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

85°F

29°C

Humidity 48%
Wind Speed SW 17 G 24 mph
Barometer 29.92 in (1012.6 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 13 Apr 1:54 pm CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 86. South wind around 17 mph, with gusts as high as 25 mph.

    High: 86 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 68. Southwest wind 11 to 14 mph, with gusts as high as 24 mph.

    Low: 68 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms between 1pm and 2pm. Mostly sunny, with a high near 90. Southwest wind 10 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.

    High: 90 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Increasing clouds, with a low around 69. South wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.

    Low: 69 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Showers likely, then showers and possibly a thunderstorm after 10am. High near 82. Southwest wind 8 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.

    High: 82 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 62. Chance of precipitation is 90%.

    Low: 62 °F

    Showers

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 81.

    High: 81 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

This Afternoon
Partly sunny, with a high near 86. South wind around 17 mph, with gusts as high as 25 mph.
Tonight
Partly cloudy, with a low around 68. Southwest wind 11 to 14 mph, with gusts as high as 24 mph.
Tuesday
A slight chance of showers and thunderstorms between 1pm and 2pm. Mostly sunny, with a high near 90. Southwest wind 10 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.
Tuesday Night
A chance of showers and thunderstorms. Increasing clouds, with a low around 69. South wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.
Wednesday
Showers likely, then showers and possibly a thunderstorm after 10am. High near 82. Southwest wind 8 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.
Wednesday Night
Showers and possibly a thunderstorm. Low around 62. Chance of precipitation is 90%.
Thursday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 81.
Thursday Night
Mostly clear, with a low around 60.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89.
Friday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 60. Chance of precipitation is 70%.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 74.
Saturday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 42.
Sunday
Sunny, with a high near 64.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
St. Charles County Smartt Airport MO
 38.93°N 90.42°W (Elev. 427 ft)
Last Update:
1:26 pm CDT Apr 13, 2026
Forecast Valid:
2pm CDT Apr 13, 2026-6pm CDT Apr 19, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation