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

65°F

18°C

Humidity 68%
Wind Speed E 7 mph
Barometer 29.92 in (1012.7 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 29 Sep 11:54 pm CDT
Extended Forecast for

Brussels IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 67. Southeast wind 3 to 6 mph.

    Low: 67 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Cloudy, then becoming mostly sunny during the afternoon, with a high near 89. Southeast wind 5 to 10 mph becoming southwest in the afternoon.

    High: 89 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 72. South wind 6 to 8 mph, with gusts as high as 20 mph.

    Low: 72 °F

    Mostly Cloudy

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 86. Southwest wind around 9 mph. Chance of precipitation is 50%.

    High: 86 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 66. Southwest wind 5 to 7 mph becoming northwest after midnight. Chance of precipitation is 90%.

    Low: 66 °F

    Showers

  • Friday

    Friday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 72. Chance of precipitation is 60%.

    High: 72 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers after 1pm. Partly sunny, with a high near 69.

    High: 69 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 67. Southeast wind 3 to 6 mph.
Wednesday
Cloudy, then becoming mostly sunny during the afternoon, with a high near 89. Southeast wind 5 to 10 mph becoming southwest in the afternoon.
Wednesday Night
Mostly cloudy, with a low around 72. South wind 6 to 8 mph, with gusts as high as 20 mph.
Thursday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 86. Southwest wind around 9 mph. Chance of precipitation is 50%.
Thursday Night
Showers and possibly a thunderstorm. Low around 66. Southwest wind 5 to 7 mph becoming northwest after midnight. Chance of precipitation is 90%.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 72. Chance of precipitation is 60%.
Friday Night
Mostly cloudy, with a low around 55.
Saturday
A 20 percent chance of showers after 1pm. Partly sunny, with a high near 69.
Saturday Night
Partly cloudy, with a low around 54.
Sunday
Sunny, with a high near 71.
Sunday Night
Mostly clear, with a low around 51.
Monday
Sunny, with a high near 68.
Monday Night
Mostly clear, with a low around 50.
Tuesday
Sunny, with a high near 70.
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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:
9:41 pm CDT Sep 29, 2026
Forecast Valid:
11pm CDT Sep 29, 2026-6pm CDT Oct 6, 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