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

42°F

6°C

Humidity 65%
Wind Speed N 15 mph
Barometer 30.24 in (1023.8 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 23 Mar 2:54 am CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • Overnight

    Overnight: Mostly clear, with a steady temperature around 40. North wind around 14 mph, with gusts as high as 23 mph.

    Low: 40 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 54. North wind around 11 mph.

    High: 54 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A chance of sprinkles after 2am. Mostly cloudy, with a low around 35. East wind 6 to 8 mph.

    Low: 35 °F

    Chance
    Sprinkles

  • Tuesday

    Tuesday: Mostly sunny, with a high near 62. Southeast wind 7 to 10 mph.

    High: 62 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 40. Southeast wind 5 to 7 mph.

    Low: 40 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 41. Chance of precipitation is 70%.

    Low: 41 °F

    Showers
    Likely

Detailed Forecast

Overnight
Mostly clear, with a steady temperature around 40. North wind around 14 mph, with gusts as high as 23 mph.
Monday
Mostly sunny, with a high near 54. North wind around 11 mph.
Monday Night
A chance of sprinkles after 2am. Mostly cloudy, with a low around 35. East wind 6 to 8 mph.
Tuesday
Mostly sunny, with a high near 62. Southeast wind 7 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 40. Southeast wind 5 to 7 mph.
Wednesday
Mostly sunny, with a high near 75.
Wednesday Night
Mostly clear, with a low around 57.
Thursday
Sunny, with a high near 88.
Thursday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 41. Chance of precipitation is 70%.
Friday
A 30 percent chance of showers before 1pm. Mostly cloudy, with a high near 53.
Friday Night
Partly cloudy, with a low around 30.
Saturday
Sunny, with a high near 57.
Saturday Night
Mostly clear, with a low around 36.
Sunday
Partly sunny, with a high near 65.
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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:
2:51 am CDT Mar 23, 2026
Forecast Valid:
3am CDT Mar 23, 2026-6pm CDT Mar 29, 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