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.

Light Rain

73°F

23°C

Humidity 94%
Wind Speed S 7 mph
Barometer 29.95 in (1013.5 mb)
Dewpoint 71°F (22°C)
Visibility 7.00 mi
Last update 19 Aug 4:54 am CDT
Extended Forecast for

3 Miles SE Hardin IL

  • Overnight

    Overnight: Scattered showers and thunderstorms.  Cloudy, with a low around 70. Calm wind.  Chance of precipitation is 30%.

    Low: 70 °F

    Scattered
    Showers

  • Wednesday

    Wednesday: Showers and thunderstorms likely, mainly before 8am.  Cloudy, with a high near 81. Light and variable wind.  Chance of precipitation is 60%.

    High: 81 °F

    Showers
    Likely then
    Scattered
    Showers

  • Wednesday Night

    Wednesday Night: Scattered showers and thunderstorms, mainly before 10pm.  Mostly cloudy, with a low around 66. Light northeast wind.  Chance of precipitation is 30%.

    Low: 66 °F

    Scattered
    T-storms then
    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 84. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 84 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Friday Night

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

    Low: 66 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms before 1pm.  Mostly sunny, with a high near 86.

    High: 86 °F

    Slight Chance
    T-storms

  • Saturday Night

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

    Low: 65 °F

    Mostly Clear

Detailed Forecast

Overnight
Scattered showers and thunderstorms. Cloudy, with a low around 70. Calm wind. Chance of precipitation is 30%.
Wednesday
Showers and thunderstorms likely, mainly before 8am. Cloudy, with a high near 81. Light and variable wind. Chance of precipitation is 60%.
Wednesday Night
Scattered showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 66. Light northeast wind. Chance of precipitation is 30%.
Thursday
Mostly sunny, with a high near 84. Calm wind becoming northeast around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 64. Calm wind.
Friday
Sunny, with a high near 87.
Friday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 66.
Saturday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 86.
Saturday Night
Mostly clear, with a low around 65.
Sunday
Mostly sunny, with a high near 83.
Sunday Night
A 20 percent chance of showers. Partly cloudy, with a low around 64.
Monday
Partly sunny, with a high near 84.
Monday Night
Partly cloudy, with a low around 66.
Tuesday
Mostly sunny, with a high near 87.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE Hardin IL
 39.12°N 90.58°W (Elev. 430 ft)
5:21 am CDT Aug 19, 2026
5am 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