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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

Santa Rosa, Santa Rosa Sonoma County Airport (KSTS)

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

Clear

66°F

19°C

Humidity 63%
Wind Speed SE 6 MPH
Barometer 29.92 in (1013.21 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 27 Aug 08:00 PM PDT
Extended Forecast for

Saint Helena CA

  • Tonight

    Tonight: Mostly cloudy, with a low around 60. Calm wind.

    Low: 60 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of rain before 11am. Mostly cloudy, then gradually becoming sunny, with a high near 85. Light and variable wind.

    High: 85 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Friday Night

    Friday Night: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 53. Calm wind.

    Low: 53 °F

    Mostly Clear
    then Patchy
    Fog

  • Saturday

    Saturday: Areas of fog before 9am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 85. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 85 °F

    Areas Fog
    then Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 2am. Otherwise, mostly clear, with a low around 52. Southwest wind around 6 mph becoming calm in the evening.

    Low: 52 °F

    Clear then
    Patchy Fog

  • Sunday

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

    High: 86 °F

    Areas Fog
    then Sunny

  • Sunday Night

    Sunday Night: Patchy fog after midnight. Otherwise, mostly clear, with a low around 52.

    Low: 52 °F

    Clear then
    Patchy Fog

  • Monday

    Monday: Areas of fog before 10am. Otherwise, mostly sunny, with a high near 79.

    High: 79 °F

    Areas Fog
    then Sunny

  • Monday Night

    Monday Night: Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 50.

    Low: 50 °F

    Patchy Fog

Detailed Forecast

Tonight
Mostly cloudy, with a low around 60. Calm wind.
Friday
A 20 percent chance of rain before 11am. Mostly cloudy, then gradually becoming sunny, with a high near 85. Light and variable wind.
Friday Night
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 53. Calm wind.
Saturday
Areas of fog before 9am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 85. Calm wind becoming southwest around 5 mph in the afternoon.
Saturday Night
Patchy fog after 2am. Otherwise, mostly clear, with a low around 52. Southwest wind around 6 mph becoming calm in the evening.
Sunday
Areas of fog before 9am. Otherwise, sunny, with a high near 86.
Sunday Night
Patchy fog after midnight. Otherwise, mostly clear, with a low around 52.
Monday
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 79.
Monday Night
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 50.
Tuesday
Areas of fog before 11am. Otherwise, mostly sunny, with a high near 77.
Tuesday Night
Areas of fog. Otherwise, partly cloudy, with a low around 50.
Wednesday
Areas of fog. Otherwise, mostly sunny, with a high near 80.
Wednesday Night
Patchy fog. Otherwise, partly cloudy, with a low around 52.
Thursday
Mostly sunny, with a high near 83.
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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:
8:09 pm PDT Aug 27, 2026
Forecast Valid:
8pm PDT Aug 27, 2026-6pm PDT Sep 3, 2026
 
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Additional Resources

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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