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.

Mostly Cloudy

49°F

9°C

Humidity 59%
Wind Speed NE 9 mph
Barometer 30.27 in (1025.1 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 20 Apr 12:54 am CDT
Extended Forecast for

2 Miles SW Brussels IL

  • Overnight

    Overnight: Partly cloudy, with a low around 41. Northeast wind around 5 mph.

    Low: 41 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 70. Light and variable wind becoming southeast 5 to 8 mph in the morning.

    High: 70 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 51. Southeast wind around 8 mph.

    Low: 51 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 80. Southwest wind 8 to 15 mph, with gusts as high as 26 mph.

    High: 80 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 58. Southwest wind 8 to 11 mph, with gusts as high as 20 mph.

    Low: 58 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 61. Chance of precipitation is 80%.

    Low: 61 °F

    Chance
    T-storms then
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 41. Northeast wind around 5 mph.
Monday
Sunny, with a high near 70. Light and variable wind becoming southeast 5 to 8 mph in the morning.
Monday Night
Mostly clear, with a low around 51. Southeast wind around 8 mph.
Tuesday
Sunny, with a high near 80. Southwest wind 8 to 15 mph, with gusts as high as 26 mph.
Tuesday Night
Mostly clear, with a low around 58. Southwest wind 8 to 11 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 60.
Thursday
Mostly sunny, with a high near 82.
Thursday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 61. Chance of precipitation is 80%.
Friday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 75. Chance of precipitation is 60%.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 52.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 69.
Saturday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 49.
Sunday
A 30 percent chance of showers. Mostly sunny, with a high near 69.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SW Brussels IL
 38.92°N 90.62°W (Elev. 502 ft)
Last Update:
12:41 am CDT Apr 20, 2026
Forecast Valid:
1am CDT Apr 20, 2026-6pm CDT Apr 26, 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