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

41°F

5°C

Humidity 51%
Wind Speed E 13 mph
Barometer 30.12 in (1020.2 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 8 Feb 1:54 pm CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 46. Southeast wind around 11 mph.

    High: 46 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 25. East wind 5 to 9 mph becoming calm after midnight.

    Low: 25 °F

    Partly Cloudy

  • Monday

    Monday: Patchy fog between 8am and 9am. Otherwise, mostly sunny, with a high near 53. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 53 °F

    Patchy Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 36. Southeast wind 6 to 8 mph becoming west after midnight.

    Low: 36 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 56. North wind 6 to 10 mph.

    High: 56 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 49.

    High: 49 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of rain after noon. Mostly cloudy, with a high near 45.

    High: 45 °F

    Mostly Cloudy
    then Chance
    Rain

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 46. Southeast wind around 11 mph.
Tonight
Partly cloudy, with a low around 25. East wind 5 to 9 mph becoming calm after midnight.
Monday
Patchy fog between 8am and 9am. Otherwise, mostly sunny, with a high near 53. Calm wind becoming south 5 to 7 mph in the afternoon.
Monday Night
Mostly clear, with a low around 36. Southeast wind 6 to 8 mph becoming west after midnight.
Tuesday
Mostly sunny, with a high near 56. North wind 6 to 10 mph.
Tuesday Night
Mostly cloudy, with a low around 29.
Wednesday
Mostly sunny, with a high near 49.
Wednesday Night
Mostly cloudy, with a low around 27.
Thursday
A 30 percent chance of rain after noon. Mostly cloudy, with a high near 45.
Thursday Night
A 40 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 28.
Friday
A 20 percent chance of rain. Partly sunny, with a high near 44.
Friday Night
A 30 percent chance of rain. Partly cloudy, with a low around 26.
Saturday
A 40 percent chance of rain. Partly sunny, with a high near 45.
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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:
12:26 pm CST Feb 8, 2026
Forecast Valid:
2pm CST Feb 8, 2026-6pm CST Feb 14, 2026
 
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Additional Resources

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Chance of Precipitation