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 9 mph
Barometer 29.91 in (1012.3 mb)
Dewpoint 71°F (22°C)
Visibility 8.00 mi
Last update 19 Aug 2:54 am CDT
Extended Forecast for

4 Miles WNW St. Charles County Smartt Airport MO

  • Overnight

    Overnight: Showers and thunderstorms.  Low around 70. South wind around 7 mph.  Chance of precipitation is 80%.

    Low: 70 °F

    T-storms

  • Wednesday

    Wednesday: Showers and thunderstorms likely, mainly before 10am.  Cloudy, with a high near 82. Light and variable wind.  Chance of precipitation is 70%.

    High: 82 °F

    T-storms
    Likely then
    Scattered
    Showers

  • Wednesday Night

    Wednesday Night: Scattered showers and thunderstorms, mainly before 10pm.  Mostly cloudy, with a low around 68. Light north wind.  Chance of precipitation is 30%.

    Low: 68 °F

    Scattered
    T-storms then
    Mostly 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 87.

    High: 87 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

  • 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 67.

    Low: 67 °F

    Mostly Clear

Detailed Forecast

Overnight
Showers and thunderstorms. Low around 70. South wind around 7 mph. Chance of precipitation is 80%.
Wednesday
Showers and thunderstorms likely, mainly before 10am. Cloudy, with a high near 82. Light and variable wind. Chance of precipitation is 70%.
Wednesday Night
Scattered showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 68. Light north wind. Chance of precipitation is 30%.
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 87.
Friday Night
Mostly clear, with a low around 68.
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 67.
Sunday
Mostly sunny, with a high near 83.
Sunday Night
A 20 percent chance of showers. Partly cloudy, with a low around 66.
Monday
Mostly sunny, with a high near 84.
Monday Night
Partly cloudy, with a low around 68.
Tuesday
Mostly sunny, with a high near 87.
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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)
3:26 am CDT Aug 19, 2026
3am CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
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Additional Resources

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