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

40°F

4°C

Humidity 86%
Wind Speed SW 3 mph
Barometer 30.07 in (1018.3 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 8 Mar 12:54 am CDT
Extended Forecast for

3 Miles NNW Brussels IL

  • Overnight

    Overnight: Mostly clear, with a low around 35. West wind 3 to 5 mph.

    Low: 35 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 66. Southwest wind 5 to 10 mph, with gusts as high as 21 mph.

    High: 66 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 45. South wind around 8 mph.

    Low: 45 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 76. South wind 7 to 13 mph, with gusts as high as 24 mph.

    High: 76 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 59. Southwest wind around 9 mph.

    Low: 59 °F

    Mostly Clear

  • Tuesday

    Tuesday: Rain likely, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 81. Chance of precipitation is 70%.

    High: 81 °F

    Slight Chance
    Rain then
    Rain Likely

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 50. Chance of precipitation is 100%.

    Low: 50 °F

    Rain

  • Wednesday

    Wednesday: Rain and possibly a thunderstorm before noon, then a chance of rain. High near 65. Chance of precipitation is 90%.

    High: 65 °F

    Rain then
    Chance Rain

  • Wednesday Night

    Wednesday Night: A slight chance of rain and snow before midnight. Mostly clear, with a low around 31. Chance of precipitation is 20%.

    Low: 31 °F

    Slight Chance
    Rain/Snow
    then Mostly
    Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 35. West wind 3 to 5 mph.
Sunday
Sunny, with a high near 66. Southwest wind 5 to 10 mph, with gusts as high as 21 mph.
Sunday Night
Clear, with a low around 45. South wind around 8 mph.
Monday
Sunny, with a high near 76. South wind 7 to 13 mph, with gusts as high as 24 mph.
Monday Night
Mostly clear, with a low around 59. Southwest wind around 9 mph.
Tuesday
Rain likely, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 81. Chance of precipitation is 70%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 50. Chance of precipitation is 100%.
Wednesday
Rain and possibly a thunderstorm before noon, then a chance of rain. High near 65. Chance of precipitation is 90%.
Wednesday Night
A slight chance of rain and snow before midnight. Mostly clear, with a low around 31. Chance of precipitation is 20%.
Thursday
Sunny, with a high near 53.
Thursday Night
Mostly cloudy, with a low around 45.
Friday
Mostly sunny, with a high near 65.
Friday Night
Mostly cloudy, with a low around 36.
Saturday
Mostly cloudy, with a high near 54.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Brussels IL
 39.01°N 90.61°W (Elev. 610 ft)
Last Update:
12:26 am CST Mar 8, 2026
Forecast Valid:
12am CST Mar 8, 2026-6pm CDT Mar 14, 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