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.

Overcast

56°F

13°C

Humidity 90%
Wind Speed SW 6 mph
Barometer 29.99 in (1015.3 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 5 Mar 2:54 pm CST
Extended Forecast for

4 Miles SSW Hardin IL

  • Tonight

    Tonight: A 40 percent chance of rain and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 53. Calm wind becoming southeast 5 to 8 mph in the evening.

    Low: 53 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: A chance of rain and thunderstorms before 4pm, then a slight chance of rain and thunderstorms after 5pm. Partly sunny, with a high near 73. South wind 9 to 14 mph, with gusts as high as 28 mph. Chance of precipitation is 30%.

    High: 73 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of rain and thunderstorms, then rain and possibly a thunderstorm after midnight. Low around 55. South wind 11 to 15 mph, with gusts as high as 28 mph. Chance of precipitation is 90%.

    Low: 55 °F

    Chance
    T-storms then
    Rain

  • Saturday

    Saturday: A chance of rain and thunderstorms before 9am, then a chance of rain between 9am and noon. Cloudy, then gradually becoming mostly sunny, with a high near 64. Southwest wind 8 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 40%.

    High: 64 °F

    Chance Rain
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 38. Northwest wind 3 to 7 mph.

    Low: 38 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 49.

    Low: 49 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

  • Monday Night

    Monday Night: A slight chance of rain, then a chance of rain and thunderstorms after midnight. Partly cloudy, with a low around 58. Chance of precipitation is 30%.

    Low: 58 °F

    Chance Rain

Detailed Forecast

Tonight
A 40 percent chance of rain and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 53. Calm wind becoming southeast 5 to 8 mph in the evening.
Friday
A chance of rain and thunderstorms before 4pm, then a slight chance of rain and thunderstorms after 5pm. Partly sunny, with a high near 73. South wind 9 to 14 mph, with gusts as high as 28 mph. Chance of precipitation is 30%.
Friday Night
A chance of rain and thunderstorms, then rain and possibly a thunderstorm after midnight. Low around 55. South wind 11 to 15 mph, with gusts as high as 28 mph. Chance of precipitation is 90%.
Saturday
A chance of rain and thunderstorms before 9am, then a chance of rain between 9am and noon. Cloudy, then gradually becoming mostly sunny, with a high near 64. Southwest wind 8 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 40%.
Saturday Night
Partly cloudy, with a low around 38. Northwest wind 3 to 7 mph.
Sunday
Sunny, with a high near 65.
Sunday Night
Clear, with a low around 49.
Monday
Sunny, with a high near 76.
Monday Night
A slight chance of rain, then a chance of rain and thunderstorms after midnight. Partly cloudy, with a low around 58. Chance of precipitation is 30%.
Tuesday
A chance of rain and thunderstorms, then rain and possibly a thunderstorm after noon. High near 77. Chance of precipitation is 80%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 52. Chance of precipitation is 90%.
Wednesday
Rain likely. Mostly cloudy, with a high near 62. Chance of precipitation is 70%.
Wednesday Night
A 20 percent chance of rain. Partly cloudy, with a low around 35.
Thursday
Sunny, with a high near 53.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW Hardin IL
 39.1°N 90.64°W (Elev. 758 ft)
Last Update:
1:56 pm CST Mar 5, 2026
Forecast Valid:
3pm CST Mar 5, 2026-6pm CDT Mar 12, 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