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

55°F

13°C

Humidity 90%
Wind Speed Calm
Barometer 29.69 in (1005.0 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 22 Mar 1:54 am CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • Overnight

    Overnight: Mostly clear, with a low around 60. South wind around 9 mph.

    Low: 60 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 86. South wind 7 to 12 mph becoming north 13 to 18 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 86 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms between 8pm and 9pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 35. Breezy, with a north wind 18 to 23 mph decreasing to 11 to 16 mph after midnight. Winds could gust as high as 37 mph. Chance of precipitation is 20%.

    Low: 35 °F

    Slight Chance
    T-storms and
    Breezy then
    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 55. Northeast wind around 10 mph.

    High: 55 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 35. East wind around 6 mph.

    Low: 35 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 77.

    High: 77 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of rain and thunderstorms. Partly cloudy, with a low around 58.

    Low: 58 °F

    Slight Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 60. South wind around 9 mph.
Sunday
Increasing clouds, with a high near 86. South wind 7 to 12 mph becoming north 13 to 18 mph in the afternoon. Winds could gust as high as 25 mph.
Sunday Night
A slight chance of showers and thunderstorms between 8pm and 9pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 35. Breezy, with a north wind 18 to 23 mph decreasing to 11 to 16 mph after midnight. Winds could gust as high as 37 mph. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 55. Northeast wind around 10 mph.
Monday Night
Mostly cloudy, with a low around 35. East wind around 6 mph.
Tuesday
Mostly sunny, with a high near 66.
Tuesday Night
Mostly cloudy, with a low around 45.
Wednesday
Partly sunny, with a high near 77.
Wednesday Night
A 20 percent chance of rain and thunderstorms. Partly cloudy, with a low around 58.
Thursday
A 20 percent chance of rain and thunderstorms after 1pm. Sunny, with a high near 88.
Thursday Night
A 50 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 42.
Friday
A 40 percent chance of rain. Partly sunny, with a high near 55.
Friday Night
A 20 percent chance of rain. Partly cloudy, with a low around 31.
Saturday
Mostly sunny, with a high near 58.
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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:
1:26 am CDT Mar 22, 2026
Forecast Valid:
2am CDT Mar 22, 2026-6pm CDT Mar 28, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation