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

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

16°F

-9°C

Humidity 59%
Wind Speed N 5 mph
Barometer 30.28 in (1026.1 mb)
Dewpoint 4°F (-16°C)
Visibility 10.00 mi
Wind Chill8°F (-13°C)
Last update 4 Dec 7:54 pm CST
Extended Forecast for

3 Miles SSW Dow IL

  • Tonight

    Tonight: Clear, with a low around 6. Northeast wind around 5 mph becoming calm.

    Low: 6 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 36. South wind 5 to 9 mph.

    High: 36 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 25. South wind 5 to 7 mph becoming west after midnight.

    Low: 25 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Partly sunny, with a high near 34. Light and variable wind becoming north around 6 mph in the afternoon.

    High: 34 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 27. East wind around 7 mph.

    Low: 27 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: A chance of rain and snow before noon, then a slight chance of snow. Mostly cloudy, with a high near 33. Chance of precipitation is 30%.

    High: 33 °F

    Chance
    Rain/Snow
    then Slight
    Chance Snow

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 12.

    Low: 12 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 29.

    High: 29 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 22.

    Low: 22 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 6. Northeast wind around 5 mph becoming calm.
Friday
Sunny, with a high near 36. South wind 5 to 9 mph.
Friday Night
Increasing clouds, with a low around 25. South wind 5 to 7 mph becoming west after midnight.
Saturday
Partly sunny, with a high near 34. Light and variable wind becoming north around 6 mph in the afternoon.
Saturday Night
A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 27. East wind around 7 mph.
Sunday
A chance of rain and snow before noon, then a slight chance of snow. Mostly cloudy, with a high near 33. Chance of precipitation is 30%.
Sunday Night
Mostly cloudy, with a low around 12.
Monday
Mostly sunny, with a high near 29.
Monday Night
Partly cloudy, with a low around 22.
Tuesday
Mostly sunny, with a high near 41.
Tuesday Night
Mostly cloudy, with a low around 30.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 43.
Wednesday Night
Mostly cloudy, with a low around 21.
Thursday
Partly sunny, with a high near 33.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39°N 90.33°W (Elev. 597 ft)
Last Update:
7:36 pm CST Dec 4, 2025
Forecast Valid:
8pm CST Dec 4, 2025-6pm CST Dec 11, 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