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

Tropical Depression Nine Forms; Heavy Rainfall in the Southwest and Southeast this Weekend

Tropical Depression Nine has formed and will continue to slowly move to the north-northwest in the coming days. As the storm passes close to the east coast of Florida, tropical storm conditions are possible Sunday through Monday. Tropical Storm Watches have been issued. Significant uncertainty remains in the track and intensity, but chances for impacts to the Southeast are increasing. Read More >

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 53%
Wind Speed SW 10 MPH
Barometer 29.81 in (1009.48 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 27 Sep 03:20 PM PDT
Extended Forecast for

Saint Helena CA

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, increasing clouds, with a low around 52. West southwest wind 5 to 8 mph becoming calm after midnight.

    Low: 52 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 8am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 71. Calm wind becoming southwest 5 to 8 mph in the morning.

    High: 71 °F

    Patchy Fog
    then Partly
    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 53. West northwest wind 3 to 5 mph.

    Low: 53 °F

    Increasing
    Clouds

  • Monday

    Monday: A 50 percent chance of rain. Cloudy, with a high near 71. Calm wind becoming south 5 to 7 mph in the afternoon. New precipitation amounts of less than a tenth of an inch possible.

    High: 71 °F

    Chance Rain

  • Monday Night

    Monday Night: A 50 percent chance of rain. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 53. Northwest wind 3 to 7 mph. New precipitation amounts of less than a tenth of an inch possible.

    Low: 53 °F

    Chance Rain
    and Patchy
    Fog

  • Tuesday

    Tuesday: A 30 percent chance of rain, mainly after 11am. Patchy fog before 8am. Otherwise, partly sunny, with a high near 71. New precipitation amounts of less than a tenth of an inch possible.

    High: 71 °F

    Chance Rain
    and Patchy
    Fog

  • Tuesday Night

    Tuesday Night: A 50 percent chance of rain. Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 54.

    Low: 54 °F

    Chance Rain
    and Patchy
    Fog

  • Wednesday

    Wednesday: A chance of rain. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 69.

    High: 69 °F

    Chance Rain
    and Patchy
    Fog

  • Wednesday Night

    Wednesday Night: A chance of rain, mainly before 11pm. Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 54.

    Low: 54 °F

    Chance Rain
    and Patchy
    Fog

Detailed Forecast

Tonight
Patchy fog after 4am. Otherwise, increasing clouds, with a low around 52. West southwest wind 5 to 8 mph becoming calm after midnight.
Sunday
Patchy fog before 8am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 71. Calm wind becoming southwest 5 to 8 mph in the morning.
Sunday Night
Increasing clouds, with a low around 53. West northwest wind 3 to 5 mph.
Monday
A 50 percent chance of rain. Cloudy, with a high near 71. Calm wind becoming south 5 to 7 mph in the afternoon. New precipitation amounts of less than a tenth of an inch possible.
Monday Night
A 50 percent chance of rain. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 53. Northwest wind 3 to 7 mph. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
A 30 percent chance of rain, mainly after 11am. Patchy fog before 8am. Otherwise, partly sunny, with a high near 71. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
A 50 percent chance of rain. Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 54.
Wednesday
A chance of rain. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 69.
Wednesday Night
A chance of rain, mainly before 11pm. Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 54.
Thursday
A slight chance of rain before 11am. Areas of fog before 11am. Otherwise, partly sunny, with a high near 74.
Thursday Night
Patchy fog. Otherwise, partly cloudy, with a low around 50.
Friday
Patchy fog. Otherwise, sunny, with a high near 79.
Friday Night
Mostly clear, with a low around 51.
Saturday
Sunny, with a high near 82.
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:
1:25 pm PDT Sep 27, 2025
Forecast Valid:
3pm PDT Sep 27, 2025-6pm PDT Oct 4, 2025
 
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