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.

A Few Clouds

41°F

5°C

Humidity 73%
Wind Speed NE 15 mph
Barometer 30.43 in (1030.6 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 7 Apr 8:54 am CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • Today

    Today: Cloudy, then gradually becoming mostly sunny, with a high near 56. East wind 10 to 13 mph.

    High: 56 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, with a low around 39. East wind around 10 mph.

    Low: 39 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 73. South wind 10 to 17 mph, with gusts as high as 25 mph.

    High: 73 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 52. South wind 10 to 13 mph.

    Low: 52 °F

    Partly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers after 1pm. Sunny, with a high near 77. Southwest wind 8 to 11 mph.

    High: 77 °F

    Sunny then
    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Friday

    Friday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 71. Chance of precipitation is 60%.

    High: 71 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 52.

    Low: 52 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 75.

    High: 75 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Today
Cloudy, then gradually becoming mostly sunny, with a high near 56. East wind 10 to 13 mph.
Tonight
Mostly cloudy, with a low around 39. East wind around 10 mph.
Wednesday
Partly sunny, with a high near 73. South wind 10 to 17 mph, with gusts as high as 25 mph.
Wednesday Night
Partly cloudy, with a low around 52. South wind 10 to 13 mph.
Thursday
A 20 percent chance of showers after 1pm. Sunny, with a high near 77. Southwest wind 8 to 11 mph.
Thursday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 55.
Friday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 71. Chance of precipitation is 60%.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 52.
Saturday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 75.
Saturday Night
Mostly cloudy, with a low around 57.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81.
Sunday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61.
Monday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.
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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:
5:21 am CDT Apr 7, 2026
Forecast Valid:
9am CDT Apr 7, 2026-6pm CDT Apr 13, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation