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.

Fair

74°F

23°C

Humidity 57%
Wind Speed SW 6 mph
Barometer 29.84 in (1010.1 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 12 Oct 8:54 pm CDT
Extended Forecast for

Elsah IL

  • Tonight

    Tonight: Mostly clear, with a low around 69. Southwest wind 7 to 10 mph.

    Low: 69 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95. Heat index values as high as 100. Southwest wind 6 to 10 mph.

    High: 95 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 70. South wind 6 to 8 mph. Chance of precipitation is 60%.

    Low: 70 °F

    Partly Cloudy
    then Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 81. Light and variable wind becoming west around 5 mph in the morning. Chance of precipitation is 100%.

    High: 81 °F

    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 65. Light and variable wind becoming east around 5 mph after midnight. Chance of precipitation is 60%.

    Low: 65 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 82. Chance of precipitation is 90%.

    High: 82 °F

    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 52. Chance of precipitation is 30%.

    Low: 52 °F

    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 65. Breezy.

    High: 65 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 69. Southwest wind 7 to 10 mph.
Tuesday
Sunny, with a high near 95. Heat index values as high as 100. Southwest wind 6 to 10 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 70. South wind 6 to 8 mph. Chance of precipitation is 60%.
Wednesday
Showers and possibly a thunderstorm. High near 81. Light and variable wind becoming west around 5 mph in the morning. Chance of precipitation is 100%.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 65. Light and variable wind becoming east around 5 mph after midnight. Chance of precipitation is 60%.
Thursday
Showers and possibly a thunderstorm. High near 82. Chance of precipitation is 90%.
Thursday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 52. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 65. Breezy.
Friday Night
Mostly clear, with a low around 40.
Saturday
Sunny, with a high near 64.
Saturday Night
Mostly clear, with a low around 40.
Sunday
Sunny, with a high near 71.
Sunday Night
Partly cloudy, with a low around 48.
Monday
Mostly sunny, with a high near 77.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Elsah IL
 38.96°N 90.36°W (Elev. 492 ft)
Last Update:
8:41 pm CDT Oct 12, 2026
Forecast Valid:
9pm CDT Oct 12, 2026-6pm CDT Oct 19, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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