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

Flooding Threat Along the Gulf Coast, Southern Rockies and High Plains; Cooler Weather in the Central and Eastern U.S.

Strong thunderstorms may bring excessive rainfall and flooding over parts of the northern Gulf Coast today and over parts of the southern Rockies into the High Plains today through the weekend. A refreshingly cool and dry air mass will continue to produce below average temperatures across the central and eastern U.S. through the weekend. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

82°F

28°C

Humidity 34%
Wind Speed SSW 4 MPH
Barometer 29.93 in (1013.55 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 31 Aug 11:54 AM PDT
Extended Forecast for

4 Miles E Saint Helena CA

  • This Afternoon

    This Afternoon: Sunny and hot, with a high near 96. West southwest wind 5 to 9 mph.

    High: 96 °F

    Hot

  • Tonight

    Tonight: Mostly clear, with a low around 58. West wind 5 to 7 mph becoming calm in the evening.

    Low: 58 °F

    Mostly Clear

  • Labor Day

    Labor Day: Sunny and hot, with a high near 99. Calm wind becoming west southwest around 6 mph in the afternoon.

    High: 99 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 59. West wind 5 to 7 mph becoming calm in the evening.

    Low: 59 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 92. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 92 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 54.

    Low: 54 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Clear
    then Patchy
    Fog

  • Thursday

    Thursday: Patchy fog before 7am. Otherwise, mostly sunny, with a high near 91.

    High: 91 °F

    Patchy Fog
    then Sunny

Detailed Forecast

This Afternoon
Sunny and hot, with a high near 96. West southwest wind 5 to 9 mph.
Tonight
Mostly clear, with a low around 58. West wind 5 to 7 mph becoming calm in the evening.
Labor Day
Sunny and hot, with a high near 99. Calm wind becoming west southwest around 6 mph in the afternoon.
Monday Night
Mostly clear, with a low around 59. West wind 5 to 7 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 92. Calm wind becoming south 5 to 7 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 54.
Wednesday
Mostly sunny, with a high near 91.
Wednesday Night
Patchy fog after 5am. Otherwise, partly cloudy, with a low around 55.
Thursday
Patchy fog before 7am. Otherwise, mostly sunny, with a high near 91.
Thursday Night
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 54.
Friday
Areas of fog. Otherwise, mostly sunny, with a high near 88.
Friday Night
Patchy fog. Otherwise, partly cloudy, with a low around 54.
Saturday
Areas of fog. Otherwise, mostly sunny, with a high near 85.
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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:
8:09 am PDT Aug 31, 2025
Forecast Valid:
12pm PDT Aug 31, 2025-6pm PDT Sep 6, 2025
 
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