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.

Overcast

33°F

1°C

Humidity 43%
Wind Speed SE 7 mph
Barometer 30.16 in (1021.9 mb)
Dewpoint 13°F (-11°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 17 Mar 7:54 pm CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • Tonight

    Tonight: A 30 percent chance of snow, mainly before 11pm. Cloudy, with a low around 29. Southeast wind 8 to 13 mph, with gusts as high as 26 mph.

    Low: 29 °F

    Chance Snow

  • Wednesday

    Wednesday: Partly sunny, then gradually becoming sunny, with a high near 62. Southeast wind 7 to 9 mph becoming west in the afternoon.

    High: 62 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 42. Light and variable wind becoming south around 5 mph after midnight.

    Low: 42 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 72. South wind 5 to 8 mph becoming northwest in the afternoon.

    High: 72 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 41. North wind around 6 mph becoming calm after midnight.

    Low: 41 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 48.

    Low: 48 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 83.

    High: 83 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear

Detailed Forecast

Tonight
A 30 percent chance of snow, mainly before 11pm. Cloudy, with a low around 29. Southeast wind 8 to 13 mph, with gusts as high as 26 mph.
Wednesday
Partly sunny, then gradually becoming sunny, with a high near 62. Southeast wind 7 to 9 mph becoming west in the afternoon.
Wednesday Night
Mostly cloudy, with a low around 42. Light and variable wind becoming south around 5 mph after midnight.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 72. South wind 5 to 8 mph becoming northwest in the afternoon.
Thursday Night
Mostly clear, with a low around 41. North wind around 6 mph becoming calm after midnight.
Friday
Mostly sunny, with a high near 75.
Friday Night
Partly cloudy, with a low around 48.
Saturday
Sunny, with a high near 83.
Saturday Night
Mostly clear, with a low around 52.
Sunday
Mostly sunny, with a high near 79.
Sunday Night
Partly cloudy, with a low around 36.
Monday
Mostly sunny, with a high near 55.
Monday Night
Mostly cloudy, with a low around 34.
Tuesday
Mostly sunny, with a high near 59.
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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:
6:01 pm CDT Mar 17, 2026
Forecast Valid:
8pm CDT Mar 17, 2026-6pm CDT Mar 24, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation