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

83°F

28°C

Humidity 36%
Wind Speed Vrbl 3 mph
Barometer 30.01 in (1015.6 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 19 Jun 2:54 pm CDT
Extended Forecast for

5 Miles WSW Hardin IL

  • Tonight

    Tonight: Scattered showers, mainly after 4am. Mostly cloudy, with a low around 65. Calm wind. Chance of precipitation is 30%.

    Low: 65 °F

    Mostly Cloudy
    then
    Scattered
    Showers

  • Saturday

    Saturday: Scattered showers, mainly before 7am. Mostly cloudy, then gradually becoming sunny, with a high near 84. Calm wind. Chance of precipitation is 30%.

    High: 84 °F

    Scattered
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers before 3am, then a chance of showers and thunderstorms between 3am and 5am, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 67. Light and variable wind. Chance of precipitation is 60%.

    Low: 67 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm, then showers and thunderstorms after 7am. Some of the storms could produce heavy rainfall. High near 80. Southeast wind 5 to 10 mph becoming southwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 100%.

    High: 80 °F

    Heavy Rain

  • Sunday Night

    Sunday Night: Showers and thunderstorms, mainly before 1am. Low around 65. West wind 6 to 8 mph becoming north after midnight. Chance of precipitation is 80%.

    Low: 65 °F

    T-storms

  • Monday

    Monday: Partly sunny, with a high near 77.

    High: 77 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

Detailed Forecast

Tonight
Scattered showers, mainly after 4am. Mostly cloudy, with a low around 65. Calm wind. Chance of precipitation is 30%.
Saturday
Scattered showers, mainly before 7am. Mostly cloudy, then gradually becoming sunny, with a high near 84. Calm wind. Chance of precipitation is 30%.
Saturday Night
A chance of showers before 3am, then a chance of showers and thunderstorms between 3am and 5am, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 67. Light and variable wind. Chance of precipitation is 60%.
Sunday
Showers likely and possibly a thunderstorm, then showers and thunderstorms after 7am. Some of the storms could produce heavy rainfall. High near 80. Southeast wind 5 to 10 mph becoming southwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 100%.
Sunday Night
Showers and thunderstorms, mainly before 1am. Low around 65. West wind 6 to 8 mph becoming north after midnight. Chance of precipitation is 80%.
Monday
Partly sunny, with a high near 77.
Monday Night
Partly cloudy, with a low around 61.
Tuesday
Mostly sunny, with a high near 79.
Tuesday Night
Partly cloudy, with a low around 62.
Wednesday
Sunny, with a high near 81.
Wednesday Night
Mostly clear, with a low around 62.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 80.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 63.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WSW Hardin IL
 39.12°N 90.69°W (Elev. 430 ft)
Last Update:
2:31 pm CDT Jun 19, 2026
Forecast Valid:
4pm CDT Jun 19, 2026-6pm CDT Jun 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