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.

Overcast

20°F

-7°C

Humidity 45%
Wind Speed S 6 mph
Barometer 30.42 in (1030.8 mb)
Dewpoint 2°F (-17°C)
Visibility 10.00 mi
Wind Chill12°F (-11°C)
Last update 20 Jan 8:54 am CST
Extended Forecast for

4 Miles SSW Hardin IL

  • Today

    Today: Mostly sunny, with a high near 36. South wind 7 to 10 mph.

    High: 36 °F

    Mostly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 27. South wind 8 to 13 mph, with gusts as high as 23 mph.

    Low: 27 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 40. West wind 8 to 10 mph, with gusts as high as 22 mph.

    High: 40 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 22. Southwest wind 7 to 10 mph becoming northwest after midnight.

    Low: 22 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 34. Northwest wind 3 to 6 mph.

    High: 34 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 9.

    Low: 9 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 14.

    High: 14 °F

    Cold

  • Friday Night

    Friday Night: A 30 percent chance of snow, mainly after midnight. Mostly cloudy, with a low around 1.

    Low: 1 °F

    Chance Snow

  • Saturday

    Saturday: A 30 percent chance of snow. Mostly cloudy and cold, with a high near 12.

    High: 12 °F

    Chance Snow

Detailed Forecast

Today
Mostly sunny, with a high near 36. South wind 7 to 10 mph.
Tonight
Increasing clouds, with a low around 27. South wind 8 to 13 mph, with gusts as high as 23 mph.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 40. West wind 8 to 10 mph, with gusts as high as 22 mph.
Wednesday Night
Partly cloudy, with a low around 22. Southwest wind 7 to 10 mph becoming northwest after midnight.
Thursday
Mostly sunny, with a high near 34. Northwest wind 3 to 6 mph.
Thursday Night
Mostly cloudy, with a low around 9.
Friday
Mostly cloudy and cold, with a high near 14.
Friday Night
A 30 percent chance of snow, mainly after midnight. Mostly cloudy, with a low around 1.
Saturday
A 30 percent chance of snow. Mostly cloudy and cold, with a high near 12.
Saturday Night
A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 6.
Sunday
Mostly sunny, with a high near 22.
Sunday Night
Mostly clear, with a low around 7.
Monday
Sunny, with a high near 27.
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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:
8:47 am CST Jan 20, 2026
Forecast Valid:
9am CST Jan 20, 2026-6pm CST Jan 26, 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