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

Santa Rosa, Santa Rosa Sonoma County Airport (KSTS)

Lat: 38.5°NLon: 122.81667°WElev: 125.0ft.

Clear

54°F

12°C

Humidity 81%
Wind Speed N 0 MPH
Barometer 30.1 in (1019.3 mb)
Dewpoint 48°F (9°C)
Visibility 8.00 mi
Last update 18 Jan 06:30 PM PST
Extended Forecast for

Guerneville CA

  • Tonight

    Tonight: Partly cloudy, with a low around 43. Calm wind.

    Low: 43 °F

    Partly Cloudy

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 64. Calm wind.

    High: 64 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Patchy dense fog.  Otherwise, partly cloudy, with a low around 43. Calm wind.

    Low: 43 °F

    Patchy Dense
    Fog

  • Tuesday

    Tuesday: Patchy dense fog before 7am.  Otherwise, mostly sunny, with a high near 63. Calm wind.

    High: 63 °F

    Patchy Dense
    Fog then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog before midnight.  Otherwise, mostly cloudy, with a low around 45. Calm wind.

    Low: 45 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 62.

    High: 62 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Patchy fog.  Otherwise, mostly cloudy, with a low around 45.

    Low: 45 °F

    Patchy Fog

  • Thursday

    Thursday: Areas of fog before 10am.  Otherwise, sunny, with a high near 61.

    High: 61 °F

    Areas Fog
    then Sunny

  • Thursday Night

    Thursday Night: Areas of fog.  Otherwise, mostly clear, with a low around 43.

    Low: 43 °F

    Areas Fog

Detailed Forecast

Tonight
Partly cloudy, with a low around 43. Calm wind.
M.L.King Day
Mostly sunny, with a high near 64. Calm wind.
Monday Night
Patchy dense fog. Otherwise, partly cloudy, with a low around 43. Calm wind.
Tuesday
Patchy dense fog before 7am. Otherwise, mostly sunny, with a high near 63. Calm wind.
Tuesday Night
Patchy fog before midnight. Otherwise, mostly cloudy, with a low around 45. Calm wind.
Wednesday
Mostly cloudy, with a high near 62.
Wednesday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 45.
Thursday
Areas of fog before 10am. Otherwise, sunny, with a high near 61.
Thursday Night
Areas of fog. Otherwise, mostly clear, with a low around 43.
Friday
Areas of fog before 11am. Otherwise, sunny, with a high near 61.
Friday Night
Patchy fog. Otherwise, mostly clear, with a low around 43.
Saturday
Areas of fog. Otherwise, mostly sunny, with a high near 59.
Saturday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 43.
Sunday
Areas of fog. Otherwise, mostly sunny, with a high near 59.
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ABOUT THIS FORECAST

 
Point Forecast:
Guerneville CA
 38.5°N 122.98°W (Elev. 397 ft)
12:26 pm PST Jan 18, 2026
6pm PST Jan 18, 2026-6pm PST Jan 25, 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