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

60°F

16°C

Humidity 39%
Wind Speed NW 3 mph
Barometer 29.85 in (1010.8 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Last update 26 Feb 3:54 pm CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • Tonight

    Tonight: Clear, with a low around 34. Light southwest wind.

    Low: 34 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 70. Light southwest wind increasing to 9 to 14 mph in the morning.

    High: 70 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 38. Southwest wind 5 to 8 mph becoming north after midnight.

    Low: 38 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of rain after noon. Mostly sunny, with a high near 61. Northeast wind 5 to 10 mph becoming southeast in the afternoon.

    High: 61 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 27. North wind around 11 mph, with gusts as high as 20 mph.

    Low: 27 °F

    Partly Cloudy

  • Sunday

    Sunday: A chance of rain and snow after noon. Mostly cloudy, with a high near 42. Chance of precipitation is 40%.

    High: 42 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: Rain and snow. Low around 27. Chance of precipitation is 80%.

    Low: 27 °F

    Rain/Snow

  • Monday

    Monday: A slight chance of rain and snow before noon. Mostly cloudy, with a high near 41. Chance of precipitation is 20%.

    High: 41 °F

    Slight Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Monday Night

    Monday Night: A 40 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 30.

    Low: 30 °F

    Chance Rain

Detailed Forecast

Tonight
Clear, with a low around 34. Light southwest wind.
Friday
Sunny, with a high near 70. Light southwest wind increasing to 9 to 14 mph in the morning.
Friday Night
Mostly clear, with a low around 38. Southwest wind 5 to 8 mph becoming north after midnight.
Saturday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 61. Northeast wind 5 to 10 mph becoming southeast in the afternoon.
Saturday Night
Partly cloudy, with a low around 27. North wind around 11 mph, with gusts as high as 20 mph.
Sunday
A chance of rain and snow after noon. Mostly cloudy, with a high near 42. Chance of precipitation is 40%.
Sunday Night
Rain and snow. Low around 27. Chance of precipitation is 80%.
Monday
A slight chance of rain and snow before noon. Mostly cloudy, with a high near 41. Chance of precipitation is 20%.
Monday Night
A 40 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 30.
Tuesday
Rain likely, mainly before noon. Cloudy, with a high near 45. Chance of precipitation is 60%.
Tuesday Night
Rain likely. Cloudy, with a low around 35. Chance of precipitation is 60%.
Wednesday
Rain likely. Cloudy, with a high near 55. Chance of precipitation is 60%.
Wednesday Night
Rain likely. Cloudy, with a low around 45. Chance of precipitation is 70%.
Thursday
Rain likely. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
St. Charles County Smartt Airport MO
 38.93°N 90.42°W (Elev. 427 ft)
Last Update:
2:11 pm CST Feb 26, 2026
Forecast Valid:
4pm CST Feb 26, 2026-6pm CST Mar 5, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation