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

71°F

22°C

Humidity 96%
Wind Speed Calm
Barometer 29.95 in (1013.7 mb)
Dewpoint 70°F (21°C)
Visibility 8.00 mi
Last update 19 Aug 12:54 am CDT
Extended Forecast for

4 Miles WNW St. Charles County Smartt Airport MO

  • Overnight

    Overnight: Showers and thunderstorms, mainly after 3am.  Low around 70. Light west wind.  Chance of precipitation is 80%.

    Low: 70 °F

    T-storms

  • Wednesday

    Wednesday: Showers and thunderstorms, mainly before noon.  High near 82. Light and variable wind.  Chance of precipitation is 80%.

    High: 82 °F

    T-storms then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms before 10pm.  Partly cloudy, with a low around 68. Light north wind.

    Low: 68 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Thursday

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

    High: 84 °F

    Mostly Sunny

  • Thursday Night

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

    Low: 66 °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.  Mostly clear, with a low around 68.

    Low: 68 °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 65.

    Low: 65 °F

    Mostly Clear

Detailed Forecast

Overnight
Showers and thunderstorms, mainly after 3am. Low around 70. Light west wind. Chance of precipitation is 80%.
Wednesday
Showers and thunderstorms, mainly before noon. High near 82. Light and variable wind. Chance of precipitation is 80%.
Wednesday Night
A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 68. Light north wind.
Thursday
Mostly sunny, with a high near 84. Calm wind becoming northeast around 5 mph in the morning.
Thursday Night
Mostly clear, with a low around 66. Light east wind.
Friday
Sunny, with a high near 86.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 68.
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 65.
Sunday
Mostly sunny, with a high near 83.
Sunday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Monday
A 20 percent chance of showers. Mostly sunny, with a high near 86.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Tuesday
Mostly sunny, with a high near 88.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW St. Charles County Smartt Airport MO
 38.96°N 90.5°W (Elev. 417 ft)
1:21 am CDT Aug 19, 2026
1am CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
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Additional Resources

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