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.

Fair

78°F

26°C

Humidity 50%
Wind Speed SW 3 mph
Barometer 30.04 in (1016.9 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 19 Jun 10:54 am CDT
Extended Forecast for

3 Miles NNW Brussels IL

Flood Warning until further notice
Click here for hazard details and duration
Flood Warning until further notice
  •  
    Flood Warning until further notice

    NOW until further notice

    Flood Warning

  • Juneteenth

    High: 82 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Scattered showers, mainly after 4am. Mostly cloudy, with a low around 64. Calm wind. Chance of precipitation is 30%.

    Low: 64 °F

    Mostly Cloudy
    then
    Scattered
    Showers

  • Saturday

    Saturday: Scattered showers, mainly before 7am. Mostly cloudy, then gradually becoming sunny, with a high near 84. Calm wind. Chance of precipitation is 30%.

    High: 84 °F

    Scattered
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 66. Light and variable wind becoming southeast around 5 mph after midnight. Chance of precipitation is 50%.

    Low: 66 °F

    Slight Chance
    Showers then
    Chance
    Showers

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm, then showers and thunderstorms after 7am. High near 82. Southeast wind 7 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 100%.

    High: 82 °F

    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms, mainly before 1am. Low around 64. Chance of precipitation is 80%.

    Low: 64 °F

    T-storms

  • Monday

    Monday: Partly sunny, with a high near 77.

    High: 77 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy

Detailed Forecast

Juneteenth
Increasing clouds, with a high near 82. Calm wind.
Tonight
Scattered showers, mainly after 4am. Mostly cloudy, with a low around 64. Calm wind. Chance of precipitation is 30%.
Saturday
Scattered showers, mainly before 7am. Mostly cloudy, then gradually becoming sunny, with a high near 84. Calm wind. Chance of precipitation is 30%.
Saturday Night
A chance of showers, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 66. Light and variable wind becoming southeast around 5 mph after midnight. Chance of precipitation is 50%.
Sunday
Showers likely and possibly a thunderstorm, then showers and thunderstorms after 7am. High near 82. Southeast wind 7 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 100%.
Sunday Night
Showers and thunderstorms, mainly before 1am. Low around 64. Chance of precipitation is 80%.
Monday
Partly sunny, with a high near 77.
Monday Night
Partly cloudy, with a low around 59.
Tuesday
Mostly sunny, with a high near 79.
Tuesday Night
Partly cloudy, with a low around 62.
Wednesday
Mostly sunny, with a high near 82.
Wednesday Night
Mostly clear, with a low around 62.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 81.
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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:
10:36 am CDT Jun 19, 2026
Forecast Valid:
11am CDT Jun 19, 2026-6pm CDT Jun 25, 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