National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

76°F

24°C

Humidity 94%
Wind Speed Calm
Barometer 30.12 in (1019.3 mb)
Dewpoint 74°F (23°C)
Visibility 9.00 mi
Heat Index76°F (24°C)
Last update 25 Jun 3:54 am CDT
Extended Forecast for

Hardin IL

Heat Advisory June 25, 04:34am until June 26, 09:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory June 25, 04:34am until June 26, 09:00pm

    NOW until 9:00pm Thu

    Heat Advisory

  • Today

    High: 95 °F

    Sunny then
    Scattered
    T-storms

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 75. South wind 5 to 7 mph. Chance of precipitation is 30%.

    Low: 75 °F

    Scattered
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 95. Heat index values as high as 102. Southwest wind 5 to 9 mph.

    High: 95 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 75. Southwest wind around 6 mph.

    Low: 75 °F

    Partly Cloudy

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Southwest wind 5 to 8 mph.

    High: 90 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.

    Low: 73 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.

    High: 91 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 74.

    Low: 74 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
Scattered showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 95. Heat index values as high as 103. Calm wind becoming southwest 5 to 7 mph in the morning. Chance of precipitation is 30%.
Tonight
Scattered showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 75. South wind 5 to 7 mph. Chance of precipitation is 30%.
Thursday
Sunny, with a high near 95. Heat index values as high as 102. Southwest wind 5 to 9 mph.
Thursday Night
Partly cloudy, with a low around 75. Southwest wind around 6 mph.
Friday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Southwest wind 5 to 8 mph.
Friday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Saturday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Saturday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 74.
Sunday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73.
Monday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
Monday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
Tuesday
A 20 percent chance of showers. Mostly sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hardin IL
 39.16°N 90.61°W (Elev. 427 ft)
Last Update:
3:21 am CDT Jun 25, 2025
Forecast Valid:
4am CDT Jun 25, 2025-6pm CDT Jul 1, 2025
 
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