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

71°F

22°C

Humidity 57%
Wind Speed S 5 mph
Barometer 30.02 in (1016.3 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 11 Oct 10:54 am CDT
Extended Forecast for

Hardin IL

  • Today

    Today: Sunny, with a high near 87. Light south wind.

    High: 87 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 65. South wind 3 to 6 mph.

    Low: 65 °F

    Partly Cloudy

  • Columbus Day

    Columbus Day: Sunny, with a high near 92. Southwest wind 7 to 13 mph, with gusts as high as 22 mph.

    High: 92 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 71. Southwest wind 7 to 9 mph.

    Low: 71 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 92. West wind 7 to 9 mph.

    High: 92 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 68. Chance of precipitation is 60%.

    Low: 68 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm before 1pm, then showers likely. High near 80. Chance of precipitation is 80%.

    High: 80 °F

    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 61. Chance of precipitation is 60%.

    Low: 61 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 75. Chance of precipitation is 80%.

    High: 75 °F

    Showers

Detailed Forecast

Today
Sunny, with a high near 87. Light south wind.
Tonight
Partly cloudy, with a low around 65. South wind 3 to 6 mph.
Columbus Day
Sunny, with a high near 92. Southwest wind 7 to 13 mph, with gusts as high as 22 mph.
Monday Night
Clear, with a low around 71. Southwest wind 7 to 9 mph.
Tuesday
Sunny, with a high near 92. West wind 7 to 9 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 68. Chance of precipitation is 60%.
Wednesday
Showers and possibly a thunderstorm before 1pm, then showers likely. High near 80. Chance of precipitation is 80%.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 61. Chance of precipitation is 60%.
Thursday
Showers and possibly a thunderstorm. High near 75. Chance of precipitation is 80%.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 53.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 66.
Friday Night
Partly cloudy, with a low around 41.
Saturday
Sunny, with a high near 60.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hardin IL
 39.16°N 90.64°W (Elev. 692 ft)
Last Update:
10:36 am CDT Oct 11, 2026
Forecast Valid:
11am CDT Oct 11, 2026-6pm CDT Oct 17, 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