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.

Mostly Cloudy

50°F

10°C

Humidity 77%
Wind Speed Vrbl 6 mph
Barometer 30.00 in (1015.8 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 15 Feb 11:54 am CST
Extended Forecast for

4 Miles S St. Charles County Smartt Airport MO

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 57. North wind 5 to 9 mph becoming light and variable.

    High: 57 °F

    Mostly Sunny

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 35. Light and variable wind.

    Low: 35 °F

    Mostly Clear
    then Patchy
    Fog

  • Washington's Birthday

    Washington's Birthday: Patchy fog before 7am. Otherwise, partly sunny, with a high near 66. South wind 5 to 11 mph, with gusts as high as 20 mph.

    High: 66 °F

    Patchy Fog
    then Partly
    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 42. South wind 6 to 8 mph.

    Low: 42 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 65. South wind 6 to 16 mph, with gusts as high as 24 mph.

    High: 65 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 57.

    Low: 57 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 70.

    High: 70 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

  • Thursday

    Thursday: A 30 percent chance of showers after noon. Sunny, with a high near 71.

    High: 71 °F

    Sunny then
    Chance
    Showers

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 57. North wind 5 to 9 mph becoming light and variable.
Tonight
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 35. Light and variable wind.
Washington's Birthday
Patchy fog before 7am. Otherwise, partly sunny, with a high near 66. South wind 5 to 11 mph, with gusts as high as 20 mph.
Monday Night
Mostly cloudy, with a low around 42. South wind 6 to 8 mph.
Tuesday
Mostly cloudy, with a high near 65. South wind 6 to 16 mph, with gusts as high as 24 mph.
Tuesday Night
Mostly cloudy, with a low around 57.
Wednesday
Mostly sunny, with a high near 70.
Wednesday Night
Mostly clear, with a low around 43.
Thursday
A 30 percent chance of showers after noon. Sunny, with a high near 71.
Thursday Night
A 30 percent chance of showers before midnight. Mostly clear, with a low around 37.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 51.
Friday Night
Partly cloudy, with a low around 29.
Saturday
Mostly sunny, with a high near 50.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S St. Charles County Smartt Airport MO
 38.87°N 90.45°W (Elev. 436 ft)
Last Update:
10:46 am CST Feb 15, 2026
Forecast Valid:
12pm CST Feb 15, 2026-6pm CST Feb 21, 2026
 
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Additional Resources

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