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

Dangerous Heat and Possible Flooding This Week

Hot temperatures and high humidity are forecast to continue across much of east Texas into the mid-Mississippi Valley through this week. Heavy to excessive rainfall occurring at times through Friday could bring areas of flooding across parts of the central Plains into the upper Midwest and Four Corners states. Read More >

Current conditions at

Santa Rosa, Santa Rosa Sonoma County Airport (KSTS)

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

Clear

52°F

11°C

Humidity 93%
Wind Speed N 0 MPH
Barometer 29.85 in (1010.84 mb)
Dewpoint 50°F (10°C)
Visibility 9.00 mi
Last update 15 Sep 12:35 AM PDT
Extended Forecast for

Saint Helena CA

  • Overnight

    Overnight: Mostly clear, with a low around 55. Calm wind.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 87. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 87 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 4am. Otherwise, mostly clear, with a low around 52. Calm wind.

    Low: 52 °F

    Clear then
    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog between 7am and 9am. Otherwise, mostly sunny, with a high near 79. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 79 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 52. Southwest wind around 5 mph becoming calm in the evening.

    Low: 52 °F

    Partly Cloudy

  • Thursday

    Thursday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 83.

    High: 83 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 54.

    Low: 54 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Friday Night

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

    Low: 54 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 55. Calm wind.
Tuesday
Sunny, with a high near 87. Calm wind becoming southwest around 5 mph in the afternoon.
Tuesday Night
Patchy fog after 4am. Otherwise, mostly clear, with a low around 52. Calm wind.
Wednesday
Patchy fog between 7am and 9am. Otherwise, mostly sunny, with a high near 79. Calm wind becoming southwest around 5 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 52. Southwest wind around 5 mph becoming calm in the evening.
Thursday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 83.
Thursday Night
Mostly clear, with a low around 54.
Friday
Sunny, with a high near 87.
Friday Night
Mostly clear, with a low around 54.
Saturday
Sunny, with a high near 86.
Saturday Night
Partly cloudy, with a low around 54.
Sunday
Mostly sunny, with a high near 84.
Sunday Night
Partly cloudy, with a low around 53.
Monday
Mostly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Helena CA
 38.49°N 122.48°W (Elev. 318 ft)
Last Update:
11:32 pm PDT Sep 14, 2026
Forecast Valid:
12am PDT Sep 15, 2026-6pm PDT Sep 21, 2026
 
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Additional Resources

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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