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

55°F

13°C

Humidity 93%
Wind Speed SE 5 mph
Barometer 30.01 in (1015.9 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Wind Chill54°F (12°C)
Last update 5 Mar 7:54 pm CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • Tonight

    Tonight: A 40 percent chance of rain and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 51. Calm wind becoming southeast 5 to 8 mph after midnight.

    Low: 51 °F

    Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of rain and thunderstorms, mainly before 3pm. Partly sunny, with a high near 75. South wind 9 to 17 mph, with gusts as high as 26 mph.

    High: 75 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of rain before 9pm, then a slight chance of rain and thunderstorms between 9pm and midnight, then rain and possibly a thunderstorm after midnight. Low around 55. Southwest wind 13 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.

    Low: 55 °F

    Slight Chance
    T-storms then
    Rain

  • Saturday

    Saturday: A chance of rain and thunderstorms before 9am, then a chance of rain between 9am and noon. Cloudy, then gradually becoming mostly sunny, with a high near 66. Southwest wind 10 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 40%.

    High: 66 °F

    Chance Rain
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 36. Northwest wind 5 to 9 mph becoming calm after midnight.

    Low: 36 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 68.

    High: 68 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 46.

    Low: 46 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Monday Night

    Monday Night: A slight chance of rain, then a chance of rain and thunderstorms after midnight. Partly cloudy, with a low around 56. Chance of precipitation is 30%.

    Low: 56 °F

    Chance Rain

Detailed Forecast

Tonight
A 40 percent chance of rain and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 51. Calm wind becoming southeast 5 to 8 mph after midnight.
Friday
A 30 percent chance of rain and thunderstorms, mainly before 3pm. Partly sunny, with a high near 75. South wind 9 to 17 mph, with gusts as high as 26 mph.
Friday Night
A slight chance of rain before 9pm, then a slight chance of rain and thunderstorms between 9pm and midnight, then rain and possibly a thunderstorm after midnight. Low around 55. Southwest wind 13 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.
Saturday
A chance of rain and thunderstorms before 9am, then a chance of rain between 9am and noon. Cloudy, then gradually becoming mostly sunny, with a high near 66. Southwest wind 10 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 40%.
Saturday Night
Partly cloudy, with a low around 36. Northwest wind 5 to 9 mph becoming calm after midnight.
Sunday
Sunny, with a high near 68.
Sunday Night
Clear, with a low around 46.
Monday
Sunny, with a high near 78.
Monday Night
A slight chance of rain, then a chance of rain and thunderstorms after midnight. Partly cloudy, with a low around 56. Chance of precipitation is 30%.
Tuesday
Rain and possibly a thunderstorm. High near 78. Chance of precipitation is 80%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 49. Chance of precipitation is 90%.
Wednesday
Rain likely. Mostly cloudy, with a high near 62. Chance of precipitation is 70%.
Wednesday Night
A 20 percent chance of rain. Partly cloudy, with a low around 32.
Thursday
Sunny, with a high near 55.
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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:
5:10 pm CST Mar 5, 2026
Forecast Valid:
8pm CST Mar 5, 2026-6pm CDT Mar 12, 2026
 
Forecast Discussion
 
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Additional Resources

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