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 and Breezy

45°F

7°C

Humidity 35%
Wind Speed W 22 G 29 mph
Barometer 30.06 in (1018.0 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 21 Jan 12:54 pm CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • This Afternoon

    This Afternoon: Sunny, with a high near 45. West wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 45 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 20. Southwest wind 5 to 13 mph becoming northwest in the evening. Winds could gust as high as 23 mph.

    Low: 20 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 38. West wind 3 to 6 mph.

    High: 38 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 5. Light and variable wind becoming north 11 to 16 mph in the evening. Winds could gust as high as 23 mph.

    Low: 5 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 11. North wind 13 to 16 mph, with gusts as high as 23 mph.

    High: 11 °F

    Cold

  • Friday Night

    Friday Night: Cloudy, with a low around -3.

    Low: -3 °F

    Cloudy

  • Saturday

    Saturday: A 50 percent chance of snow, mainly after noon. Cloudy and cold, with a high near 12.

    High: 12 °F

    Slight Chance
    Snow then
    Chance Snow

  • Saturday Night

    Saturday Night: A 50 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 5.

    Low: 5 °F

    Chance Snow
    then Slight
    Chance Snow

  • Sunday

    Sunday: A 20 percent chance of snow before noon. Partly sunny and cold, with a high near 19.

    High: 19 °F

    Slight Chance
    Snow then
    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 45. West wind 10 to 15 mph, with gusts as high as 25 mph.
Tonight
Partly cloudy, with a low around 20. Southwest wind 5 to 13 mph becoming northwest in the evening. Winds could gust as high as 23 mph.
Thursday
Partly sunny, with a high near 38. West wind 3 to 6 mph.
Thursday Night
Mostly cloudy, with a low around 5. Light and variable wind becoming north 11 to 16 mph in the evening. Winds could gust as high as 23 mph.
Friday
Mostly cloudy and cold, with a high near 11. North wind 13 to 16 mph, with gusts as high as 23 mph.
Friday Night
Cloudy, with a low around -3.
Saturday
A 50 percent chance of snow, mainly after noon. Cloudy and cold, with a high near 12.
Saturday Night
A 50 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 5.
Sunday
A 20 percent chance of snow before noon. Partly sunny and cold, with a high near 19.
Sunday Night
Partly cloudy, with a low around 2.
Monday
Sunny, with a high near 23.
Monday Night
Mostly clear, with a low around 8.
Tuesday
Mostly sunny, with a high near 35.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
St. Charles County Smartt Airport MO
 38.94°N 90.45°W (Elev. 427 ft)
Last Update:
10:57 am CST Jan 21, 2026
Forecast Valid:
1pm CST Jan 21, 2026-6pm CST Jan 27, 2026
 
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Additional Resources

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