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.

Fair

27°F

-3°C

Humidity 55%
Wind Speed SE 10 mph
Barometer 30.01 in (1016.6 mb)
Dewpoint 13°F (-11°C)
Visibility 10.00 mi
Wind Chill18°F (-8°C)
Last update 24 Feb 7:54 am CST
Extended Forecast for

4 Miles SSW Portage Des Sioux MO

  • Today

    Today: Mostly cloudy, with a high near 58. Breezy, with a south wind 13 to 20 mph becoming southwest in the afternoon. Winds could gust as high as 34 mph.

    High: 58 °F

    Mostly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Tonight

    Tonight: Mostly cloudy, with a low around 33. Southwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.

    Low: 33 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 52. Calm wind becoming northeast around 6 mph in the afternoon.

    High: 52 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Rain likely, mainly after midnight. Mostly cloudy, with a low around 36. East wind 6 to 8 mph. Chance of precipitation is 60%.

    Low: 36 °F

    Rain Likely

  • Thursday

    Thursday: A 20 percent chance of rain before noon. Partly sunny, with a high near 51. East wind 6 to 10 mph becoming northwest in the afternoon.

    High: 51 °F

    Slight Chance
    Rain then
    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 33.

    Low: 33 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 58. Breezy, with a south wind 13 to 20 mph becoming southwest in the afternoon. Winds could gust as high as 34 mph.
Tonight
Mostly cloudy, with a low around 33. Southwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.
Wednesday
Partly sunny, with a high near 52. Calm wind becoming northeast around 6 mph in the afternoon.
Wednesday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 36. East wind 6 to 8 mph. Chance of precipitation is 60%.
Thursday
A 20 percent chance of rain before noon. Partly sunny, with a high near 51. East wind 6 to 10 mph becoming northwest in the afternoon.
Thursday Night
Mostly clear, with a low around 33.
Friday
Sunny, with a high near 65.
Friday Night
Mostly clear, with a low around 39.
Saturday
Sunny, with a high near 66.
Saturday Night
Partly cloudy, with a low around 31.
Sunday
A chance of rain and snow. Partly sunny, with a high near 45. Chance of precipitation is 30%.
Sunday Night
A chance of rain and snow. Mostly cloudy, with a low around 30. Chance of precipitation is 40%.
Monday
A chance of rain and snow. Mostly cloudy, with a high near 49. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW Portage Des Sioux MO
 38.87°N 90.36°W (Elev. 430 ft)
Last Update:
6:46 am CST Feb 24, 2026
Forecast Valid:
8am CST Feb 24, 2026-6pm CST Mar 2, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation