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

83°F

28°C

Humidity 72%
Wind Speed S 12 mph
Barometer 29.91 in (1012.4 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 20 Jun 9:54 pm CDT
Extended Forecast for

Elsah IL

Extreme Heat Warning June 21, 12:00pm until June 24, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning

  • Tonight

    Tonight: Clear, with a low around 76. South wind 7 to 10 mph.

    Low: 76 °F

    Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 97. Heat index values as high as 105. Southwest wind 9 to 16 mph, with gusts as high as 26 mph.

    High: 97 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 75. South wind 8 to 13 mph, with gusts as high as 22 mph.

    Low: 75 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 96. Heat index values as high as 103. Southwest wind 7 to 11 mph, with gusts as high as 20 mph.

    High: 96 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 77. South wind 6 to 10 mph.

    Low: 77 °F

    Clear

  • Monday

    Monday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Monday Night

    Monday Night: Partly cloudy, with a low around 76.

    Low: 76 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 94.

    High: 94 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 76.

    Low: 76 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 76. South wind 7 to 10 mph.
Saturday
Sunny and hot, with a high near 97. Heat index values as high as 105. Southwest wind 9 to 16 mph, with gusts as high as 26 mph.
Saturday Night
Mostly clear, with a low around 75. South wind 8 to 13 mph, with gusts as high as 22 mph.
Sunday
Sunny, with a high near 96. Heat index values as high as 103. Southwest wind 7 to 11 mph, with gusts as high as 20 mph.
Sunday Night
Clear, with a low around 77. South wind 6 to 10 mph.
Monday
Sunny and hot, with a high near 97.
Monday Night
Partly cloudy, with a low around 76.
Tuesday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 94.
Tuesday Night
Partly cloudy, with a low around 76.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 94.
Wednesday Night
Partly cloudy, with a low around 75.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Elsah IL
 38.96°N 90.36°W (Elev. 492 ft)
Last Update:
9:37 pm CDT Jun 20, 2025
Forecast Valid:
10pm CDT Jun 20, 2025-6pm CDT Jun 27, 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