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.

Partly Cloudy

50°F

10°C

Humidity 100%
Wind Speed Calm
Barometer 30.01 in (1016.2 mb)
Dewpoint 50°F (10°C)
Visibility 8.00 mi
Last update 11 Oct 7:54 am CDT
Extended Forecast for

Hardin ILSimilar City Names

  • Today

    Today: Sunny, with a high near 90. Light and variable wind.

    High: 90 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 65. South wind 3 to 6 mph.

    Low: 65 °F

    Increasing
    Clouds

  • Columbus Day

    Columbus Day: Sunny, with a high near 94. Southwest wind 6 to 13 mph, with gusts as high as 22 mph.

    High: 94 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 71. Southwest wind around 8 mph.

    Low: 71 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 94. West wind 7 to 9 mph.

    High: 94 °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 82. Chance of precipitation is 80%.

    High: 82 °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 77. Chance of precipitation is 80%.

    High: 77 °F

    Showers

Detailed Forecast

Today
Sunny, with a high near 90. Light and variable wind.
Tonight
Increasing clouds, with a low around 65. South wind 3 to 6 mph.
Columbus Day
Sunny, with a high near 94. Southwest wind 6 to 13 mph, with gusts as high as 22 mph.
Monday Night
Clear, with a low around 71. Southwest wind around 8 mph.
Tuesday
Sunny, with a high near 94. 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 82. 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 77. Chance of precipitation is 80%.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 52.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 68.
Friday Night
Partly cloudy, with a low around 41.
Saturday
Sunny, with a high near 62.
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ABOUT THIS FORECAST

 
Point Forecast:
Hardin ILSimilar City Names
 39.14°N 90.61°W (Elev. 427 ft)
Last Update:
5:26 am CDT Oct 11, 2026
Forecast Valid:
8am CDT Oct 11, 2026-6pm CDT Oct 17, 2026
 
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Additional Resources

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National Digital Forecast Database Weather Element Forecast

Chance of Precipitation