National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

A Few Clouds

46°F

8°C

Humidity 51%
Wind Speed SE 7 mph
Barometer 30.28 in (1025.4 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 29 Mar 2:54 am CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • Overnight

    Overnight: Cloudy, with a low around 36. Southeast wind around 7 mph.

    Low: 36 °F

    Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 71. South wind 7 to 14 mph, with gusts as high as 21 mph.

    High: 71 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 53. South wind 9 to 11 mph.

    Low: 53 °F

    Mostly Cloudy

  • Monday

    Monday: Sunny, with a high near 85. Southwest wind 10 to 17 mph, with gusts as high as 26 mph.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 61. South wind around 15 mph, with gusts as high as 24 mph.

    Low: 61 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A chance of rain, with thunderstorms also possible after 10am. Partly sunny, with a high near 84. Breezy. Chance of precipitation is 50%.

    High: 84 °F

    Chance Rain
    then Chance
    T-storms and
    Breezy

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 45. Chance of precipitation is 90%.

    Low: 45 °F

    Rain

  • Wednesday

    Wednesday: Rain likely and possibly a thunderstorm before 1pm, then a chance of rain and thunderstorms after 1pm. Cloudy, with a high near 56. Chance of precipitation is 70%.

    High: 56 °F

    Rain Likely

  • Wednesday Night

    Wednesday Night: A chance of rain and thunderstorms, then rain likely and possibly a thunderstorm after 1am. Some of the storms could produce heavy rainfall. Cloudy, with a low around 42. Chance of precipitation is 70%.

    Low: 42 °F

    Heavy Rain

Detailed Forecast

Overnight
Cloudy, with a low around 36. Southeast wind around 7 mph.
Sunday
Partly sunny, with a high near 71. South wind 7 to 14 mph, with gusts as high as 21 mph.
Sunday Night
Mostly cloudy, with a low around 53. South wind 9 to 11 mph.
Monday
Sunny, with a high near 85. Southwest wind 10 to 17 mph, with gusts as high as 26 mph.
Monday Night
Partly cloudy, with a low around 61. South wind around 15 mph, with gusts as high as 24 mph.
Tuesday
A chance of rain, with thunderstorms also possible after 10am. Partly sunny, with a high near 84. Breezy. Chance of precipitation is 50%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 45. Chance of precipitation is 90%.
Wednesday
Rain likely and possibly a thunderstorm before 1pm, then a chance of rain and thunderstorms after 1pm. Cloudy, with a high near 56. Chance of precipitation is 70%.
Wednesday Night
A chance of rain and thunderstorms, then rain likely and possibly a thunderstorm after 1am. Some of the storms could produce heavy rainfall. Cloudy, with a low around 42. Chance of precipitation is 70%.
Thursday
Rain likely and possibly a thunderstorm. Cloudy, with a high near 61. Chance of precipitation is 70%.
Thursday Night
Rain likely. Mostly cloudy, with a low around 44. Chance of precipitation is 60%.
Friday
A 40 percent chance of rain. Partly sunny, with a high near 74.
Friday Night
Rain and thunderstorms likely. Mostly cloudy, with a low around 53. Chance of precipitation is 60%.
Saturday
Rain likely. Mostly cloudy, with a high near 69. Chance of precipitation is 60%.
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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 29, 2026
Forecast Valid:
3am CDT Mar 29, 2026-6pm CDT Apr 4, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation