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.

Fog/Mist

58°F

14°C

Humidity 97%
Wind Speed E 3 mph
Barometer 30.16 in (1020.9 mb)
Dewpoint 57°F (14°C)
Visibility 2.00 mi
Last update 4 Oct 6:54 am CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • Today

    Today: Sunny, with a high near 89. Light southeast wind becoming south 6 to 11 mph in the morning.

    High: 89 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 58. Southeast wind around 7 mph.

    Low: 58 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 87. South wind 6 to 14 mph, with gusts as high as 21 mph.

    High: 87 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 61. South wind 6 to 9 mph.

    Low: 61 °F

    Mostly Clear

  • Monday

    Monday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Sunny, with a high near 87. South wind 3 to 8 mph. Chance of precipitation is 30%.

    High: 87 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 61.

    Low: 61 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 78.

    High: 78 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 50.

    Low: 50 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 89. Light southeast wind becoming south 6 to 11 mph in the morning.
Tonight
Clear, with a low around 58. Southeast wind around 7 mph.
Sunday
Sunny, with a high near 87. South wind 6 to 14 mph, with gusts as high as 21 mph.
Sunday Night
Mostly clear, with a low around 61. South wind 6 to 9 mph.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Sunny, with a high near 87. South wind 3 to 8 mph. Chance of precipitation is 30%.
Monday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 61.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 78.
Tuesday Night
Mostly cloudy, with a low around 50.
Wednesday
Sunny, with a high near 73.
Wednesday Night
Mostly clear, with a low around 48.
Thursday
Sunny, with a high near 74.
Thursday Night
Mostly clear, with a low around 50.
Friday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 77.
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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:
4:16 am CDT Oct 4, 2025
Forecast Valid:
7am CDT Oct 4, 2025-6pm CDT Oct 10, 2025
 
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