Severe Thunderstorms and Heavy Rain Across the Ohio Valley;

Severe thunderstorms with damaging wind gusts will be possible from the mid-Mississippi Valley into parts of the Ohio Valley and central Appalachians. Heavy rain associated with these storms may lead to considerable flash and urban flooding impacts across portions of the Ohio Valley. Mid-summer heat persists from the Central Plains to the Southeast. 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 60%
Wind Speed SSW 17 MPH
Barometer 29.95 in (1014.22 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 11 Aug 02:35 PM PDT
Extended Forecast for

4 Miles E Saint Helena CA

Coastal Flood Advisory August 11, 02:55pm until August 13, 02:00am
Click here for hazard details and duration
Coastal Flood Advisory
  •  
    Coastal Flood Advisory August 11, 02:55pm until August 13, 02:00am

    NOW until 2:00am Thu

    Coastal Flood Advisory

  • This Afternoon

    High: 86 °F

    Sunny

  • Tonight

    Tonight: Areas of fog after 11pm.  Otherwise, increasing clouds, with a low around 51. Calm wind.

    Low: 51 °F

    Areas Fog

  • Wednesday

    Wednesday: Areas of fog before 10am.  Otherwise, cloudy through mid morning, then gradual clearing, with a high near 82. Calm wind becoming south around 6 mph in the afternoon.

    High: 82 °F

    Areas Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog after 11pm.  Otherwise, increasing clouds, with a low around 51. South wind around 5 mph becoming calm  in the evening.

    Low: 51 °F

    Patchy Fog

  • Thursday

    Thursday: Areas of fog before 8am.  Otherwise, partly sunny, with a high near 72. Calm wind becoming south around 6 mph in the afternoon.

    High: 72 °F

    Areas Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Areas of fog after 11pm.  Otherwise, partly cloudy, with a low around 49.

    Low: 49 °F

    Areas Fog

  • Friday

    Friday: Areas of fog before 11am.  Otherwise, partly sunny, with a high near 75.

    High: 75 °F

    Areas Fog
    then Sunny

  • Friday Night

    Friday Night: Areas of fog after 11pm.  Otherwise, mostly clear, with a low around 48.

    Low: 48 °F

    Areas Fog

Detailed Forecast

This Afternoon
Sunny, with a high near 86. South wind around 6 mph.
Tonight
Areas of fog after 11pm. Otherwise, increasing clouds, with a low around 51. Calm wind.
Wednesday
Areas of fog before 10am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 82. Calm wind becoming south around 6 mph in the afternoon.
Wednesday Night
Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 51. South wind around 5 mph becoming calm in the evening.
Thursday
Areas of fog before 8am. Otherwise, partly sunny, with a high near 72. Calm wind becoming south around 6 mph in the afternoon.
Thursday Night
Areas of fog after 11pm. Otherwise, partly cloudy, with a low around 49.
Friday
Areas of fog before 11am. Otherwise, partly sunny, with a high near 75.
Friday Night
Areas of fog after 11pm. Otherwise, mostly clear, with a low around 48.
Saturday
Areas of fog before 11am. Otherwise, mostly sunny, with a high near 79.
Saturday Night
Patchy fog after 9pm. Otherwise, partly cloudy, with a low around 48.
Sunday
Areas of fog. Otherwise, partly sunny, with a high near 80.
Sunday Night
Patchy fog. Otherwise, partly cloudy, with a low around 50.
Monday
Areas of fog. Otherwise, mostly cloudy, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Saint Helena CA
 38.5°N 122.4°W (Elev. 476 ft)
1:26 pm PDT Aug 11, 2026
2pm PDT Aug 11, 2026-6pm PDT Aug 17, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database