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

Significant Coastal Impacts to the Eastern Seaboard; Tropical Storm Nolo to Impact Hawaii

A Nor'easter will bring significant coastal impacts to the Mid-Atlantic and New England through the weekend. Moderate to major coastal flooding, heavy rain, strong winds and high surf expected. Tropical Storm Nolo will continue to strengthen as it moves north toward the Big Island of Hawaii. Heavy rainfall may bring life-threatening, catastrophic flooding and mudslides through the weekend. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

64°F

18°C

Humidity 59%
Wind Speed SW 8 MPH
Barometer 29.9 in (1012.53 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 24 Sep 10:35 PM PDT
Extended Forecast for

4 Miles SE Saint Helena CA

  • Tonight

    Tonight: Mostly cloudy, with a low around 56. Southwest wind around 6 mph becoming calm after midnight.

    Low: 56 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 83. Light and variable wind becoming west around 6 mph in the morning.

    High: 83 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 50. Calm wind.

    Low: 50 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Cloudy, then gradually becoming mostly sunny, with a high near 80. Light and variable wind.

    High: 80 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 49. Light and variable wind.

    Low: 49 °F

    Partly Cloudy
    then Patchy
    Fog

  • Sunday

    Sunday: Areas of fog before 9am. Otherwise, mostly sunny, with a high near 76.

    High: 76 °F

    Areas Fog
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 48.

    Low: 48 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Monday Night

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

    Low: 54 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 56. Southwest wind around 6 mph becoming calm after midnight.
Friday
Mostly sunny, with a high near 83. Light and variable wind becoming west around 6 mph in the morning.
Friday Night
Increasing clouds, with a low around 50. Calm wind.
Saturday
Cloudy, then gradually becoming mostly sunny, with a high near 80. Light and variable wind.
Saturday Night
Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 49. Light and variable wind.
Sunday
Areas of fog before 9am. Otherwise, mostly sunny, with a high near 76.
Sunday Night
Mostly clear, with a low around 48.
Monday
Sunny, with a high near 82.
Monday Night
Mostly clear, with a low around 54.
Tuesday
Sunny, with a high near 89.
Tuesday Night
Clear, with a low around 55.
Wednesday
Sunny, with a high near 91.
Wednesday Night
Mostly clear, with a low around 54.
Thursday
Mostly sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SE Saint Helena CA
 38.45°N 122.41°W (Elev. 157 ft)
Last Update:
8:17 pm PDT Sep 24, 2026
Forecast Valid:
10pm PDT Sep 24, 2026-6pm PDT Oct 1, 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