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

70°F

21°C

Humidity 93%
Wind Speed E 5 mph
Barometer 29.99 in (1015.1 mb)
Dewpoint 68°F (20°C)
Visibility 8.00 mi
Last update 6 Jul 5:54 am CDT
Extended Forecast for

Hardin IL

  • Today

    Today: A 20 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 83. Calm wind becoming north 5 to 7 mph in the morning.

    High: 83 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 66. North wind 3 to 6 mph.

    Low: 66 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 85. Northeast wind 5 to 7 mph.

    High: 85 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 66. Light east wind.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88. Calm wind.

    High: 88 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 72. Chance of precipitation is 70%.

    Low: 72 °F

    Chance
    T-storms then
    T-storms
    Likely

  • Friday

    Friday: Showers and thunderstorms likely, mainly before 1pm. Mostly cloudy, with a high near 87. Chance of precipitation is 60%.

    High: 87 °F

    T-storms
    Likely

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 83. Calm wind becoming north 5 to 7 mph in the morning.
Tonight
Partly cloudy, with a low around 66. North wind 3 to 6 mph.
Tuesday
Sunny, with a high near 85. Northeast wind 5 to 7 mph.
Tuesday Night
Mostly clear, with a low around 66. Light east wind.
Wednesday
Sunny, with a high near 88. Calm wind.
Wednesday Night
Mostly clear, with a low around 70.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90.
Thursday Night
Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 72. Chance of precipitation is 70%.
Friday
Showers and thunderstorms likely, mainly before 1pm. Mostly cloudy, with a high near 87. Chance of precipitation is 60%.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 70. Chance of precipitation is 60%.
Saturday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Hardin IL
 39.16°N 90.64°W (Elev. 692 ft)
Last Update:
5:52 am CDT Jul 6, 2026
Forecast Valid:
6am CDT Jul 6, 2026-6pm CDT Jul 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