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

52°F

11°C

Humidity 50%
Wind Speed E 7 mph
Barometer 30.02 in (1016.9 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 9 Feb 3:54 pm CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • Tonight

    Tonight: Mostly clear, with a low around 41. Southeast wind around 8 mph becoming southwest after midnight.

    Low: 41 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 57. West wind 7 to 13 mph becoming north in the morning. Winds could gust as high as 20 mph.

    High: 57 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 27. North wind 6 to 8 mph.

    Low: 27 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 49. North wind 3 to 6 mph.

    High: 49 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 28. Calm wind.

    Low: 28 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of rain after noon. Mostly cloudy, with a high near 45.

    High: 45 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Thursday Night

    Thursday Night: A 20 percent chance of rain. Mostly cloudy, with a low around 30.

    Low: 30 °F

    Slight Chance
    Rain

  • Friday

    Friday: Partly sunny, with a high near 47.

    High: 47 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 32.

    Low: 32 °F

    Chance Rain

Detailed Forecast

Tonight
Mostly clear, with a low around 41. Southeast wind around 8 mph becoming southwest after midnight.
Tuesday
Sunny, with a high near 57. West wind 7 to 13 mph becoming north in the morning. Winds could gust as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 27. North wind 6 to 8 mph.
Wednesday
Mostly sunny, with a high near 49. North wind 3 to 6 mph.
Wednesday Night
Mostly cloudy, with a low around 28. Calm wind.
Thursday
A 20 percent chance of rain after noon. Mostly cloudy, with a high near 45.
Thursday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 30.
Friday
Partly sunny, with a high near 47.
Friday Night
A 30 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 32.
Saturday
Rain likely, mainly after noon. Cloudy, with a high near 46. Chance of precipitation is 70%.
Saturday Night
Rain. Low around 32. Chance of precipitation is 80%.
Sunday
A 40 percent chance of rain. Mostly sunny, with a high near 51.
Sunday Night
Mostly clear, with a low around 30.
Washington's Birthday
Mostly sunny, with a high near 56.
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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:
1:41 pm CST Feb 9, 2026
Forecast Valid:
4pm CST Feb 9, 2026-6pm CST Feb 16, 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