Lake-effect Snow and Whiteout Conditions in the Great Lakes Region; Below-average Temperatures in the East

Heavy lake-effect and lake-enhanced snow will persist downwind of the Great Lakes and produce some whiteout conditions that could cause difficult travel conditions. A coastal low will produce moderate to heavy snow over parts of southern and eastern New England into the afternoon. Below average temperatures are expected across the eastern U.S., particularly with chilly morning temperatures. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Mist

43°F

6°C

Humidity 96%
Wind Speed E 10 MPH
Barometer 30.12 in (1019.98 mb)
Dewpoint 42°F (6°C)
Visibility 5.00 mi
Wind Chill37°F (3°C)
Last update 20 Jan 12:54 AM PST
Extended Forecast for

Sonoma CA

  • Overnight

    Overnight: Areas of dense fog.  Otherwise, mostly cloudy, with a low around 38. Calm wind.

    Low: 38 °F

    Areas Dense
    Fog

  • Tuesday

    Tuesday: Areas of dense fog before 11am.  Otherwise, mostly cloudy, with a high near 59. Light and variable wind.

    High: 59 °F

    Areas Dense
    Fog then
    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Patchy fog between 9pm and 2am.  Otherwise, mostly cloudy, with a low around 43. Calm wind.

    Low: 43 °F

    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog before 9am.  Otherwise, cloudy, with a high near 59. Calm wind.

    High: 59 °F

    Patchy Fog
    then Cloudy

  • Wednesday Night

    Wednesday Night: Patchy fog after 10pm.  Otherwise, cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 10am.  Otherwise, partly sunny, with a high near 61.

    High: 61 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Patchy fog.  Otherwise, mostly cloudy, with a low around 42.

    Low: 42 °F

    Patchy Fog

  • Friday

    Friday: Areas of fog before 11am.  Otherwise, mostly sunny, with a high near 61.

    High: 61 °F

    Areas Fog
    then Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Overnight
Areas of dense fog. Otherwise, mostly cloudy, with a low around 38. Calm wind.
Tuesday
Areas of dense fog before 11am. Otherwise, mostly cloudy, with a high near 59. Light and variable wind.
Tuesday Night
Patchy fog between 9pm and 2am. Otherwise, mostly cloudy, with a low around 43. Calm wind.
Wednesday
Patchy fog before 9am. Otherwise, cloudy, with a high near 59. Calm wind.
Wednesday Night
Patchy fog after 10pm. Otherwise, cloudy, with a low around 44. Calm wind.
Thursday
Patchy fog before 10am. Otherwise, partly sunny, with a high near 61.
Thursday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 42.
Friday
Areas of fog before 11am. Otherwise, mostly sunny, with a high near 61.
Friday Night
Mostly clear, with a low around 40.
Saturday
Mostly sunny, with a high near 60.
Saturday Night
Partly cloudy, with a low around 40.
Sunday
Partly sunny, with a high near 59.
Sunday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 40.
Monday
Areas of fog. Otherwise, mostly cloudy, with a high near 61.
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ABOUT THIS FORECAST

 
Point Forecast:
Sonoma CA
 38.29°N 122.46°W (Elev. 72 ft)
12:26 am PST Jan 20, 2026
1am PST Jan 20, 2026-6pm PST Jan 26, 2026
 
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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