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

23°F

-5°C

Humidity 78%
Wind Speed Calm
Barometer 30.40 in (1029.7 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Last update 12 Jan 12:54 am CST
Extended Forecast for

3 Miles SSE St. Charles County Smartt Airport MO

  • Overnight

    Overnight: Clear, with a low around 24. South wind around 6 mph.

    Low: 24 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 51. Southwest wind 6 to 10 mph, with gusts as high as 22 mph.

    High: 51 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 35. Southwest wind 5 to 7 mph.

    Low: 35 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 59. West wind 8 to 16 mph, with gusts as high as 25 mph.

    High: 59 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 37. West wind 8 to 13 mph.

    Low: 37 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 43. Breezy.

    High: 43 °F

    Mostly Cloudy
    and Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 17. Blustery.

    Low: 17 °F

    Mostly Cloudy
    and Blustery
    then Partly
    Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Clear, with a low around 24. South wind around 6 mph.
Monday
Sunny, with a high near 51. Southwest wind 6 to 10 mph, with gusts as high as 22 mph.
Monday Night
Mostly clear, with a low around 35. Southwest wind 5 to 7 mph.
Tuesday
Increasing clouds, with a high near 59. West wind 8 to 16 mph, with gusts as high as 25 mph.
Tuesday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 37. West wind 8 to 13 mph.
Wednesday
Mostly cloudy, with a high near 43. Breezy.
Wednesday Night
Partly cloudy, with a low around 17. Blustery.
Thursday
Mostly sunny, with a high near 34.
Thursday Night
Mostly cloudy, with a low around 27.
Friday
Partly sunny, with a high near 43.
Friday Night
Mostly cloudy, with a low around 22.
Saturday
Mostly cloudy, with a high near 32.
Saturday Night
Partly cloudy, with a low around 13.
Sunday
Mostly sunny, with a high near 33.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE St. Charles County Smartt Airport MO
 38.89°N 90.39°W (Elev. 427 ft)
Last Update:
12:31 am CST Jan 12, 2026
Forecast Valid:
1am CST Jan 12, 2026-6pm CST Jan 18, 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