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.

Partly Cloudy

73°F

23°C

Humidity 43%
Wind Speed SW 8 mph
Barometer 29.95 in (1013.7 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 12 May 9:54 pm CDT
Extended Forecast for

4 Miles WNW Brussels IL

  • Tonight

    Tonight: A slight chance of showers between 11pm and midnight. Mostly cloudy early, then gradual clearing, with a low around 56. Light and variable wind becoming west 5 to 8 mph after midnight. Chance of precipitation is 20%.

    Low: 56 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 74. Northwest wind 7 to 13 mph, with gusts as high as 22 mph.

    High: 74 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 49. North wind 5 to 7 mph becoming calm in the evening.

    Low: 49 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 76. Calm wind becoming southeast 5 to 8 mph in the morning.

    High: 76 °F

    Sunny

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 58. Southeast wind 10 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.

    Low: 58 °F

    Mostly Cloudy
    then Showers
    Likely

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 87.

    High: 87 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 65.

    Low: 65 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.

    High: 88 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.

    Low: 66 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A slight chance of showers between 11pm and midnight. Mostly cloudy early, then gradual clearing, with a low around 56. Light and variable wind becoming west 5 to 8 mph after midnight. Chance of precipitation is 20%.
Wednesday
Sunny, with a high near 74. Northwest wind 7 to 13 mph, with gusts as high as 22 mph.
Wednesday Night
Clear, with a low around 49. North wind 5 to 7 mph becoming calm in the evening.
Thursday
Sunny, with a high near 76. Calm wind becoming southeast 5 to 8 mph in the morning.
Thursday Night
Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 58. Southeast wind 10 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.
Friday
A 50 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 87.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 65.
Saturday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Saturday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Monday
Showers and thunderstorms likely. Partly sunny, with a high near 89. Chance of precipitation is 60%.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. Chance of precipitation is 60%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW Brussels IL
 38.99°N 90.64°W (Elev. 561 ft)
Last Update:
9:21 pm CDT May 12, 2026
Forecast Valid:
10pm CDT May 12, 2026-6pm CDT May 19, 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