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

74°F

23°C

Humidity 62%
Wind Speed E 8 mph
Barometer 30.10 in (1018.9 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 7 Sep 9:54 am CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • Labor Day

    Labor Day: Sunny, with a high near 88. East wind around 8 mph.

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 60. East wind 5 to 7 mph.

    Low: 60 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 95. East wind 5 to 8 mph becoming south in the morning.

    High: 95 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 71. South wind around 8 mph.

    Low: 71 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 96. South wind 8 to 10 mph becoming west in the afternoon. Chance of precipitation is 30%.

    High: 96 °F

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 66. Chance of precipitation is 90%.

    Low: 66 °F

    Showers

  • Thursday

    Thursday: A 40 percent chance of showers before 1pm. Partly sunny, with a high near 84.

    High: 84 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

Detailed Forecast

Labor Day
Sunny, with a high near 88. East wind around 8 mph.
Tonight
Mostly clear, with a low around 60. East wind 5 to 7 mph.
Tuesday
Mostly sunny, with a high near 95. East wind 5 to 8 mph becoming south in the morning.
Tuesday Night
Partly cloudy, with a low around 71. South wind around 8 mph.
Wednesday
A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 96. South wind 8 to 10 mph becoming west in the afternoon. Chance of precipitation is 30%.
Wednesday Night
Showers and possibly a thunderstorm. Low around 66. Chance of precipitation is 90%.
Thursday
A 40 percent chance of showers before 1pm. Partly sunny, with a high near 84.
Thursday Night
Mostly clear, with a low around 60.
Friday
Sunny, with a high near 87.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 65.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Saturday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 66.
Sunday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 91.
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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:
8:11 am CDT Sep 7, 2026
Forecast Valid:
10am CDT Sep 7, 2026-6pm CDT Sep 13, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation