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

Extreme Heat and Severe Thunderstorms Today

Extreme heat continues today from the central Plains to the lower Mississippi River Valley, over southeast Montana, and from southern California into the Southwest Deserts. Extreme Heat Warnings remain in effect. Severe thunderstorms capable of strong to severe wind gusts and large hail are possible across the Great Lakes into the Ohio Valley today into tonight. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

78°F

26°C

Humidity 52%
Wind Speed SSW 16 MPH
Barometer 29.96 in (1014.56 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 27 Jul 03:54 PM PDT
Extended Forecast for

4 Miles E Saint Helena CA

  • Tonight

    Tonight: Mostly clear. West wind around 6 mph becoming calm in the evening.

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 92. Calm wind becoming west southwest around 6 mph in the afternoon.

    High: 92 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 57. West southwest wind around 5 mph becoming calm in the evening.

    Low: 57 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 94. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 94 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57. Southwest wind around 6 mph becoming calm in the evening.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 57.

    Low: 57 °F

    Clear

  • Friday

    Friday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Friday Night

    Friday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear. West wind around 6 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 92. Calm wind becoming west southwest around 6 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 57. West southwest wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 94. Calm wind becoming southwest around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 57. Southwest wind around 6 mph becoming calm in the evening.
Thursday
Sunny, with a high near 94.
Thursday Night
Clear, with a low around 57.
Friday
Sunny and hot, with a high near 97.
Friday Night
Mostly clear, with a low around 58.
Saturday
Sunny and hot, with a high near 100.
Saturday Night
Clear, with a low around 60.
Sunday
Sunny and hot, with a high near 99.
Sunday Night
Clear, with a low around 59.
Monday
Sunny and hot, with a high near 96.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Saint Helena CA
 38.5°N 122.4°W (Elev. 476 ft)
Last Update:
1:25 pm PDT Jul 27, 2026
Forecast Valid:
4pm PDT Jul 27, 2026-6pm PDT Aug 3, 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