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

37°F

3°C

Humidity 93%
Wind Speed Calm
Barometer 30.06 in (1017.8 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Last update 8 Mar 2:54 am CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • Overnight

    Overnight: Mostly clear, with a low around 34. Light southwest wind.

    Low: 34 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 66. Southwest wind 5 to 13 mph.

    High: 66 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 43. Southwest wind around 9 mph.

    Low: 43 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 77. South wind 7 to 15 mph, with gusts as high as 23 mph.

    High: 77 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 56. Southwest wind around 10 mph.

    Low: 56 °F

    Mostly Clear

  • Tuesday

    Tuesday: Rain likely, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 81. Chance of precipitation is 70%.

    High: 81 °F

    Slight Chance
    Rain then
    Rain Likely

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 51. Chance of precipitation is 100%.

    Low: 51 °F

    Rain

  • Wednesday

    Wednesday: Rain and possibly a thunderstorm before 1pm, then a chance of rain. High near 62. Breezy. Chance of precipitation is 100%.

    High: 62 °F

    Rain and
    Breezy

  • Wednesday Night

    Wednesday Night: A slight chance of rain and snow before 1am. Partly cloudy, with a low around 29. Chance of precipitation is 20%.

    Low: 29 °F

    Slight Chance
    Rain/Snow

Detailed Forecast

Overnight
Mostly clear, with a low around 34. Light southwest wind.
Sunday
Sunny, with a high near 66. Southwest wind 5 to 13 mph.
Sunday Night
Clear, with a low around 43. Southwest wind around 9 mph.
Monday
Sunny, with a high near 77. South wind 7 to 15 mph, with gusts as high as 23 mph.
Monday Night
Mostly clear, with a low around 56. Southwest wind around 10 mph.
Tuesday
Rain likely, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 81. Chance of precipitation is 70%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 51. Chance of precipitation is 100%.
Wednesday
Rain and possibly a thunderstorm before 1pm, then a chance of rain. High near 62. Breezy. Chance of precipitation is 100%.
Wednesday Night
A slight chance of rain and snow before 1am. Partly cloudy, with a low around 29. Chance of precipitation is 20%.
Thursday
Sunny, with a high near 55.
Thursday Night
Mostly cloudy, with a low around 41.
Friday
Mostly sunny, with a high near 66.
Friday Night
Mostly cloudy, with a low around 36.
Saturday
Mostly cloudy, with a high near 55.
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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:
3:21 am CDT Mar 8, 2026
Forecast Valid:
3am CDT Mar 8, 2026-6pm CDT Mar 14, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation