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

Napa, Napa County Airport (KAPC)

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

Clear

48°F

9°C

Humidity 66%
Wind Speed N 0 MPH
Barometer 30.08 in (1018.63 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 17 Oct 08:00 AM PDT
Extended Forecast for

5 Miles E Saint Helena CA

  • Today

    Today: Sunny, with a high near 89. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 89 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 50. Calm wind.

    Low: 50 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 77. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 77 °F

    Sunny

  • Sunday Night

    Sunday Night: Patchy fog after 10pm. Otherwise, increasing clouds, with a low around 44. Southwest wind around 6 mph becoming calm in the evening.

    Low: 44 °F

    Patchy Fog

  • Monday

    Monday: Patchy fog before 8am. Otherwise, partly sunny, with a high near 66. Calm wind becoming west southwest 5 to 7 mph in the afternoon.

    High: 66 °F

    Patchy Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: A 20 percent chance of showers. Areas of fog before 10am. Otherwise, mostly cloudy, with a high near 67.

    High: 67 °F

    Slight Chance
    Showers and
    Areas Fog

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 47.

    Low: 47 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 70.

    High: 70 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 89. Calm wind becoming southwest around 5 mph in the afternoon.
Tonight
Mostly clear, with a low around 50. Calm wind.
Sunday
Sunny, with a high near 77. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Sunday Night
Patchy fog after 10pm. Otherwise, increasing clouds, with a low around 44. Southwest wind around 6 mph becoming calm in the evening.
Monday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 66. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Monday Night
Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 45.
Tuesday
A 20 percent chance of showers. Areas of fog before 10am. Otherwise, mostly cloudy, with a high near 67.
Tuesday Night
Mostly cloudy, with a low around 47.
Wednesday
Partly sunny, with a high near 70.
Wednesday Night
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 46.
Thursday
Areas of fog. Otherwise, partly sunny, with a high near 68.
Thursday Night
Patchy fog. Otherwise, mostly clear, with a low around 44.
Friday
Areas of fog. Otherwise, sunny, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles E Saint Helena CA
 38.48°N 122.36°W (Elev. 499 ft)
Last Update:
2:36 am PDT Oct 17, 2026
Forecast Valid:
8am PDT Oct 17, 2026-6pm PDT Oct 23, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation