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

33°F

1°C

Humidity 54%
Wind Speed SW 5 mph
Barometer 30.50 in (1033.2 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 11 Jan 5:54 pm CST
Extended Forecast for

2 Miles SSW Portage Des Sioux MO

  • Tonight

    Tonight: Clear, with a low around 26. Southwest wind 5 to 7 mph.

    Low: 26 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 51. Southwest wind 6 to 10 mph.

    High: 51 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 36. Southwest wind 5 to 8 mph.

    Low: 36 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 59. Southwest wind 9 to 16 mph, with gusts as high as 24 mph.

    High: 59 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 37. West wind 8 to 13 mph.

    Low: 37 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 43. Breezy.

    High: 43 °F

    Mostly Cloudy
    and Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 18. Blustery.

    Low: 18 °F

    Mostly Cloudy
    and Blustery
    then Partly
    Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

  • Thursday Night

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

    Low: 27 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 26. Southwest wind 5 to 7 mph.
Monday
Sunny, with a high near 51. Southwest wind 6 to 10 mph.
Monday Night
Mostly clear, with a low around 36. Southwest wind 5 to 8 mph.
Tuesday
Increasing clouds, with a high near 59. Southwest wind 9 to 16 mph, with gusts as high as 24 mph.
Tuesday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 37. West wind 8 to 13 mph.
Wednesday
Mostly cloudy, with a high near 43. Breezy.
Wednesday Night
Partly cloudy, with a low around 18. Blustery.
Thursday
Mostly sunny, with a high near 34.
Thursday Night
Mostly cloudy, with a low around 27.
Friday
Partly sunny, with a high near 43.
Friday Night
Mostly cloudy, with a low around 22.
Saturday
Mostly cloudy, with a high near 31.
Saturday Night
Partly cloudy, with a low around 14.
Sunday
Mostly sunny, with a high near 32.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSW Portage Des Sioux MO
 38.89°N 90.36°W (Elev. 427 ft)
Last Update:
4:36 pm CST Jan 11, 2026
Forecast Valid:
6pm CST Jan 11, 2026-6pm CST Jan 18, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation