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

Fire Weather Concerns; Record Warmth Spreads

The Plains to the mid-Mississippi Valley continue with warm and dry conditions. Any fires that initiate could spread quickly. The warm temperatures will expand across the Southern Plains into the Southwest where numerous records are expected through the weekend. Meanwhile, a cold front will move southward across the northern Plains and Great Lakes region where some snow will develop this weekend. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

57°F

14°C

Humidity 96%
Wind Speed N 5 MPH
Barometer 29.96 in (1014.56 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 28 Feb 01:54 AM PST
Extended Forecast for

4 Miles E Saint Helena CA

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 59. Calm wind.

    Low: 59 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 76. Light and variable wind.

    High: 76 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 51. Calm wind.

    Low: 51 °F

    Patchy Fog

  • Sunday

    Sunday: Areas of dense fog before 9am. Otherwise, mostly cloudy, with a high near 65. Calm wind becoming west southwest around 6 mph in the afternoon.

    High: 65 °F

    Areas Dense
    Fog then
    Partly Sunny

  • Sunday Night

    Sunday Night: A 30 percent chance of rain. Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 48. Light west southwest wind.

    Low: 48 °F

    Chance Rain
    and Patchy
    Fog

  • Monday

    Monday: Partly sunny, with a high near 66.

    High: 66 °F

    Partly Sunny

  • Monday Night

    Monday Night: Patchy fog after 10pm. Otherwise, mostly clear, with a low around 45.

    Low: 45 °F

    Patchy Fog

  • Tuesday

    Tuesday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 67.

    High: 67 °F

    Patchy Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 45.

    Low: 45 °F

    Patchy Fog

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 59. Calm wind.
Saturday
Partly sunny, with a high near 76. Light and variable wind.
Saturday Night
Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 51. Calm wind.
Sunday
Areas of dense fog before 9am. Otherwise, mostly cloudy, with a high near 65. Calm wind becoming west southwest around 6 mph in the afternoon.
Sunday Night
A 30 percent chance of rain. Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 48. Light west southwest wind.
Monday
Partly sunny, with a high near 66.
Monday Night
Patchy fog after 10pm. Otherwise, mostly clear, with a low around 45.
Tuesday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 67.
Tuesday Night
Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 45.
Wednesday
Mostly sunny, with a high near 67.
Wednesday Night
Mostly clear, with a low around 45.
Thursday
Sunny, with a high near 68.
Thursday Night
Mostly clear, with a low around 48.
Friday
Sunny, with a high near 70.
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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:
1:21 am PST Feb 28, 2026
Forecast Valid:
2am PST Feb 28, 2026-6pm PST Mar 6, 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