 47%
Wind Speed SSW 16 MPH
Barometer 29.85 in (1010.84 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 29 Jul 03:20 PM PDT
Extended Forecast for

3 Miles NNW Lake Berryessa CA

  • Tonight

    Tonight: Clear, with a low around 62. West southwest wind 5 to 8 mph becoming calm in the evening.

    Low: 62 °F

    Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 99. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: Clear, with a low around 61. West southwest wind 5 to 7 mph becoming calm in the evening.

    Low: 61 °F

    Clear

  • Friday

    Friday: Sunny and hot, with a high near 101. Calm wind.

    High: 101 °F

    Hot

  • Friday Night

    Friday Night: Clear, with a low around 64. Southwest wind 5 to 7 mph becoming calm in the evening.

    Low: 64 °F

    Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 103.

    High: 103 °F

    Hot

  • Saturday Night

    Saturday Night: Clear, with a low around 66.

    Low: 66 °F

    Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 102.

    High: 102 °F

    Hot

  • Sunday Night

    Sunday Night: Clear, with a low around 65.

    Low: 65 °F

    Clear

Detailed Forecast

Tonight
Clear, with a low around 62. West southwest wind 5 to 8 mph becoming calm in the evening.
Thursday
Sunny and hot, with a high near 99. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Thursday Night
Clear, with a low around 61. West southwest wind 5 to 7 mph becoming calm in the evening.
Friday
Sunny and hot, with a high near 101. Calm wind.
Friday Night
Clear, with a low around 64. Southwest wind 5 to 7 mph becoming calm in the evening.
Saturday
Sunny and hot, with a high near 103.
Saturday Night
Clear, with a low around 66.
Sunday
Sunny and hot, with a high near 102.
Sunday Night
Clear, with a low around 65.
Monday
Sunny and hot, with a high near 102.
Monday Night
Clear, with a low around 66.
Tuesday
Sunny and hot, with a high near 100.
Tuesday Night
Clear, with a low around 62.
Wednesday
Sunny and hot, with a high near 98.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Lake Berryessa CA
 38.61°N 122.28°W (Elev. 554 ft)
Last Update:
1:25 pm PDT Jul 29, 2026
Forecast Valid:
3pm PDT Jul 29, 2026-6pm PDT Aug 5, 2026
 
Forecast Discussion
 
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Additional Resources

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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