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.

Overcast

52°F

11°C

Humidity 97%
Wind Speed Calm
Barometer 29.98 in (1015.3 mb)
Dewpoint 51°F (11°C)
Visibility 8.00 mi
Last update 4 Mar 8:54 pm CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • Tonight

    Tonight: Showers and thunderstorms, mainly before 4am, then showers likely and possibly a thunderstorm after 4am. Patchy fog. Low around 48. Light and variable wind. Chance of precipitation is 80%.

    Low: 48 °F

    T-storms and
    Patchy Fog

  • Thursday

    Thursday: Scattered showers, mainly before 7am. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 67. Light and variable wind becoming west 5 to 8 mph. Chance of precipitation is 40%.

    High: 67 °F

    Scattered
    Showers and
    Patchy Fog
    then Partly
    Sunny

  • Thursday Night

    Thursday Night: A chance of showers before midnight, then showers likely and possibly a thunderstorm between midnight and 3am, then a slight chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 52. Calm wind becoming southeast 5 to 9 mph in the evening. Chance of precipitation is 60%.

    Low: 52 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday

    Friday: Scattered showers, mainly before noon. Partly sunny, with a high near 78. South wind 10 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 30%.

    High: 78 °F

    Scattered
    Showers

  • Friday Night

    Friday Night: Scattered showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Low around 52. South wind around 14 mph, with gusts as high as 22 mph. Chance of precipitation is 90%.

    Low: 52 °F

    Scattered
    T-storms then
    Showers

  • Saturday

    Saturday: Scattered showers before noon. Mostly cloudy, with a high near 64. Chance of precipitation is 40%.

    High: 64 °F

    Scattered
    Showers then
    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

Detailed Forecast

Tonight
Showers and thunderstorms, mainly before 4am, then showers likely and possibly a thunderstorm after 4am. Patchy fog. Low around 48. Light and variable wind. Chance of precipitation is 80%.
Thursday
Scattered showers, mainly before 7am. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 67. Light and variable wind becoming west 5 to 8 mph. Chance of precipitation is 40%.
Thursday Night
A chance of showers before midnight, then showers likely and possibly a thunderstorm between midnight and 3am, then a slight chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 52. Calm wind becoming southeast 5 to 9 mph in the evening. Chance of precipitation is 60%.
Friday
Scattered showers, mainly before noon. Partly sunny, with a high near 78. South wind 10 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 30%.
Friday Night
Scattered showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Low around 52. South wind around 14 mph, with gusts as high as 22 mph. Chance of precipitation is 90%.
Saturday
Scattered showers before noon. Mostly cloudy, with a high near 64. Chance of precipitation is 40%.
Saturday Night
Partly cloudy, with a low around 38.
Sunday
Sunny, with a high near 65.
Sunday Night
Mostly clear, with a low around 45.
Monday
Sunny, with a high near 76.
Monday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 56.
Tuesday
Showers and possibly a thunderstorm. High near 75. Chance of precipitation is 80%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 43. Chance of precipitation is 90%.
Wednesday
Showers likely. Mostly cloudy, with a high near 56. 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:
8:47 pm CST Mar 4, 2026
Forecast Valid:
9pm CST Mar 4, 2026-6pm CDT Mar 11, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation