National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Mostly Cloudy

61°F

16°C

Humidity 90%
Wind Speed W 8 mph
Barometer 29.87 in (1011.2 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 7 Mar 9:54 am CST
Extended Forecast for

3 Miles NNW Brussels IL

  • Today

    Today: Cloudy, with a temperature falling to around 46 by 4pm. Southwest wind 5 to 10 mph becoming west 12 to 17 mph in the afternoon. Winds could gust as high as 36 mph.

    High: 61 °F⇓

    Cloudy

  • Tonight

    Tonight: Partly cloudy, with a low around 35. Northwest wind 5 to 9 mph becoming light and variable.

    Low: 35 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 66. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 66 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 46. South wind around 8 mph.

    Low: 46 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 78. Southwest wind 8 to 14 mph, with gusts as high as 24 mph.

    High: 78 °F

    Sunny

  • Monday Night

    Monday Night: A 30 percent chance of rain after midnight. Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear
    then Chance
    Rain

  • Tuesday

    Tuesday: A chance of rain and thunderstorms, then rain and possibly a thunderstorm after noon. High near 79. Chance of precipitation is 80%.

    High: 79 °F

    Chance Rain
    then Rain

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 50. Chance of precipitation is 90%.

    Low: 50 °F

    Rain

  • Wednesday

    Wednesday: Rain and possibly a thunderstorm before noon, then a chance of rain. High near 61. Chance of precipitation is 80%.

    High: 61 °F

    Rain then
    Chance Rain

Detailed Forecast

Today
Cloudy, with a temperature falling to around 46 by 4pm. Southwest wind 5 to 10 mph becoming west 12 to 17 mph in the afternoon. Winds could gust as high as 36 mph.
Tonight
Partly cloudy, with a low around 35. Northwest wind 5 to 9 mph becoming light and variable.
Sunday
Sunny, with a high near 66. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday Night
Clear, with a low around 46. South wind around 8 mph.
Monday
Sunny, with a high near 78. Southwest wind 8 to 14 mph, with gusts as high as 24 mph.
Monday Night
A 30 percent chance of rain after midnight. Mostly clear, with a low around 59.
Tuesday
A chance of rain and thunderstorms, then rain and possibly a thunderstorm after noon. High near 79. Chance of precipitation is 80%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 50. Chance of precipitation is 90%.
Wednesday
Rain and possibly a thunderstorm before noon, then a chance of rain. High near 61. Chance of precipitation is 80%.
Wednesday Night
Partly cloudy, with a low around 33.
Thursday
Mostly sunny, with a high near 54.
Thursday Night
Mostly cloudy, with a low around 41.
Friday
Partly sunny, with a high near 65.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Brussels IL
 39.01°N 90.61°W (Elev. 610 ft)
Last Update:
10:31 am CST Mar 7, 2026
Forecast Valid:
10am CST Mar 7, 2026-6pm CDT Mar 13, 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