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

40°F

4°C

Humidity 83%
Wind Speed N 17 G 26 mph
Barometer 30.23 in (1023.3 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill31°F (-1°C)
Last update 27 Mar 5:54 am CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • Today

    Today: A 40 percent chance of showers, mainly before 8am. Cloudy, then gradually becoming mostly sunny, with a high near 53. North wind around 18 mph, with gusts as high as 28 mph.

    High: 53 °F

    Chance
    Showers then
    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 29. North wind 6 to 14 mph.

    Low: 29 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 56. Light and variable wind becoming south 5 to 10 mph in the morning.

    High: 56 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 38. South wind around 10 mph.

    Low: 38 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 70. South wind 8 to 13 mph.

    High: 70 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A 20 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 62.

    Low: 62 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A 30 percent chance of rain, mainly after 1pm. Partly sunny, with a high near 85.

    High: 85 °F

    Chance Rain

Detailed Forecast

Today
A 40 percent chance of showers, mainly before 8am. Cloudy, then gradually becoming mostly sunny, with a high near 53. North wind around 18 mph, with gusts as high as 28 mph.
Tonight
Mostly clear, with a low around 29. North wind 6 to 14 mph.
Saturday
Sunny, with a high near 56. Light and variable wind becoming south 5 to 10 mph in the morning.
Saturday Night
Partly cloudy, with a low around 38. South wind around 10 mph.
Sunday
Mostly cloudy, with a high near 70. South wind 8 to 13 mph.
Sunday Night
Partly cloudy, with a low around 54.
Monday
Mostly sunny, with a high near 84.
Monday Night
A 20 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 62.
Tuesday
A 30 percent chance of rain, mainly after 1pm. Partly sunny, with a high near 85.
Tuesday Night
A chance of rain, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 57. Chance of precipitation is 50%.
Wednesday
A 50 percent chance of rain and thunderstorms. Partly sunny, with a high near 72.
Wednesday Night
Rain and thunderstorms likely. Mostly cloudy, with a low around 49. Chance of precipitation is 70%.
Thursday
A 50 percent chance of rain and thunderstorms. Mostly cloudy, with a high near 65.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
St. Charles County Smartt Airport MO
 38.94°N 90.45°W (Elev. 427 ft)
Last Update:
5:41 am CDT Mar 27, 2026
Forecast Valid:
6am CDT Mar 27, 2026-6pm CDT Apr 2, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation