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.

Mostly Cloudy

17°F

-8°C

Humidity 62%
Wind Speed NE 6 mph
Barometer 30.29 in (1026.2 mb)
Dewpoint 6°F (-14°C)
Visibility 10.00 mi
Wind Chill8°F (-13°C)
Last update 29 Jan 6:54 am CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • Today

    Today: A 20 percent chance of snow after 4pm. Cloudy, with a high near 21. Northeast wind 6 to 8 mph.

    High: 21 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Tonight

    Tonight: A 50 percent chance of snow, mainly before 7pm. Mostly cloudy, with a low around 3. North wind 3 to 7 mph.

    Low: 3 °F

    Chance Snow
    then Mostly
    Cloudy

  • Friday

    Friday: Increasing clouds and cold, with a high near 16. North wind 6 to 11 mph.

    High: 16 °F

    Cold

  • Friday Night

    Friday Night: Partly cloudy, with a low around 0. Wind chill values as low as -15. North wind around 10 mph.

    Low: 0 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny and cold, with a high near 17. Northwest wind 7 to 11 mph.

    High: 17 °F

    Cold

  • Saturday Night

    Saturday Night: Mostly clear, with a low around -1.

    Low: -1 °F

    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of snow after noon. Partly sunny, with a high near 27.

    High: 27 °F

    Partly Sunny
    then Slight
    Chance Snow

  • Sunday Night

    Sunday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 16.

    Low: 16 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 32.

    High: 32 °F

    Partly Sunny

Detailed Forecast

Today
A 20 percent chance of snow after 4pm. Cloudy, with a high near 21. Northeast wind 6 to 8 mph.
Tonight
A 50 percent chance of snow, mainly before 7pm. Mostly cloudy, with a low around 3. North wind 3 to 7 mph.
Friday
Increasing clouds and cold, with a high near 16. North wind 6 to 11 mph.
Friday Night
Partly cloudy, with a low around 0. Wind chill values as low as -15. North wind around 10 mph.
Saturday
Sunny and cold, with a high near 17. Northwest wind 7 to 11 mph.
Saturday Night
Mostly clear, with a low around -1.
Sunday
A 20 percent chance of snow after noon. Partly sunny, with a high near 27.
Sunday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 16.
Monday
Partly sunny, with a high near 32.
Monday Night
Mostly cloudy, with a low around 16.
Tuesday
Mostly cloudy, with a high near 34.
Tuesday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 18.
Wednesday
A 30 percent chance of snow. Mostly cloudy, with a high near 34.
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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:
4:11 am CST Jan 29, 2026
Forecast Valid:
7am CST Jan 29, 2026-6pm CST Feb 4, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation