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

95°F

35°C

Humidity 56%
Wind Speed SE 7 mph
Barometer 29.97 in (1014.3 mb)
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index110°F (43°C)
Last update 17 Aug 3:54 pm CDT
Extended Forecast for

2 Miles S Hardin IL

Heat Advisory August 17, 05:37pm until August 18, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 17, 05:37pm until August 18, 08:00pm

    NOW until 8:00pm Mon

    Heat Advisory

  • Tonight

    Low: 77 °F

    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 94. Heat index values as high as 103. Southeast wind 3 to 6 mph.

    High: 94 °F

    Sunny then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. Light southeast wind. Chance of precipitation is 20%.

    Low: 74 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91. Heat index values as high as 101. Calm wind becoming west around 5 mph in the afternoon.

    High: 91 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 71. Light north wind. Chance of precipitation is 30%.

    Low: 71 °F

    Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm. Mostly sunny, with a high near 84. Chance of precipitation is 20%.

    High: 84 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

Detailed Forecast

Tonight
Partly cloudy, with a low around 77. Southeast wind 3 to 5 mph.
Monday
A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 94. Heat index values as high as 103. Southeast wind 3 to 6 mph.
Monday Night
A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. Light southeast wind. Chance of precipitation is 20%.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91. Heat index values as high as 101. Calm wind becoming west around 5 mph in the afternoon.
Tuesday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 71. Light north wind. Chance of precipitation is 30%.
Wednesday
A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm. Mostly sunny, with a high near 84. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 66.
Thursday
Mostly sunny, with a high near 83.
Thursday Night
Mostly clear, with a low around 66.
Friday
Sunny, with a high near 85.
Friday Night
Mostly clear, with a low around 66.
Saturday
Sunny, with a high near 85.
Saturday Night
Mostly clear, with a low around 61.
Sunday
Sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles S Hardin IL
 39.12°N 90.61°W (Elev. 420 ft)
Last Update:
5:31 pm CDT Aug 17, 2025
Forecast Valid:
5pm CDT Aug 17, 2025-6pm CDT Aug 24, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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