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.

Overcast

35°F

2°C

Humidity 64%
Wind Speed Calm
Barometer 30.19 in (1022.6 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Last update 2 Feb 11:54 am CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 37. Light and variable wind.

    High: 37 °F

    Partly Sunny

  • Tonight

    Tonight: A slight chance of freezing rain between 3am and 5am, then a slight chance of snow after 5am. Mostly cloudy, with a low around 24. Calm wind becoming northeast around 6 mph after midnight. Chance of precipitation is 20%.

    Low: 24 °F

    Mostly Cloudy
    then Slight
    Chance Wintry
    Mix

  • Tuesday

    Tuesday: A 30 percent chance of snow, mainly before 7am. Mostly cloudy, with a high near 34. North wind 6 to 10 mph.

    High: 34 °F

    Chance Snow
    then Partly
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 14. North wind around 6 mph becoming calm in the evening.

    Low: 14 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 30. Calm wind becoming northwest around 6 mph.

    High: 30 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 12.

    Low: 12 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 39.

    High: 39 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 28.

    Low: 28 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 45.

    High: 45 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 37. Light and variable wind.
Tonight
A slight chance of freezing rain between 3am and 5am, then a slight chance of snow after 5am. Mostly cloudy, with a low around 24. Calm wind becoming northeast around 6 mph after midnight. Chance of precipitation is 20%.
Tuesday
A 30 percent chance of snow, mainly before 7am. Mostly cloudy, with a high near 34. North wind 6 to 10 mph.
Tuesday Night
Mostly cloudy, with a low around 14. North wind around 6 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 30. Calm wind becoming northwest around 6 mph.
Wednesday Night
Partly cloudy, with a low around 12.
Thursday
Mostly sunny, with a high near 39.
Thursday Night
Mostly clear, with a low around 28.
Friday
Mostly sunny, with a high near 45.
Friday Night
Mostly clear, with a low around 18.
Saturday
Sunny, with a high near 37.
Saturday Night
Partly cloudy, with a low around 22.
Sunday
Mostly sunny, with a high near 44.
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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:
10:27 am CST Feb 2, 2026
Forecast Valid:
12pm CST Feb 2, 2026-6pm CST Feb 8, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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