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.

Clear

43°F

6°C

Humidity 75%
Wind Speed N 0 MPH
Barometer 30.08 in (1018.63 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 17 Oct 07:35 AM PDT
Extended Forecast for

Saint Helena CA

  • Today

    Today: Sunny, with a high near 90. Calm wind.

    High: 90 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 51. Calm wind.

    Low: 51 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 78. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 78 °F

    Sunny

  • Sunday Night

    Sunday Night: Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 46. Southwest wind around 5 mph becoming calm in the evening.

    Low: 46 °F

    Patchy Fog

  • Monday

    Monday: Patchy fog before 8am. Otherwise, partly sunny, with a high near 67. Calm wind becoming west around 5 mph in the afternoon.

    High: 67 °F

    Patchy Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: A 20 percent chance of showers. Areas of fog before 10am. Otherwise, partly sunny, with a high near 68.

    High: 68 °F

    Slight Chance
    Showers and
    Areas Fog

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 47.

    Low: 47 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 90. Calm wind.
Tonight
Mostly clear, with a low around 51. Calm wind.
Sunday
Sunny, with a high near 78. Calm wind becoming southwest around 5 mph in the afternoon.
Sunday Night
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 46. Southwest wind around 5 mph becoming calm in the evening.
Monday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 67. Calm wind becoming west around 5 mph in the afternoon.
Monday Night
Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 45.
Tuesday
A 20 percent chance of showers. Areas of fog before 10am. Otherwise, partly sunny, with a high near 68.
Tuesday Night
Mostly cloudy, with a low around 47.
Wednesday
Mostly sunny, with a high near 72.
Wednesday Night
A slight chance of rain after 11pm. Patchy fog after 3am. Otherwise, partly cloudy, with a low around 47.
Thursday
Areas of fog. Otherwise, partly sunny, with a high near 69.
Thursday Night
Patchy fog. Otherwise, mostly clear, with a low around 45.
Friday
Areas of fog. Otherwise, sunny, with a high near 72.
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Helena CA
 38.51°N 122.49°W (Elev. 594 ft)
Last Update:
2:36 am PDT Oct 17, 2026
Forecast Valid:
7am PDT Oct 17, 2026-6pm PDT Oct 23, 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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation