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

45°F

7°C

Humidity 68%
Wind Speed E 8 mph
Barometer 29.89 in (1012.3 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 7 Jan 7:54 pm CST
Extended Forecast for

3 Miles NNW Brussels IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 45. Southeast wind around 9 mph.

    Low: 45 °F

    Mostly Cloudy

  • Thursday

    Thursday: Rain likely, then showers and possibly a thunderstorm after 3pm. High near 63. Southeast wind 9 to 17 mph, with gusts as high as 34 mph. Chance of precipitation is 80%.

    High: 63 °F

    Showers

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm. Cloudy, then gradually becoming partly cloudy, with a low around 48. South wind 10 to 16 mph becoming west after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 60%.

    Low: 48 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Friday

    Friday: Mostly cloudy, with a high near 53. West wind 6 to 9 mph becoming north in the afternoon.

    High: 53 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 40 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 37. North wind 5 to 8 mph.

    Low: 37 °F

    Chance Rain

  • Saturday

    Saturday: A 20 percent chance of rain before noon. Partly sunny, with a high near 43.

    High: 43 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 33.

    High: 33 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 23.

    Low: 23 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 45. Southeast wind around 9 mph.
Thursday
Rain likely, then showers and possibly a thunderstorm after 3pm. High near 63. Southeast wind 9 to 17 mph, with gusts as high as 34 mph. Chance of precipitation is 80%.
Thursday Night
Showers likely and possibly a thunderstorm. Cloudy, then gradually becoming partly cloudy, with a low around 48. South wind 10 to 16 mph becoming west after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 60%.
Friday
Mostly cloudy, with a high near 53. West wind 6 to 9 mph becoming north in the afternoon.
Friday Night
A 40 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 37. North wind 5 to 8 mph.
Saturday
A 20 percent chance of rain before noon. Partly sunny, with a high near 43.
Saturday Night
Partly cloudy, with a low around 24.
Sunday
Sunny, with a high near 33.
Sunday Night
Mostly clear, with a low around 23.
Monday
Sunny, with a high near 46.
Monday Night
Mostly clear, with a low around 32.
Tuesday
Mostly sunny, with a high near 50.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
A 20 percent chance of rain. Mostly cloudy, with a high near 41.
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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:
5:21 pm CST Jan 7, 2026
Forecast Valid:
8pm CST Jan 7, 2026-6pm CST Jan 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