National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Overcast

55°F

13°C

Humidity 96%
Wind Speed W 7 mph
Barometer 29.80 in (1008.8 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 9 May 7:54 am CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • Today

    Today: Mostly cloudy through mid morning, then gradual clearing, with a high near 81. West wind 7 to 14 mph, with gusts as high as 21 mph.

    High: 81 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Scattered showers and thunderstorms. Increasing clouds, with a low around 53. Southwest wind 6 to 9 mph becoming north after midnight. Chance of precipitation is 40%.

    Low: 53 °F

    Scattered
    Showers

  • Sunday

    Sunday: Partly sunny, with a high near 68. North wind around 10 mph.

    High: 68 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 44. North wind 5 to 7 mph becoming calm in the evening.

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 72. Calm wind becoming northwest 5 to 8 mph in the afternoon.

    High: 72 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 81.

    High: 81 °F

    Sunny then
    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 56.

    Low: 56 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy through mid morning, then gradual clearing, with a high near 81. West wind 7 to 14 mph, with gusts as high as 21 mph.
Tonight
Scattered showers and thunderstorms. Increasing clouds, with a low around 53. Southwest wind 6 to 9 mph becoming north after midnight. Chance of precipitation is 40%.
Sunday
Partly sunny, with a high near 68. North wind around 10 mph.
Sunday Night
Mostly clear, with a low around 44. North wind 5 to 7 mph becoming calm in the evening.
Monday
Sunny, with a high near 72. Calm wind becoming northwest 5 to 8 mph in the afternoon.
Monday Night
Mostly clear, with a low around 47.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 81.
Tuesday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 56.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Clear, with a low around 49.
Thursday
Sunny, with a high near 79.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 56.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 85.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
St. Charles County Smartt Airport MO
 38.94°N 90.45°W (Elev. 427 ft)
Last Update:
8:06 am CDT May 9, 2026
Forecast Valid:
8am CDT May 9, 2026-6pm CDT May 15, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation