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

72°F

22°C

Humidity 91%
Wind Speed Calm
Barometer 30.00 in (1015.6 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 14 Oct 6:54 pm CDT
Extended Forecast for

Brussels IL

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 66. Calm wind becoming east around 5 mph after midnight. Chance of precipitation is 60%.

    Low: 66 °F

    Mostly Cloudy
    then Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm, mainly before noon, then a chance of showers and thunderstorms after noon. High near 81. East wind 5 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 90%.

    High: 81 °F

    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Mostly cloudy, with a low around 48. Southwest wind 8 to 17 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 50%.

    Low: 48 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 57. Breezy, with a northwest wind around 21 mph, with gusts as high as 32 mph.

    High: 57 °F

    Breezy.
    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 40. North wind 7 to 16 mph, with gusts as high as 24 mph.

    Low: 40 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 39.

    Low: 39 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 69.

    High: 69 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

Detailed Forecast

Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 66. Calm wind becoming east around 5 mph after midnight. Chance of precipitation is 60%.
Thursday
Showers and possibly a thunderstorm, mainly before noon, then a chance of showers and thunderstorms after noon. High near 81. East wind 5 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 90%.
Thursday Night
A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Mostly cloudy, with a low around 48. Southwest wind 8 to 17 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 50%.
Friday
A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 57. Breezy, with a northwest wind around 21 mph, with gusts as high as 32 mph.
Friday Night
Partly cloudy, with a low around 40. North wind 7 to 16 mph, with gusts as high as 24 mph.
Saturday
Sunny, with a high near 62.
Saturday Night
Clear, with a low around 39.
Sunday
Sunny, with a high near 69.
Sunday Night
Mostly clear, with a low around 43.
Monday
Mostly sunny, with a high near 74.
Monday Night
Partly cloudy, with a low around 46.
Tuesday
Mostly sunny, with a high near 77.
Tuesday Night
Mostly clear, with a low around 52.
Wednesday
Sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Brussels IL
 38.96°N 90.59°W (Elev. 499 ft)
Last Update:
7:26 pm CDT Oct 14, 2026
Forecast Valid:
7pm CDT Oct 14, 2026-6pm CDT Oct 21, 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