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.

Overcast

73°F

23°C

Humidity 96%
Wind Speed E 5 mph
Barometer 29.89 in (1011.6 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 27 Jun 12:54 am CDT
Extended Forecast for

Elsah IL

  • Overnight

    Overnight: A slight chance of showers and thunderstorms. Patchy fog after 2am. Otherwise, mostly cloudy, with a steady temperature around 72. Calm wind. Chance of precipitation is 20%.

    Low: 72 °F

    Slight Chance
    T-storms and
    Patchy Fog

  • Saturday

    Saturday: A chance of showers and thunderstorms before 2pm, then a slight chance of showers and thunderstorms after 4pm. Areas of fog before 9am. Otherwise, mostly cloudy, with a high near 85. Light and variable wind. Chance of precipitation is 30%.

    High: 85 °F

    Chance
    Showers and
    Areas Fog
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms, mainly between 10pm and 5am. Increasing clouds, with a low around 72. Southeast wind 3 to 5 mph.

    Low: 72 °F

    Chance
    T-storms

  • Sunday

    Sunday: Mostly cloudy through mid morning, then gradual clearing, with a high near 94. Heat index values as high as 107. South wind 6 to 11 mph.

    High: 94 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75. South wind 6 to 10 mph.

    Low: 75 °F

    Mostly Clear

  • Monday

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

    High: 97 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 76.

    Low: 76 °F

    Clear

Detailed Forecast

Overnight
A slight chance of showers and thunderstorms. Patchy fog after 2am. Otherwise, mostly cloudy, with a steady temperature around 72. Calm wind. Chance of precipitation is 20%.
Saturday
A chance of showers and thunderstorms before 2pm, then a slight chance of showers and thunderstorms after 4pm. Areas of fog before 9am. Otherwise, mostly cloudy, with a high near 85. Light and variable wind. Chance of precipitation is 30%.
Saturday Night
A 40 percent chance of showers and thunderstorms, mainly between 10pm and 5am. Increasing clouds, with a low around 72. Southeast wind 3 to 5 mph.
Sunday
Mostly cloudy through mid morning, then gradual clearing, with a high near 94. Heat index values as high as 107. South wind 6 to 11 mph.
Sunday Night
Mostly clear, with a low around 75. South wind 6 to 10 mph.
Monday
Sunny and hot, with a high near 97.
Monday Night
Mostly clear, with a low around 76.
Tuesday
Sunny and hot, with a high near 98.
Tuesday Night
Clear, with a low around 76.
Wednesday
Sunny and hot, with a high near 97.
Wednesday Night
Mostly clear, with a low around 77.
Thursday
Sunny, with a high near 96.
Thursday Night
Mostly clear, with a low around 76.
Friday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 95.
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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:
1:21 am CDT Jun 27, 2026
Forecast Valid:
1am CDT Jun 27, 2026-6pm CDT Jul 3, 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