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

Santa Rosa, Santa Rosa Sonoma County Airport (KSTS)

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

Mostly Cloudy

50°F

10°C

Humidity 87%
Wind Speed N 0 MPH
Barometer 29.89 in (1012.19 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 20 Oct 01:30 AM PDT
Extended Forecast for

Guerneville CA

  • Overnight

    Overnight: Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 46. Calm wind.

    Low: 46 °F

    Patchy Fog

  • Tuesday

    Tuesday: Patchy fog between 7am and 10am. Otherwise, mostly cloudy, with a high near 67. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 67 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 11pm. Mostly cloudy, with a low around 50. Calm wind.

    Low: 50 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: A 40 percent chance of showers, mainly after 4pm. Partly sunny, with a high near 70. Calm wind becoming west southwest around 5 mph in the afternoon.

    High: 70 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers, mainly after 11pm. Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 50. West wind around 5 mph becoming calm in the evening. New precipitation amounts of less than a tenth of an inch possible.

    Low: 50 °F

    Chance
    Showers and
    Patchy Fog

  • Thursday

    Thursday: A 20 percent chance of showers before 11am. Areas of fog before 11am. Otherwise, partly sunny, with a high near 68. New precipitation amounts of less than a tenth of an inch possible.

    High: 68 °F

    Slight Chance
    Showers and
    Areas Fog
    then Partly
    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

  • Friday

    Friday: Patchy fog before 9am. Otherwise, sunny, with a high near 72.

    High: 72 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 46.

    Low: 46 °F

    Mostly Clear

Detailed Forecast

Overnight
Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 46. Calm wind.
Tuesday
Patchy fog between 7am and 10am. Otherwise, mostly cloudy, with a high near 67. Calm wind becoming south southwest around 5 mph in the afternoon.
Tuesday Night
A 20 percent chance of showers after 11pm. Mostly cloudy, with a low around 50. Calm wind.
Wednesday
A 40 percent chance of showers, mainly after 4pm. Partly sunny, with a high near 70. Calm wind becoming west southwest around 5 mph in the afternoon.
Wednesday Night
A 30 percent chance of showers, mainly after 11pm. Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 50. West wind around 5 mph becoming calm in the evening. New precipitation amounts of less than a tenth of an inch possible.
Thursday
A 20 percent chance of showers before 11am. Areas of fog before 11am. Otherwise, partly sunny, with a high near 68. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
Partly cloudy, with a low around 45.
Friday
Patchy fog before 9am. Otherwise, sunny, with a high near 72.
Friday Night
Mostly clear, with a low around 46.
Saturday
Sunny, with a high near 73.
Saturday Night
Partly cloudy, with a low around 48.
Sunday
Mostly sunny, with a high near 72.
Sunday Night
Partly cloudy, with a low around 47.
Monday
Mostly sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Guerneville CA
 38.5°N 122.98°W (Elev. 397 ft)
Last Update:
1:26 am PDT Oct 20, 2026
Forecast Valid:
1am PDT Oct 20, 2026-6pm PDT Oct 26, 2026
 
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Additional Resources

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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