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

88°F

31°C

Humidity 16%
Wind Speed S 10 MPH
Barometer 30.04 in (1017.27 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 15 Oct 05:15 PM PDT
Extended Forecast for

Saint Helena CA

  • Tonight

    Tonight: Mostly clear, with a low around 55. Calm wind becoming north northwest around 6 mph in the evening.

    Low: 55 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 92. North northwest wind around 6 mph becoming calm in the afternoon.

    High: 92 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 54. Calm wind.

    Low: 54 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 92. Calm wind.

    High: 92 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 48. Light and variable wind.

    Low: 48 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Sunday Night

    Sunday Night: Areas of fog after 10pm. Otherwise, mostly clear, with a low around 43.

    Low: 43 °F

    Areas Fog

  • Monday

    Monday: Partly sunny, with a high near 68.

    High: 68 °F

    Partly Sunny

  • Monday Night

    Monday Night: A slight chance of rain after 11pm. Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 46.

    Low: 46 °F

    Slight Chance
    Rain and
    Patchy Fog

Detailed Forecast

Tonight
Mostly clear, with a low around 55. Calm wind becoming north northwest around 6 mph in the evening.
Friday
Sunny, with a high near 92. North northwest wind around 6 mph becoming calm in the afternoon.
Friday Night
Mostly clear, with a low around 54. Calm wind.
Saturday
Sunny, with a high near 92. Calm wind.
Saturday Night
Mostly clear, with a low around 48. Light and variable wind.
Sunday
Sunny, with a high near 80.
Sunday Night
Areas of fog after 10pm. Otherwise, mostly clear, with a low around 43.
Monday
Partly sunny, with a high near 68.
Monday Night
A slight chance of rain after 11pm. Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 46.
Tuesday
A chance of rain, mainly after 11am. Areas of fog before 10am. Otherwise, partly sunny, with a high near 68.
Tuesday Night
A chance of rain. Patchy fog. Otherwise, mostly cloudy, with a low around 46.
Wednesday
A slight chance of rain. Patchy fog. Otherwise, mostly sunny, with a high near 70.
Wednesday Night
Patchy fog. Otherwise, mostly clear, with a low around 46.
Thursday
Patchy fog. Otherwise, mostly sunny, with a high near 69.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Helena CA
 38.51°N 122.46°W (Elev. 203 ft)
Last Update:
1:56 pm PDT Oct 15, 2026
Forecast Valid:
5pm PDT Oct 15, 2026-6pm PDT Oct 22, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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