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.

A Few Clouds

41°F

5°C

Humidity 60%
Wind Speed E 13 mph
Barometer 30.31 in (1026.4 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 24 Mar 2:54 am CDT
Extended Forecast for

4 Miles SSW Hardin IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 37. East wind around 7 mph.

    Low: 37 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 61. Southeast wind 6 to 9 mph.

    High: 61 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 44. Southeast wind around 7 mph.

    Low: 44 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 76. South wind 6 to 13 mph.

    High: 76 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 63. South wind 7 to 10 mph, with gusts as high as 21 mph.

    Low: 63 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm, mainly before 4am, then rain after 4am. Low around 43. Chance of precipitation is 80%.

    Low: 43 °F

    Showers

  • Friday

    Friday: Rain, mainly before 7am. High near 50. Chance of precipitation is 80%.

    High: 50 °F

    Rain then
    Chance Rain

  • Friday Night

    Friday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 37. East wind around 7 mph.
Tuesday
Mostly sunny, with a high near 61. Southeast wind 6 to 9 mph.
Tuesday Night
Mostly cloudy, with a low around 44. Southeast wind around 7 mph.
Wednesday
Mostly sunny, with a high near 76. South wind 6 to 13 mph.
Wednesday Night
Mostly clear, with a low around 63. South wind 7 to 10 mph, with gusts as high as 21 mph.
Thursday
Mostly sunny, with a high near 87.
Thursday Night
Showers and possibly a thunderstorm, mainly before 4am, then rain after 4am. Low around 43. Chance of precipitation is 80%.
Friday
Rain, mainly before 7am. High near 50. Chance of precipitation is 80%.
Friday Night
Mostly clear, with a low around 30.
Saturday
Sunny, with a high near 55.
Saturday Night
Partly cloudy, with a low around 40.
Sunday
Partly sunny, with a high near 63.
Sunday Night
Partly cloudy, with a low around 47.
Monday
A 20 percent chance of rain. Mostly sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW Hardin IL
 39.1°N 90.64°W (Elev. 758 ft)
Last Update:
2:56 am CDT Mar 24, 2026
Forecast Valid:
3am CDT Mar 24, 2026-6pm CDT Mar 30, 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