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

28°F

-2°C

Humidity 66%
Wind Speed S 6 mph
Barometer 30.48 in (1032.7 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 11 Jan 6:54 pm CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • Tonight

    Tonight: Clear, with a low around 25. South wind around 6 mph.

    Low: 25 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 52. West wind 6 to 10 mph.

    High: 52 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 33. Southwest wind 6 to 9 mph.

    Low: 33 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 59. Southwest wind 10 to 15 mph, with gusts as high as 24 mph.

    High: 59 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 35. West wind 9 to 13 mph, with gusts as high as 20 mph.

    Low: 35 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 41. Breezy.

    High: 41 °F

    Mostly Cloudy
    and Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 16.

    Low: 16 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 22.

    Low: 22 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 25. South wind around 6 mph.
Monday
Sunny, with a high near 52. West wind 6 to 10 mph.
Monday Night
Mostly clear, with a low around 33. Southwest wind 6 to 9 mph.
Tuesday
Increasing clouds, with a high near 59. Southwest wind 10 to 15 mph, with gusts as high as 24 mph.
Tuesday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 35. West wind 9 to 13 mph, with gusts as high as 20 mph.
Wednesday
Mostly cloudy, with a high near 41. Breezy.
Wednesday Night
Partly cloudy, with a low around 16.
Thursday
Mostly sunny, with a high near 33.
Thursday Night
Mostly cloudy, with a low around 22.
Friday
Partly sunny, with a high near 41.
Friday Night
Mostly cloudy, with a low around 20.
Saturday
Mostly cloudy, with a high near 31.
Saturday Night
Partly cloudy, with a low around 13.
Sunday
Mostly sunny, with a high near 33.
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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:
4:36 pm CST Jan 11, 2026
Forecast Valid:
7pm CST Jan 11, 2026-6pm CST Jan 18, 2026
 
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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