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.

Overcast

55°F

13°C

Humidity 82%
Wind Speed WSW 9 MPH
Barometer 29.98 in (1015.24 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 19 Oct 01:15 AM PDT
Extended Forecast for

4 Miles E Saint Helena CA

  • Overnight

    Overnight: Areas of fog. Otherwise, mostly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Areas Fog

  • Monday

    Monday: Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 66. Calm wind becoming west southwest around 6 mph in the morning.

    High: 66 °F

    Patchy Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Patchy fog after 10pm. Otherwise, cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Patchy Fog

  • Tuesday

    Tuesday: Areas of fog before 11am. Otherwise, cloudy, with a high near 66. Calm wind.

    High: 66 °F

    Areas Fog
    then Cloudy

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers. Patchy fog after 4am. Otherwise, cloudy, with a low around 46. Calm wind.

    Low: 46 °F

    Chance
    Showers and
    Patchy Fog

  • Wednesday

    Wednesday: A 50 percent chance of showers. Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 68. New precipitation amounts of less than a tenth of an inch possible.

    High: 68 °F

    Chance
    Showers and
    Areas Fog

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers. Areas of fog after 8pm. Otherwise, mostly cloudy, with a low around 45.

    Low: 45 °F

    Chance
    Showers and
    Areas Fog

  • Thursday

    Thursday: A chance of showers before 11am. Areas of fog before 1pm. Otherwise, partly sunny, with a high near 68.

    High: 68 °F

    Chance
    Showers and
    Areas Fog
    then Patchy
    Fog

  • Thursday Night

    Thursday Night: Areas of fog after 8pm. Otherwise, partly cloudy, with a low around 42.

    Low: 42 °F

    Areas Fog

Detailed Forecast

Overnight
Areas of fog. Otherwise, mostly cloudy, with a low around 42. Calm wind.
Monday
Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 66. Calm wind becoming west southwest around 6 mph in the morning.
Monday Night
Patchy fog after 10pm. Otherwise, cloudy, with a low around 42. Calm wind.
Tuesday
Areas of fog before 11am. Otherwise, cloudy, with a high near 66. Calm wind.
Tuesday Night
A 30 percent chance of showers. Patchy fog after 4am. Otherwise, cloudy, with a low around 46. Calm wind.
Wednesday
A 50 percent chance of showers. Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 68. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
A 40 percent chance of showers. Areas of fog after 8pm. Otherwise, mostly cloudy, with a low around 45.
Thursday
A chance of showers before 11am. Areas of fog before 1pm. Otherwise, partly sunny, with a high near 68.
Thursday Night
Areas of fog after 8pm. Otherwise, partly cloudy, with a low around 42.
Friday
Areas of fog before 8am. Otherwise, sunny, with a high near 70.
Friday Night
Mostly clear, with a low around 42.
Saturday
Sunny, with a high near 70.
Saturday Night
A slight chance of rain. Partly cloudy, with a low around 43.
Sunday
A slight chance of rain. Mostly sunny, with a high near 69.
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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:
1:26 am PDT Oct 19, 2026
Forecast Valid:
1am PDT Oct 19, 2026-6pm PDT Oct 25, 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