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.

Fog

36°F

2°C

Humidity 100%
Wind Speed N 0 MPH
Barometer 30.28 in (1025.4 mb)
Dewpoint 36°F (2°C)
Visibility 0.50 mi
Last update 28 Dec 01:35 AM PST
Extended Forecast for

2 Miles NW Vallejo CA

  • Overnight

    Overnight: Patchy fog between 2am and 3am.  Otherwise, mostly cloudy, with a low around 39. Light and variable wind.

    Low: 39 °F

    Patchy Fog

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 53. East northeast wind 3 to 6 mph.

    High: 53 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37. East northeast wind around 6 mph.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Patchy frost before 8am.  Otherwise, sunny, with a high near 52. Northeast wind around 8 mph.

    High: 52 °F

    Patchy Frost
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 37. East northeast wind 3 to 5 mph.

    Low: 37 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 51.

    High: 51 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A chance of rain.  Cloudy, with a low around 42.

    Low: 42 °F

    Chance Rain

Detailed Forecast

Overnight
Patchy fog between 2am and 3am. Otherwise, mostly cloudy, with a low around 39. Light and variable wind.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 53. East northeast wind 3 to 6 mph.
Sunday Night
Mostly clear, with a low around 37. East northeast wind around 6 mph.
Monday
Patchy frost before 8am. Otherwise, sunny, with a high near 52. Northeast wind around 8 mph.
Monday Night
Mostly clear, with a low around 37. East northeast wind 3 to 5 mph.
Tuesday
Sunny, with a high near 52.
Tuesday Night
Partly cloudy, with a low around 38.
Wednesday
Mostly cloudy, with a high near 51.
Wednesday Night
A chance of rain. Cloudy, with a low around 42.
New Year's Day
Rain likely, mainly after 10am. Cloudy, with a high near 51.
Thursday Night
Rain likely. Cloudy, with a low around 45.
Friday
A chance of rain. Mostly cloudy, with a high near 51.
Friday Night
A chance of rain. Mostly cloudy, with a low around 44.
Saturday
A chance of rain. Mostly cloudy, with a high near 52.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NW Vallejo CA
 38.16°N 122.25°W (Elev. 26 ft)
12:27 am PST Dec 28, 2025
1am PST Dec 28, 2025-6pm PST Jan 3, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

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