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

22°F

-6°C

Humidity 55%
Wind Speed Calm
Barometer 30.41 in (1030.4 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Last update 23 Feb 7:54 pm CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • Tonight

    Tonight: Mostly clear, with a low around 17. Light and variable wind becoming southeast 5 to 7 mph after midnight.

    Low: 17 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 55. Breezy, with a southeast wind 8 to 13 mph becoming south 15 to 20 mph in the afternoon. Winds could gust as high as 36 mph.

    High: 55 °F

    Partly Sunny
    then Mostly
    Cloudy and
    Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 31. Southwest wind 6 to 11 mph becoming light and variable after midnight.

    Low: 31 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 52. Light and variable wind becoming north around 6 mph in the morning.

    High: 52 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Rain likely, mainly after midnight. Mostly cloudy, with a low around 32. East wind 6 to 8 mph. Chance of precipitation is 60%.

    Low: 32 °F

    Chance Rain
    then Rain
    Likely

  • Thursday

    Thursday: A 20 percent chance of rain before noon. Partly sunny, with a high near 50.

    High: 50 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 64.

    High: 64 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 17. Light and variable wind becoming southeast 5 to 7 mph after midnight.
Tuesday
Partly sunny, with a high near 55. Breezy, with a southeast wind 8 to 13 mph becoming south 15 to 20 mph in the afternoon. Winds could gust as high as 36 mph.
Tuesday Night
Mostly cloudy, with a low around 31. Southwest wind 6 to 11 mph becoming light and variable after midnight.
Wednesday
Mostly sunny, with a high near 52. Light and variable wind becoming north around 6 mph in the morning.
Wednesday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 32. East wind 6 to 8 mph. Chance of precipitation is 60%.
Thursday
A 20 percent chance of rain before noon. Partly sunny, with a high near 50.
Thursday Night
Mostly clear, with a low around 30.
Friday
Sunny, with a high near 64.
Friday Night
Mostly clear, with a low around 37.
Saturday
Sunny, with a high near 64.
Saturday Night
Mostly cloudy, with a low around 30.
Sunday
A chance of rain and snow. Mostly cloudy, with a high near 47. Chance of precipitation is 30%.
Sunday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 28.
Monday
A 30 percent chance of rain. Mostly cloudy, with a high near 46.
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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:
7:56 pm CST Feb 23, 2026
Forecast Valid:
8pm CST Feb 23, 2026-6pm CST Mar 2, 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