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

88°F

31°C

Humidity 20%
Wind Speed SW 6 MPH
Barometer 30.02 in (1016.59 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 16 Oct 03:35 PM PDT
Extended Forecast for

4 Miles E Saint Helena CA

  • Tonight

    Tonight: Mostly clear, with a low around 52. Calm wind.

    Low: 52 °F

    Mostly Clear

  • Saturday

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

    High: 89 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 48. Calm wind.

    Low: 48 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 78. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 78 °F

    Sunny

  • Sunday Night

    Sunday Night: Patchy fog after 9pm. Otherwise, partly cloudy, with a low around 44. Southwest wind around 6 mph becoming calm in the evening.

    Low: 44 °F

    Patchy Fog

  • Monday

    Monday: Areas of fog before 8am. Otherwise, partly sunny, with a high near 66.

    High: 66 °F

    Areas Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: A 30 percent chance of showers after 11pm. Patchy fog between 9pm and 11pm. Otherwise, mostly cloudy, with a low around 44.

    Low: 44 °F

    Chance
    Showers and
    Patchy Fog

  • Tuesday

    Tuesday: A chance of showers, mainly before 11am. Partly sunny, with a high near 67.

    High: 67 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A slight chance of showers before 11pm. Partly cloudy, with a low around 44.

    Low: 44 °F

    Slight Chance
    Showers then
    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 52. Calm wind.
Saturday
Sunny, with a high near 89. Calm wind becoming west southwest around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 48. Calm wind.
Sunday
Sunny, with a high near 78. Calm wind becoming southwest around 6 mph in the afternoon.
Sunday Night
Patchy fog after 9pm. Otherwise, partly cloudy, with a low around 44. Southwest wind around 6 mph becoming calm in the evening.
Monday
Areas of fog before 8am. Otherwise, partly sunny, with a high near 66.
Monday Night
A 30 percent chance of showers after 11pm. Patchy fog between 9pm and 11pm. Otherwise, mostly cloudy, with a low around 44.
Tuesday
A chance of showers, mainly before 11am. Partly sunny, with a high near 67.
Tuesday Night
A slight chance of showers before 11pm. Partly cloudy, with a low around 44.
Wednesday
A slight chance of showers before 11am. Mostly sunny, with a high near 70.
Wednesday Night
Partly cloudy, with a low around 46.
Thursday
Mostly sunny, with a high near 70.
Thursday Night
Mostly clear, with a low around 44.
Friday
Sunny, with a high near 71.
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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:
2:31 pm PDT Oct 16, 2026
Forecast Valid:
3pm PDT Oct 16, 2026-6pm PDT Oct 23, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation