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

64°F

18°C

Humidity 43%
Wind Speed W 15 mph
Barometer 29.69 in
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 6 Jan 1:54 pm CST
Extended Forecast for

Brussels IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 65. West wind 9 to 11 mph, with gusts as high as 22 mph.

    High: 65 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 30. Northwest wind 5 to 8 mph becoming calm after midnight.

    Low: 30 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 60. Calm wind becoming south 5 to 8 mph in the morning.

    High: 60 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 44. Southeast wind around 8 mph.

    Low: 44 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Rain. High near 62. Southeast wind 8 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.

    High: 62 °F

    Rain

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 9pm, then a chance of rain, mainly between 9pm and midnight. Mostly cloudy, with a low around 47. Chance of precipitation is 40%.

    Low: 47 °F

    Chance
    Showers

  • Friday

    Friday: Mostly cloudy, with a high near 53.

    High: 53 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 30 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 38.

    Low: 38 °F

    Chance Rain

  • Saturday

    Saturday: Partly sunny, with a high near 45.

    High: 45 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 65. West wind 9 to 11 mph, with gusts as high as 22 mph.
Tonight
Mostly clear, with a low around 30. Northwest wind 5 to 8 mph becoming calm after midnight.
Wednesday
Sunny, with a high near 60. Calm wind becoming south 5 to 8 mph in the morning.
Wednesday Night
Increasing clouds, with a low around 44. Southeast wind around 8 mph.
Thursday
Rain. High near 62. Southeast wind 8 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.
Thursday Night
A chance of showers and thunderstorms before 9pm, then a chance of rain, mainly between 9pm and midnight. Mostly cloudy, with a low around 47. Chance of precipitation is 40%.
Friday
Mostly cloudy, with a high near 53.
Friday Night
A 30 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 38.
Saturday
Partly sunny, with a high near 45.
Saturday Night
Partly cloudy, with a low around 25.
Sunday
Mostly sunny, with a high near 37.
Sunday Night
Mostly clear, with a low around 26.
Monday
Sunny, with a high near 49.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Brussels IL
 38.94°N 90.59°W (Elev. 505 ft)
Last Update:
2:26 pm CST Jan 6, 2026
Forecast Valid:
2pm CST Jan 6, 2026-6pm CST Jan 12, 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