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

34°F

1°C

Humidity 59%
Wind Speed E 10 mph
Barometer 30.34 in (1027.6 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 7 Feb 4:54 pm CST
Extended Forecast for

4 Miles SSW Hardin IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 28. Southeast wind 6 to 10 mph, with gusts as high as 21 mph.

    Low: 28 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 45. Southeast wind 7 to 10 mph, with gusts as high as 21 mph.

    High: 45 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 28. East wind 5 to 7 mph becoming calm after midnight.

    Low: 28 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 57. Calm wind becoming south around 6 mph in the afternoon.

    High: 57 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 41. South wind 6 to 8 mph becoming west after midnight.

    Low: 41 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of rain after noon. Mostly sunny, with a high near 60.

    High: 60 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Tuesday Night

    Tuesday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 35.

    Low: 35 °F

    Chance Rain

  • Wednesday

    Wednesday: A 20 percent chance of rain before noon. Mostly cloudy, with a high near 48.

    High: 48 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 35.

    Low: 35 °F

    Chance Rain

Detailed Forecast

Tonight
Mostly cloudy, with a low around 28. Southeast wind 6 to 10 mph, with gusts as high as 21 mph.
Sunday
Mostly sunny, with a high near 45. Southeast wind 7 to 10 mph, with gusts as high as 21 mph.
Sunday Night
Partly cloudy, with a low around 28. East wind 5 to 7 mph becoming calm after midnight.
Monday
Sunny, with a high near 57. Calm wind becoming south around 6 mph in the afternoon.
Monday Night
Mostly clear, with a low around 41. South wind 6 to 8 mph becoming west after midnight.
Tuesday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 60.
Tuesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 35.
Wednesday
A 20 percent chance of rain before noon. Mostly cloudy, with a high near 48.
Wednesday Night
A 30 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 35.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 43.
Thursday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 29.
Friday
A 20 percent chance of rain. Partly sunny, with a high near 45.
Friday Night
A chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 30%.
Saturday
A chance of rain and snow. Mostly sunny, with a high near 41. Chance of precipitation is 40%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW Hardin IL
 39.1°N 90.64°W (Elev. 758 ft)
Last Update:
4:52 pm CST Feb 7, 2026
Forecast Valid:
5pm CST Feb 7, 2026-6pm CST Feb 14, 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