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

29°F

-2°C

Humidity 66%
Wind Speed N 5 mph
Barometer 30.09 in (1019.3 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 21 Feb 1:54 am CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • Overnight

    Overnight: A chance of flurries after 5am. Mostly cloudy, with a low around 25. North wind around 6 mph.

    Low: 25 °F

    Chance
    Flurries

  • Saturday

    Saturday: A chance of flurries between 7am and 10am. Partly sunny, with a high near 41. Northwest wind 6 to 13 mph.

    High: 41 °F

    Chance
    Flurries

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 19. Northwest wind 10 to 15 mph, with gusts as high as 24 mph.

    Low: 19 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 33. Breezy, with a northwest wind 16 to 21 mph, with gusts as high as 32 mph.

    High: 33 °F

    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 13. Northwest wind 14 to 17 mph, with gusts as high as 25 mph.

    Low: 13 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 33.

    High: 33 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 17.

    Low: 17 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 53.

    High: 53 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A chance of flurries after 5am. Mostly cloudy, with a low around 25. North wind around 6 mph.
Saturday
A chance of flurries between 7am and 10am. Partly sunny, with a high near 41. Northwest wind 6 to 13 mph.
Saturday Night
Mostly clear, with a low around 19. Northwest wind 10 to 15 mph, with gusts as high as 24 mph.
Sunday
Sunny, with a high near 33. Breezy, with a northwest wind 16 to 21 mph, with gusts as high as 32 mph.
Sunday Night
Partly cloudy, with a low around 13. Northwest wind 14 to 17 mph, with gusts as high as 25 mph.
Monday
Sunny, with a high near 33.
Monday Night
Mostly clear, with a low around 17.
Tuesday
Partly sunny, with a high near 53.
Tuesday Night
Mostly cloudy, with a low around 36.
Wednesday
Partly sunny, with a high near 62.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 34.
Thursday
A 20 percent chance of rain. Mostly sunny, with a high near 52.
Thursday Night
Mostly clear, with a low around 29.
Friday
Sunny, with a high near 62.
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Forecast Area
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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:
12:26 am CST Feb 21, 2026
Forecast Valid:
2am CST Feb 21, 2026-6pm CST Feb 27, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation