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

Areas of Dangerous Heat and Severe Thunderstorms

Dangerous heat will persist across the Southwest U.S. through Friday with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week before returning over much of the Plains into next week. Scattered strong to severe thunderstorms are possible across parts of the Northeast U.S. on Thursday. Damaging wind, hail, and a tornado or two are possible. Read More >

Current conditions at

Santa Rosa, Santa Rosa Sonoma County Airport (KSTS)

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

Clear

63°F

17°C

Humidity 77%
Wind Speed SSE 3 MPH
Barometer 29.93 in (1013.55 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 26 Aug 11:00 PM PDT
Extended Forecast for

Saint Helena CA

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 60. Northwest wind around 5 mph becoming calm after midnight.

    Low: 60 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A slight chance of showers and thunderstorms before 11am, then a slight chance of rain after 11am. Mostly sunny, with a high near 94. Calm wind becoming west southwest 5 to 8 mph in the afternoon. Chance of precipitation is 20%.

    High: 94 °F

    Slight Chance
    T-storms then
    Slight Chance
    Rain

  • Thursday Night

    Thursday Night: A 20 percent chance of rain. Increasing clouds, with a low around 60. West southwest wind around 5 mph becoming calm in the evening.

    Low: 60 °F

    Slight Chance
    Rain

  • Friday

    Friday: A 20 percent chance of rain before 11am. Cloudy, with a high near 86. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 86 °F

    Slight Chance
    Rain then
    Cloudy

  • Friday Night

    Friday Night: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 52. West southwest wind 5 to 9 mph becoming calm in the evening.

    Low: 52 °F

    Partly Cloudy
    then Patchy
    Fog

  • Saturday

    Saturday: Areas of fog before 9am. Otherwise, sunny, with a high near 86.

    High: 86 °F

    Areas Fog
    then Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 2am. Otherwise, mostly clear, with a low around 52.

    Low: 52 °F

    Clear then
    Patchy Fog

  • Sunday

    Sunday: Areas of fog before 9am. Otherwise, sunny, with a high near 85.

    High: 85 °F

    Areas Fog
    then Sunny

  • Sunday Night

    Sunday Night: Patchy fog after midnight. Otherwise, mostly clear, with a low around 51.

    Low: 51 °F

    Clear then
    Patchy Fog

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 60. Northwest wind around 5 mph becoming calm after midnight.
Thursday
A slight chance of showers and thunderstorms before 11am, then a slight chance of rain after 11am. Mostly sunny, with a high near 94. Calm wind becoming west southwest 5 to 8 mph in the afternoon. Chance of precipitation is 20%.
Thursday Night
A 20 percent chance of rain. Increasing clouds, with a low around 60. West southwest wind around 5 mph becoming calm in the evening.
Friday
A 20 percent chance of rain before 11am. Cloudy, with a high near 86. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Friday Night
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 52. West southwest wind 5 to 9 mph becoming calm in the evening.
Saturday
Areas of fog before 9am. Otherwise, sunny, with a high near 86.
Saturday Night
Patchy fog after 2am. Otherwise, mostly clear, with a low around 52.
Sunday
Areas of fog before 9am. Otherwise, sunny, with a high near 85.
Sunday Night
Patchy fog after midnight. Otherwise, mostly clear, with a low around 51.
Monday
Areas of fog before 11am. Otherwise, mostly sunny, with a high near 79.
Monday Night
Patchy fog. Otherwise, partly cloudy, with a low around 48.
Tuesday
Areas of fog. Otherwise, mostly sunny, with a high near 79.
Tuesday Night
Patchy fog. Otherwise, partly cloudy, with a low around 50.
Wednesday
Areas of fog. Otherwise, mostly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Helena CA
 38.51°N 122.46°W (Elev. 203 ft)
Last Update:
10:46 pm PDT Aug 26, 2026
Forecast Valid:
11pm PDT Aug 26, 2026-6pm PDT Sep 2, 2026
 
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