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

43°F

6°C

Humidity 51%
Wind Speed N 5 mph
Barometer 29.69 in (1005.2 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill40°F (4°C)
Last update 25 Feb 3:54 am CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • Today

    Today: Mostly cloudy, with a high near 51. Calm wind becoming north around 5 mph in the afternoon.

    High: 51 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 50 percent chance of rain, mainly between 8pm and 5am. Mostly cloudy, with a low around 33. Northeast wind around 6 mph.

    Low: 33 °F

    Chance Rain

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 53. East wind around 6 mph becoming light and variable in the afternoon.

    High: 53 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 31. Calm wind becoming southwest around 5 mph after midnight.

    Low: 31 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 68. Southwest wind 5 to 14 mph.

    High: 68 °F

    Sunny

  • Friday Night

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

    Low: 37 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 60.

    High: 60 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain. Partly cloudy, with a low around 28.

    Low: 28 °F

    Slight Chance
    Rain

  • Sunday

    Sunday: A chance of rain before noon, then a chance of rain and snow. Mostly cloudy, with a high near 43. Chance of precipitation is 50%.

    High: 43 °F

    Chance Rain
    then Chance
    Rain/Snow

Detailed Forecast

Today
Mostly cloudy, with a high near 51. Calm wind becoming north around 5 mph in the afternoon.
Tonight
A 50 percent chance of rain, mainly between 8pm and 5am. Mostly cloudy, with a low around 33. Northeast wind around 6 mph.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 53. East wind around 6 mph becoming light and variable in the afternoon.
Thursday Night
Mostly clear, with a low around 31. Calm wind becoming southwest around 5 mph after midnight.
Friday
Sunny, with a high near 68. Southwest wind 5 to 14 mph.
Friday Night
Mostly clear, with a low around 37.
Saturday
Mostly sunny, with a high near 60.
Saturday Night
A 20 percent chance of rain. Partly cloudy, with a low around 28.
Sunday
A chance of rain before noon, then a chance of rain and snow. Mostly cloudy, with a high near 43. Chance of precipitation is 50%.
Sunday Night
Rain and snow likely, mainly before midnight. Some thunder is also possible. Mostly cloudy, with a low around 27. Chance of precipitation is 60%.
Monday
A 30 percent chance of rain. Mostly cloudy, with a high near 42.
Monday Night
A 40 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 27.
Tuesday
A 50 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:
1:51 am CST Feb 25, 2026
Forecast Valid:
4am CST Feb 25, 2026-6pm CST Mar 3, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation