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

Showers and Thunderstorms in the Southwest and Ohio Valley; Mountain Snow in the Northeast

Showers and thunderstorms, along with high-elevation snow, will begin to develop over parts of the Southwest late tonight and is expected to continue through Wednesday morning. Mountain snow over parts the Northeast will continue through Tuesday. A few strong to severe storms and heavy rainfall are possible across portions of the Lower Ohio Valley Tuesday. Read More >

Current conditions at

Santa Rosa, Santa Rosa Sonoma County Airport (KSTS)

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

Overcast

52°F

11°C

Humidity 87%
Wind Speed N 4 MPH
Barometer 29.82 in (1009.82 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 17 Nov 06:15 PM PST
Extended Forecast for

Saint Helena CA

  • Tonight

    Tonight: A 40 percent chance of showers before 10pm. Patchy fog after 7pm. Otherwise, mostly cloudy, then gradually becoming mostly clear, with a low around 43. Light and variable wind becoming east northeast 6 to 11 mph in the evening. New precipitation amounts of less than a tenth of an inch possible.

    Low: 43 °F

    Chance
    Showers and
    Patchy Fog
    then Patchy
    Fog

  • Tuesday

    Tuesday: Areas of fog before 11am. Otherwise, sunny, with a high near 62. West northwest wind 5 to 9 mph.

    High: 62 °F

    Areas Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog. Otherwise, partly cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Patchy Fog

  • Wednesday

    Wednesday: A 30 percent chance of rain after 4pm. Areas of fog before noon. Otherwise, mostly cloudy, with a high near 58. Calm wind.

    High: 58 °F

    Areas Fog
    then Chance
    Rain

  • Wednesday Night

    Wednesday Night: Rain likely, mainly after 10pm. Areas of fog. Otherwise, cloudy, with a low around 46. Calm wind. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 46 °F

    Rain Likely
    and Areas Fog

  • Thursday

    Thursday: Rain likely, mainly before 10am. Patchy fog before 7am. Otherwise, mostly cloudy, with a high near 57. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 57 °F

    Rain Likely
    and Patchy
    Fog

  • Thursday Night

    Thursday Night: A 20 percent chance of rain before 10pm. Patchy fog before 10pm, then patchy fog after 1am. Otherwise, partly cloudy, with a low around 42.

    Low: 42 °F

    Slight Chance
    Rain and
    Patchy Fog
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 7am. Otherwise, sunny, with a high near 63.

    High: 63 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

Detailed Forecast

Tonight
A 40 percent chance of showers before 10pm. Patchy fog after 7pm. Otherwise, mostly cloudy, then gradually becoming mostly clear, with a low around 43. Light and variable wind becoming east northeast 6 to 11 mph in the evening. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
Areas of fog before 11am. Otherwise, sunny, with a high near 62. West northwest wind 5 to 9 mph.
Tuesday Night
Patchy fog. Otherwise, partly cloudy, with a low around 44. Calm wind.
Wednesday
A 30 percent chance of rain after 4pm. Areas of fog before noon. Otherwise, mostly cloudy, with a high near 58. Calm wind.
Wednesday Night
Rain likely, mainly after 10pm. Areas of fog. Otherwise, cloudy, with a low around 46. Calm wind. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday
Rain likely, mainly before 10am. Patchy fog before 7am. Otherwise, mostly cloudy, with a high near 57. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
A 20 percent chance of rain before 10pm. Patchy fog before 10pm, then patchy fog after 1am. Otherwise, partly cloudy, with a low around 42.
Friday
Patchy fog before 7am. Otherwise, sunny, with a high near 63.
Friday Night
Mostly clear, with a low around 43.
Saturday
Patchy fog before 8am. Otherwise, sunny, with a high near 66.
Saturday Night
Patchy fog. Otherwise, mostly clear, with a low around 43.
Sunday
Patchy fog. Otherwise, mostly sunny, with a high near 65.
Sunday Night
Patchy fog. Otherwise, partly cloudy, with a low around 43.
Monday
Patchy fog. Otherwise, mostly sunny, with a high near 63.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Helena CA
 38.51°N 122.46°W (Elev. 203 ft)
Last Update:
12:26 pm PST Nov 17, 2025
Forecast Valid:
6pm PST Nov 17, 2025-6pm PST Nov 24, 2025
 
Forecast Discussion
 
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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