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

53°F

12°C

Humidity 83%
Wind Speed E 8 mph
Barometer 30.04 in (1016.8 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 10 Oct 5:54 am CDT
Extended Forecast for

Brussels IL

  • Today

    Today: Mostly cloudy, with a high near 83. Southeast wind 5 to 8 mph.

    High: 83 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 54. East wind 5 to 7 mph becoming calm after midnight.

    Low: 54 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 88. Light and variable wind.

    High: 88 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 64. Light and variable wind becoming southwest around 6 mph in the evening.

    Low: 64 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 94. Southwest wind 7 to 15 mph.

    High: 94 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 71.

    Low: 71 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly clear, with a low around 63.

    Low: 63 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 80. Chance of precipitation is 70%.

    High: 80 °F

    Showers
    Likely

Detailed Forecast

Today
Mostly cloudy, with a high near 83. Southeast wind 5 to 8 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 54. East wind 5 to 7 mph becoming calm after midnight.
Sunday
Sunny, with a high near 88. Light and variable wind.
Sunday Night
Mostly clear, with a low around 64. Light and variable wind becoming southwest around 6 mph in the evening.
Columbus Day
Sunny, with a high near 94. Southwest wind 7 to 15 mph.
Monday Night
Mostly clear, with a low around 71.
Tuesday
Sunny, with a high near 90.
Tuesday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly clear, with a low around 63.
Wednesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 80. Chance of precipitation is 70%.
Wednesday Night
A chance of showers, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 59. Chance of precipitation is 60%.
Thursday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 78. Chance of precipitation is 60%.
Thursday Night
A 30 percent chance of showers. Partly cloudy, with a low around 53.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 70.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Brussels IL
 38.94°N 90.59°W (Elev. 505 ft)
Last Update:
5:16 am CDT Oct 10, 2026
Forecast Valid:
6am CDT Oct 10, 2026-6pm CDT Oct 16, 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