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

40°F

4°C

Humidity 93%
Wind Speed E 7 mph
Barometer 29.92 in (1013.1 mb)
Dewpoint 38°F (3°C)
Visibility 7.00 mi
Wind Chill35°F (2°C)
Last update 17 Feb 5:54 am CST
Extended Forecast for

4 Miles WSW Hardin IL

  • Today

    Today: Mostly cloudy, with a high near 63. South wind 5 to 14 mph, with gusts as high as 30 mph.

    High: 63 °F

    Mostly Cloudy

  • Tonight

    Tonight: A slight chance of rain between 11pm and 3am. Cloudy during the early evening, then gradual clearing, with a low around 52. South wind 11 to 17 mph becoming southwest after midnight. Winds could gust as high as 36 mph. Chance of precipitation is 20%.

    Low: 52 °F

    Slight Chance
    Rain

  • Wednesday

    Wednesday: Sunny, with a high near 71. West wind 5 to 10 mph, with gusts as high as 23 mph.

    High: 71 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 46. South wind 3 to 5 mph.

    Low: 46 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 71. South wind 5 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 40%.

    High: 71 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 35.

    Low: 35 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 48.

    High: 48 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 28.

    Low: 28 °F

    Partly Cloudy

  • Saturday

    Saturday: A 30 percent chance of snow, mainly after noon. Mostly sunny, with a high near 44.

    High: 44 °F

    Chance Snow

Detailed Forecast

Today
Mostly cloudy, with a high near 63. South wind 5 to 14 mph, with gusts as high as 30 mph.
Tonight
A slight chance of rain between 11pm and 3am. Cloudy during the early evening, then gradual clearing, with a low around 52. South wind 11 to 17 mph becoming southwest after midnight. Winds could gust as high as 36 mph. Chance of precipitation is 20%.
Wednesday
Sunny, with a high near 71. West wind 5 to 10 mph, with gusts as high as 23 mph.
Wednesday Night
Partly cloudy, with a low around 46. South wind 3 to 5 mph.
Thursday
A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 71. South wind 5 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 40%.
Thursday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 35.
Friday
Sunny, with a high near 48.
Friday Night
Partly cloudy, with a low around 28.
Saturday
A 30 percent chance of snow, mainly after noon. Mostly sunny, with a high near 44.
Saturday Night
A 20 percent chance of snow before midnight. Mostly clear, with a low around 24.
Sunday
Sunny, with a high near 39.
Sunday Night
Partly cloudy, with a low around 18.
Monday
Sunny, with a high near 40.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WSW Hardin IL
 39.14°N 90.69°W (Elev. 430 ft)
Last Update:
5:01 am CST Feb 17, 2026
Forecast Valid:
6am CST Feb 17, 2026-6pm CST Feb 23, 2026
 
Forecast Discussion
 
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Additional Resources

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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