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

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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair and Breezy

31°F

-1°C

Humidity 40%
Wind Speed W 23 G 31 mph
Barometer 30.46 in (1032.0 mb)
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Wind Chill18°F (-8°C)
Last update 22 Feb 1:54 pm CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • This Afternoon

    This Afternoon: Sunny, with a high near 31. Blustery, with a northwest wind 18 to 20 mph, with gusts as high as 30 mph.

    High: 31 °F

    Sunny and
    Blustery

  • Tonight

    Tonight: Increasing clouds, with a low around 12. Northwest wind 14 to 16 mph, with gusts as high as 29 mph.

    Low: 12 °F

    Increasing
    Clouds

  • Monday

    Monday: Sunny, with a high near 33. Northwest wind 7 to 15 mph, with gusts as high as 23 mph.

    High: 33 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 18. Calm wind becoming south 5 to 9 mph after midnight.

    Low: 18 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 54. South wind 10 to 17 mph, with gusts as high as 25 mph.

    High: 54 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 30.

    Low: 30 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 54.

    High: 54 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Rain likely, mainly after midnight. Mostly cloudy, with a low around 33. Chance of precipitation is 60%.

    Low: 33 °F

    Rain Likely

  • Thursday

    Thursday: A 20 percent chance of rain before noon. Mostly sunny, with a high near 53.

    High: 53 °F

    Slight Chance
    Rain then
    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 31. Blustery, with a northwest wind 18 to 20 mph, with gusts as high as 30 mph.
Tonight
Increasing clouds, with a low around 12. Northwest wind 14 to 16 mph, with gusts as high as 29 mph.
Monday
Sunny, with a high near 33. Northwest wind 7 to 15 mph, with gusts as high as 23 mph.
Monday Night
Increasing clouds, with a low around 18. Calm wind becoming south 5 to 9 mph after midnight.
Tuesday
Mostly cloudy, with a high near 54. South wind 10 to 17 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 30.
Wednesday
Mostly sunny, with a high near 54.
Wednesday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 33. Chance of precipitation is 60%.
Thursday
A 20 percent chance of rain before noon. Mostly sunny, with a high near 53.
Thursday Night
Mostly clear, with a low around 28.
Friday
Sunny, with a high near 64.
Friday Night
Mostly clear, with a low around 35.
Saturday
Sunny, with a high near 60.
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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:
12:26 pm CST Feb 22, 2026
Forecast Valid:
1pm CST Feb 22, 2026-6pm CST Feb 28, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation