Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

A Few Clouds

79°F

26°C

Humidity 74%
Wind Speed SW 6 mph
Barometer 29.91 in (1012.1 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 19 Aug 1:54 pm CDT
Extended Forecast for

3 Miles NNW Brussels IL

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms.  Cloudy, with a high near 81. Light and variable wind.

    High: 81 °F

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 3am.  Patchy fog after 5am.  Otherwise, mostly cloudy, with a low around 68. Light northeast wind.  Chance of precipitation is 30%.

    Low: 68 °F

    Chance
    Showers and
    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am.  Otherwise, partly sunny, with a high near 83. Northeast wind 3 to 5 mph.

    High: 83 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 66. Light northeast wind.

    Low: 66 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 86. Light and variable wind.

    High: 86 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms after 1am.  Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers before 1pm.  Mostly sunny, with a high near 85.

    High: 85 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Cloudy, with a high near 81. Light and variable wind.
Tonight
A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 3am. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 68. Light northeast wind. Chance of precipitation is 30%.
Thursday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 83. Northeast wind 3 to 5 mph.
Thursday Night
Mostly clear, with a low around 66. Light northeast wind.
Friday
Sunny, with a high near 86. Light and variable wind.
Friday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 67.
Saturday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 85.
Saturday Night
Mostly clear, with a low around 65.
Sunday
Mostly sunny, with a high near 83.
Sunday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 83.
Monday Night
Partly cloudy, with a low around 67.
Tuesday
Mostly sunny, with a high near 86.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Brussels IL
 39.01°N 90.61°W (Elev. 610 ft)
1:26 pm CDT Aug 19, 2026
2pm CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
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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