Tracking Late December Winter Storm Expected to Impact the Northern Plains through the Northeast U.S.

A winter storm system will rapidly intensify over the Midwest on Sunday and track through the Great Lakes on Monday. Periods of heavy snow are anticipated across the Upper Great Lakes late Sunday and continuing into Monday. At least 1/10 inch of ice accumulation is expected from a wintry mix across much of the interior Northeast U.S. starting Sunday afternoon. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Partly Cloudy

54°F

12°C

Humidity 76%
Wind Speed SW 5 MPH
Barometer 30.18 in (1022.01 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 27 Dec 12:00 PM PST
Extended Forecast for

4 Miles SE Saint Helena CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 54. Light north wind.

    High: 54 °F

    Sunny

  • Tonight

    Tonight: Patchy frost after 3am.  Otherwise, partly cloudy, with a low around 36. Calm wind.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Sunday

    Sunday: Patchy frost before 7am.  Otherwise, sunny, with a high near 55. Calm wind.

    High: 55 °F

    Patchy Frost
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 38. Calm wind.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 57. Light northeast wind.

    High: 57 °F

    Sunny

  • Monday Night

    Monday Night: Patchy frost after 3am.  Otherwise, mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Tuesday

    Tuesday: Areas of frost before 7am.  Otherwise, sunny, with a high near 57.

    High: 57 °F

    Areas Frost
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog.  Otherwise, mostly clear, with a low around 37.

    Low: 37 °F

    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog before 10am.  Otherwise, partly sunny, with a high near 57.

    High: 57 °F

    Patchy Fog
    then Partly
    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 54. Light north wind.
Tonight
Patchy frost after 3am. Otherwise, partly cloudy, with a low around 36. Calm wind.
Sunday
Patchy frost before 7am. Otherwise, sunny, with a high near 55. Calm wind.
Sunday Night
Mostly clear, with a low around 38. Calm wind.
Monday
Sunny, with a high near 57. Light northeast wind.
Monday Night
Patchy frost after 3am. Otherwise, mostly clear, with a low around 36.
Tuesday
Areas of frost before 7am. Otherwise, sunny, with a high near 57.
Tuesday Night
Patchy fog. Otherwise, mostly clear, with a low around 37.
Wednesday
Patchy fog before 10am. Otherwise, partly sunny, with a high near 57.
Wednesday Night
A chance of rain. Areas of fog. Otherwise, mostly cloudy, with a low around 41.
New Year's Day
Rain likely. Widespread fog. Otherwise, mostly cloudy, with a high near 54.
Thursday Night
Rain likely. Areas of fog. Otherwise, cloudy, with a low around 43.
Friday
A chance of rain. Areas of fog. Otherwise, mostly cloudy, with a high near 54.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SE Saint Helena CA
 38.45°N 122.41°W (Elev. 157 ft)
11:05 am PST Dec 27, 2025
12pm PST Dec 27, 2025-6pm PST Jan 2, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

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