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.

Mostly Cloudy

74°F

23°C

Humidity 79%
Wind Speed Calm
Barometer 29.94 in (1013.3 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 25 Jun 5:54 pm CDT
Extended Forecast for

Hardin ILSimilar City Names

Flood Warning until further notice
Flood Watch June 25, 06:05pm until June 26, 07:00pm
Click here for hazard details and duration
Flood Warning until further notice
Flood Watch
  •  
    Flood Warning until further notice
    Flood Watch June 25, 06:05pm until June 26, 07:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Tonight

    Low: 67 °F

    Showers

  • Friday

    Friday: Showers and thunderstorms before 1pm, then showers likely and possibly a thunderstorm between 1pm and 2pm, then a chance of showers and thunderstorms after 2pm. High near 79. Southeast wind 6 to 8 mph becoming north in the afternoon. Chance of precipitation is 90%.

    High: 79 °F

    Showers then
    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Mostly cloudy, with a low around 65. Northeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    Showers

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83. Light and variable wind.

    High: 83 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71. Southeast wind 3 to 5 mph.

    Low: 71 °F

    Chance
    T-storms

  • Sunday

    Sunday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

Detailed Forecast

Tonight
Showers and possibly a thunderstorm. Low around 67. Calm wind becoming southeast around 6 mph after midnight. Chance of precipitation is 90%.
Friday
Showers and thunderstorms before 1pm, then showers likely and possibly a thunderstorm between 1pm and 2pm, then a chance of showers and thunderstorms after 2pm. High near 79. Southeast wind 6 to 8 mph becoming north in the afternoon. Chance of precipitation is 90%.
Friday Night
A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Mostly cloudy, with a low around 65. Northeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 30%.
Saturday
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83. Light and variable wind.
Saturday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71. Southeast wind 3 to 5 mph.
Sunday
Sunny, with a high near 94.
Sunday Night
Mostly clear, with a low around 74.
Monday
Sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 75.
Tuesday
Sunny and hot, with a high near 98.
Tuesday Night
Clear, with a low around 75.
Wednesday
Sunny and hot, with a high near 97.
Wednesday Night
Mostly clear, with a low around 75.
Thursday
Sunny, with a high near 96.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hardin ILSimilar City Names
 39.14°N 90.61°W (Elev. 427 ft)
Last Update:
5:26 pm CDT Jun 25, 2026
Forecast Valid:
6pm CDT Jun 25, 2026-6pm CDT Jul 2, 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