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.

Mostly Cloudy

73°F

23°C

Humidity 90%
Wind Speed Calm
Barometer 29.93 in (1013.0 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 19 Aug 1:54 am CDT
Extended Forecast for

4 Miles WSW Hardin IL

  • Overnight

    Overnight: Showers and thunderstorms, mainly after 3am.  Low around 68. Calm wind.  Chance of precipitation is 80%.

    Low: 68 °F

    T-storms

  • Wednesday

    Wednesday: Showers and thunderstorms, mainly before 4pm.  High near 81. Light and variable wind.  Chance of precipitation is 80%.

    High: 81 °F

    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 7pm.  Partly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Chance
    T-storms then
    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 84. Light northeast wind.

    High: 84 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 63. Calm wind.

    Low: 63 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms before 1am.  Mostly clear, with a low around 66.

    Low: 66 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers, with thunderstorms also possible after 1pm.  Sunny, with a high near 86. Chance of precipitation is 20%.

    High: 86 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

Detailed Forecast

Overnight
Showers and thunderstorms, mainly after 3am. Low around 68. Calm wind. Chance of precipitation is 80%.
Wednesday
Showers and thunderstorms, mainly before 4pm. High near 81. Light and variable wind. Chance of precipitation is 80%.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 66. Calm wind.
Thursday
Mostly sunny, with a high near 84. Light northeast wind.
Thursday Night
Mostly clear, with a low around 63. Calm wind.
Friday
Sunny, with a high near 86.
Friday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 66.
Saturday
A slight chance of showers, with thunderstorms also possible after 1pm. Sunny, with a high near 86. Chance of precipitation is 20%.
Saturday Night
Mostly clear, with a low around 63.
Sunday
Mostly sunny, with a high near 82.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 64.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Tuesday
Mostly sunny, with a high near 87.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WSW Hardin IL
 39.14°N 90.69°W (Elev. 430 ft)
1:21 am CDT Aug 19, 2026
2am 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