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.

Partly Cloudy

77°F

25°C

Humidity 64%
Wind Speed N 3 mph
Barometer 29.95 in (1013.5 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 14 Oct 12:54 am CDT
Extended Forecast for

Elsah IL

  • Overnight

    Overnight: Showers and thunderstorms likely, mainly after 2am. Partly cloudy early, then becoming cloudy, with a low around 70. Northwest wind 6 to 8 mph. Chance of precipitation is 60%.

    Low: 70 °F

    T-storms
    Likely

  • Wednesday

    Wednesday: Showers and thunderstorms before 10am, then showers likely and possibly a thunderstorm between 10am and noon, then a chance of showers and thunderstorms after noon. High near 78. West wind around 6 mph becoming north in the afternoon. Chance of precipitation is 90%.

    High: 78 °F

    T-storms then
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Cloudy, with a low around 64. North wind 5 to 7 mph becoming east after midnight. Chance of precipitation is 30%.

    Low: 64 °F

    Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms, mainly before 3pm, then showers likely and possibly a thunderstorm after 5pm. High near 82. East wind 7 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 90%.

    High: 82 °F

    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 7pm, then a chance of showers and thunderstorms between 7pm and 1am. Mostly cloudy, with a low around 47. Breezy, with a northwest wind 10 to 20 mph. Chance of precipitation is 60%.

    Low: 47 °F

    Showers
    Likely and
    Breezy

  • Friday

    Friday: Mostly sunny, with a high near 62. Breezy.

    High: 62 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 39.

    Low: 39 °F

    Clear

Detailed Forecast

Overnight
Showers and thunderstorms likely, mainly after 2am. Partly cloudy early, then becoming cloudy, with a low around 70. Northwest wind 6 to 8 mph. Chance of precipitation is 60%.
Wednesday
Showers and thunderstorms before 10am, then showers likely and possibly a thunderstorm between 10am and noon, then a chance of showers and thunderstorms after noon. High near 78. West wind around 6 mph becoming north in the afternoon. Chance of precipitation is 90%.
Wednesday Night
A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Cloudy, with a low around 64. North wind 5 to 7 mph becoming east after midnight. Chance of precipitation is 30%.
Thursday
Showers and thunderstorms, mainly before 3pm, then showers likely and possibly a thunderstorm after 5pm. High near 82. East wind 7 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 90%.
Thursday Night
Showers likely and possibly a thunderstorm before 7pm, then a chance of showers and thunderstorms between 7pm and 1am. Mostly cloudy, with a low around 47. Breezy, with a northwest wind 10 to 20 mph. Chance of precipitation is 60%.
Friday
Mostly sunny, with a high near 62. Breezy.
Friday Night
Mostly clear, with a low around 37.
Saturday
Sunny, with a high near 65.
Saturday Night
Clear, with a low around 39.
Sunday
Sunny, with a high near 71.
Sunday Night
Partly cloudy, with a low around 46.
Monday
Mostly sunny, with a high near 75.
Monday Night
Partly cloudy, with a low around 49.
Tuesday
Mostly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Elsah IL
 38.93°N 90.39°W (Elev. 427 ft)
Last Update:
11:11 pm CDT Oct 13, 2026
Forecast Valid:
1am CDT Oct 14, 2026-6pm CDT Oct 20, 2026
 
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