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

Hazardous Weather Conditions

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

66°F

19°C

Humidity 60%
Wind Speed SSE 6 MPH
Barometer 29.77 in (1008.13 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 08 Oct 08:54 PM PDT
Extended Forecast for

4 Miles E Saint Helena CA

Coastal Flood Advisory October 8, 09:05pm until October 14, 04:00pm
Heat Advisory October 8, 09:05pm until October 8, 10:00pm
Click here for hazard details and duration
Coastal Flood Advisory
...
  •  
    Coastal Flood Advisory October 8, 09:05pm until October 14, 04:00pm
    Heat Advisory October 8, 09:05pm until October 8, 10:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Tonight

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 90. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 90 °F

    Sunny

  • Friday Night

    Friday Night: Patchy fog after 2am. Otherwise, increasing clouds, with a low around 50. Calm wind.

    Low: 50 °F

    Mostly Clear
    then Patchy
    Fog

  • Saturday

    Saturday: Patchy fog before 11am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 71. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 71 °F

    Patchy Fog
    then Sunny

  • Saturday Night

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

    Low: 44 °F

    Patchy Fog

  • Sunday

    Sunday: Areas of fog before 8am. Otherwise, mostly sunny, with a high near 68.

    High: 68 °F

    Areas Fog
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Mostly sunny, with a high near 68.

    High: 68 °F

    Mostly Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 57. Calm wind.
Friday
Sunny, with a high near 90. Calm wind becoming south southwest around 6 mph in the afternoon.
Friday Night
Patchy fog after 2am. Otherwise, increasing clouds, with a low around 50. Calm wind.
Saturday
Patchy fog before 11am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 71. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Saturday Night
Patchy fog after 10pm. Otherwise, mostly clear, with a low around 44. Southwest wind around 6 mph becoming calm in the evening.
Sunday
Areas of fog before 8am. Otherwise, mostly sunny, with a high near 68.
Sunday Night
Mostly clear, with a low around 45.
Columbus Day
Mostly sunny, with a high near 68.
Monday Night
Patchy fog after 3am. Otherwise, mostly clear, with a low around 45.
Tuesday
Patchy fog before 9am. Otherwise, sunny, with a high near 72.
Tuesday Night
Patchy fog. Otherwise, mostly clear, with a low around 45.
Wednesday
Areas of fog. Otherwise, sunny, with a high near 77.
Wednesday Night
Mostly clear, with a low around 49.
Thursday
Sunny, with a high near 79.
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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:
1:41 pm PDT Oct 8, 2026
Forecast Valid:
9pm PDT Oct 8, 2026-6pm PDT Oct 15, 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