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.

haze

73°F

23°C

Humidity 46%
Wind Speed SE 13 MPH
Barometer 29.95 in (1014.22 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 18 Oct 03:35 PM PDT
Extended Forecast for

Saint Helena CA

  • Tonight

    Tonight: Areas of fog after 9pm. Otherwise, increasing clouds, with a low around 42. Calm wind.

    Low: 42 °F

    Areas Fog

  • Monday

    Monday: Patchy fog before 8am. Otherwise, increasing clouds, with a high near 68. Calm wind becoming west northwest around 5 mph in the afternoon.

    High: 68 °F

    Patchy Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Areas of fog after 10pm. Otherwise, cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Areas Fog

  • Tuesday

    Tuesday: A 20 percent chance of rain before 11am. Areas of fog before 10am. Otherwise, mostly cloudy, with a high near 69. Calm wind.

    High: 69 °F

    Slight Chance
    Rain and
    Areas Fog
    then Mostly
    Cloudy

  • Tuesday Night

    Tuesday Night: A 40 percent chance of rain. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 46. Calm wind. New precipitation amounts of less than a tenth of an inch possible.

    Low: 46 °F

    Chance Rain
    and Patchy
    Fog

  • Wednesday

    Wednesday: A 50 percent chance of rain. Areas of fog before 10am. Otherwise, mostly cloudy, with a high near 70. New precipitation amounts of less than a tenth of an inch possible.

    High: 70 °F

    Chance Rain
    and Areas Fog

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain. Areas of fog after 9pm. Otherwise, mostly cloudy, with a low around 45.

    Low: 45 °F

    Chance Rain
    and Areas Fog

  • Thursday

    Thursday: A chance of rain after 11am. Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 70.

    High: 70 °F

    Chance Rain
    and Areas Fog

  • Thursday Night

    Thursday Night: Patchy fog after 8pm. Otherwise, partly cloudy, with a low around 43.

    Low: 43 °F

    Patchy Fog

Detailed Forecast

Tonight
Areas of fog after 9pm. Otherwise, increasing clouds, with a low around 42. Calm wind.
Monday
Patchy fog before 8am. Otherwise, increasing clouds, with a high near 68. Calm wind becoming west northwest around 5 mph in the afternoon.
Monday Night
Areas of fog after 10pm. Otherwise, cloudy, with a low around 42. Calm wind.
Tuesday
A 20 percent chance of rain before 11am. Areas of fog before 10am. Otherwise, mostly cloudy, with a high near 69. Calm wind.
Tuesday Night
A 40 percent chance of rain. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 46. Calm wind. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
A 50 percent chance of rain. Areas of fog before 10am. Otherwise, mostly cloudy, with a high near 70. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
A 40 percent chance of rain. Areas of fog after 9pm. Otherwise, mostly cloudy, with a low around 45.
Thursday
A chance of rain after 11am. Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 70.
Thursday Night
Patchy fog after 8pm. Otherwise, partly cloudy, with a low around 43.
Friday
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 72.
Friday Night
Patchy fog. Otherwise, mostly clear, with a low around 42.
Saturday
Areas of fog. Otherwise, mostly sunny, with a high near 72.
Saturday Night
A slight chance of rain. Patchy fog. Otherwise, partly cloudy, with a low around 43.
Sunday
A chance of rain. Patchy fog. Otherwise, mostly sunny, with a high near 70.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Helena CA
 38.49°N 122.45°W (Elev. 230 ft)
Last Update:
1:47 pm PDT Oct 18, 2026
Forecast Valid:
3pm PDT Oct 18, 2026-6pm PDT Oct 25, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation