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

24°F

-4°C

Humidity 71%
Wind Speed Calm
Barometer 30.41 in (1030.3 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Last update 4 Feb 6:54 pm CST
Extended Forecast for

3 Miles SSW Dow IL

  • Tonight

    Tonight: Mostly clear, with a low around 13. North wind around 5 mph becoming calm in the evening.

    Low: 13 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly cloudy, with a high near 39. Southwest wind 5 to 11 mph.

    High: 39 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 28. West wind 6 to 10 mph.

    Low: 28 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 48. Breezy, with a west wind 13 to 20 mph becoming northwest in the afternoon. Winds could gust as high as 29 mph.

    High: 48 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 25. North wind 6 to 13 mph, with gusts as high as 21 mph.

    Low: 25 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 36.

    High: 36 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 13. North wind around 5 mph becoming calm in the evening.
Thursday
Mostly cloudy, with a high near 39. Southwest wind 5 to 11 mph.
Thursday Night
Partly cloudy, with a low around 28. West wind 6 to 10 mph.
Friday
Mostly sunny, with a high near 48. Breezy, with a west wind 13 to 20 mph becoming northwest in the afternoon. Winds could gust as high as 29 mph.
Friday Night
Partly cloudy, with a low around 25. North wind 6 to 13 mph, with gusts as high as 21 mph.
Saturday
Mostly sunny, with a high near 36.
Saturday Night
Mostly cloudy, with a low around 27.
Sunday
Mostly sunny, with a high near 53.
Sunday Night
Mostly clear, with a low around 31.
Monday
Sunny, with a high near 55.
Monday Night
Mostly clear, with a low around 38.
Tuesday
A 20 percent chance of rain. Partly sunny, with a high near 59.
Tuesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 39.
Wednesday
A 20 percent chance of rain. Mostly sunny, with a high near 54.
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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:
2:37 pm CST Feb 4, 2026
Forecast Valid:
7pm CST Feb 4, 2026-6pm CST Feb 11, 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