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

55°F

13°C

Humidity 80%
Wind Speed S 15 G 25 mph
Barometer 29.67 in (1004.6 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Wind Chill51°F (11°C)
Last update 17 Feb 6:54 pm CST
Extended Forecast for

Elsah IL

  • Tonight

    Tonight: A slight chance of showers between midnight and 3am. Cloudy, then gradually becoming partly cloudy, with a temperature rising to around 57 by 5am. South wind 14 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.

    Low: 52 °F⇑

    Cloudy then
    Slight Chance
    Showers

  • Wednesday

    Wednesday: Sunny, with a high near 71. West wind 6 to 13 mph, with gusts as high as 22 mph.

    High: 71 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 48. Southeast wind around 6 mph.

    Low: 48 °F

    Increasing
    Clouds

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 72. Southeast wind 6 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 40%.

    High: 72 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 36. West wind 11 to 16 mph, with gusts as high as 24 mph.

    Low: 36 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 49.

    High: 49 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

  • Saturday

    Saturday: A 40 percent chance of snow, mainly after noon. Mostly sunny, with a high near 42.

    High: 42 °F

    Chance Snow

  • Saturday Night

    Saturday Night: A 30 percent chance of snow, mainly before midnight. Partly cloudy, with a low around 26.

    Low: 26 °F

    Chance Snow

Detailed Forecast

Tonight
A slight chance of showers between midnight and 3am. Cloudy, then gradually becoming partly cloudy, with a temperature rising to around 57 by 5am. South wind 14 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.
Wednesday
Sunny, with a high near 71. West wind 6 to 13 mph, with gusts as high as 22 mph.
Wednesday Night
Increasing clouds, with a low around 48. Southeast wind around 6 mph.
Thursday
A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 72. Southeast wind 6 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 40%.
Thursday Night
Mostly clear, with a low around 36. West wind 11 to 16 mph, with gusts as high as 24 mph.
Friday
Sunny, with a high near 49.
Friday Night
Partly cloudy, with a low around 30.
Saturday
A 40 percent chance of snow, mainly after noon. Mostly sunny, with a high near 42.
Saturday Night
A 30 percent chance of snow, mainly before midnight. Partly cloudy, with a low around 26.
Sunday
A 20 percent chance of snow before noon. Sunny, with a high near 38.
Sunday Night
Mostly clear, with a low around 19.
Monday
Sunny, with a high near 37.
Monday Night
Partly cloudy, with a low around 21.
Tuesday
Mostly sunny, with a high near 47.
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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:
5:11 pm CST Feb 17, 2026
Forecast Valid:
7pm CST Feb 17, 2026-6pm CST Feb 24, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation