National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Overcast

8°F

-13°C

Humidity 87%
Wind Speed Calm
Barometer 30.39 in (1029.6 mb)
Dewpoint 5°F (-15°C)
Visibility 10.00 mi
Last update 28 Jan 4:54 am CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • Today

    Today: Mostly cloudy, then gradually becoming sunny, with a high near 29. Light and variable wind becoming west 5 to 10 mph in the morning.

    High: 29 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Increasing clouds, with a low around 7. Calm wind becoming northeast around 5 mph after midnight.

    Low: 7 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Cloudy, with a high near 21. Northeast wind 5 to 7 mph.

    High: 21 °F

    Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 3. Northeast wind around 6 mph becoming calm.

    Low: 3 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny and cold, with a high near 17. North wind 6 to 10 mph.

    High: 17 °F

    Cold

  • Friday Night

    Friday Night: Partly cloudy, with a low around -2.

    Low: -2 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny and cold, with a high near 17.

    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. Mostly sunny, with a high near 26.

    High: 26 °F

    Mostly Sunny
    then Slight
    Chance Snow

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 29. Light and variable wind becoming west 5 to 10 mph in the morning.
Tonight
Increasing clouds, with a low around 7. Calm wind becoming northeast around 5 mph after midnight.
Thursday
Cloudy, with a high near 21. Northeast wind 5 to 7 mph.
Thursday Night
Mostly cloudy, with a low around 3. Northeast wind around 6 mph becoming calm.
Friday
Partly sunny and cold, with a high near 17. North wind 6 to 10 mph.
Friday Night
Partly cloudy, with a low around -2.
Saturday
Mostly sunny and cold, with a high near 17.
Saturday Night
Mostly clear, with a low around -1.
Sunday
A 20 percent chance of snow after noon. Mostly sunny, with a high near 26.
Sunday Night
Mostly cloudy, with a low around 13.
Monday
Partly sunny, with a high near 33.
Monday Night
Mostly cloudy, with a low around 16.
Tuesday
A 20 percent chance of rain. Mostly cloudy, 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:
5:36 am CST Jan 28, 2026
Forecast Valid:
5am CST Jan 28, 2026-6pm CST Feb 3, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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