Severe Weather and Heavy Rain from the Ohio Valley to the Mid-Atlantic; Heat Persists in the South-Central U.S.

Widespread strong thunderstorms with damaging winds and locally heavy rain are expected across portions of the Ohio Valley into southern Mid-Atlantic and Carolinas. Rounds of strong thunderstorms are expected to develop across the northern and central Plains. Sweltering heat remains most persistent across the South-Central Plains and Lower/Middle Mississippi Valley through next week. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

58°F

14°C

Humidity 86%
Wind Speed N 0 MPH
Barometer 29.97 in (1014.9 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 05 Sep 08:54 AM PDT
Extended Forecast for

4 Miles E Saint Helena CA

  • Today

    Today: Sunny, with a high near 77. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 77 °F

    Sunny

  • Tonight

    Tonight: Areas of fog after 2am.  Otherwise, partly cloudy, with a low around 49. Calm wind.

    Low: 49 °F

    Mostly Clear
    then Areas
    Fog

  • Sunday

    Sunday: Areas of fog before 9am.  Otherwise, partly sunny, then gradually becoming sunny, with a high near 78. Calm wind becoming west southwest 5 to 7 mph in the afternoon.

    High: 78 °F

    Areas Fog
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 50. West southwest wind around 5 mph becoming calm  in the evening.

    Low: 50 °F

    Mostly Clear

  • Labor Day

    Labor Day: Sunny, with a high near 85. Calm wind becoming north northeast around 5 mph.

    High: 85 °F

    Sunny

  • Monday Night

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

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of rain before 11pm.  Partly cloudy, with a low around 58.

    Low: 58 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 89.

    High: 89 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 77. Calm wind becoming southwest around 6 mph in the afternoon.
Tonight
Areas of fog after 2am. Otherwise, partly cloudy, with a low around 49. Calm wind.
Sunday
Areas of fog before 9am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 78. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 50. West southwest wind around 5 mph becoming calm in the evening.
Labor Day
Sunny, with a high near 85. Calm wind becoming north northeast around 5 mph.
Monday Night
Mostly clear, with a low around 54.
Tuesday
Mostly sunny, with a high near 88.
Tuesday Night
A slight chance of rain before 11pm. Partly cloudy, with a low around 58.
Wednesday
Partly sunny, with a high near 89.
Wednesday Night
Partly cloudy, with a low around 62.
Thursday
Mostly sunny, with a high near 89.
Thursday Night
Partly cloudy, with a low around 58.
Friday
Mostly sunny, with a high near 81.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Saint Helena CA
 38.5°N 122.4°W (Elev. 476 ft)
8:21 am PDT Sep 5, 2026
9am PDT Sep 5, 2026-6pm PDT Sep 11, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

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