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

45°F

7°C

Humidity 56%
Wind Speed SW 8 mph
Barometer 29.79 in (1008.7 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 13 Mar 4:54 am CDT
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Today

    Today: Mostly sunny, with a high near 60. West wind 13 to 18 mph, with gusts as high as 31 mph.

    High: 60 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 36. Northwest wind around 6 mph becoming calm.

    Low: 36 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 65. East wind 6 to 13 mph, with gusts as high as 20 mph.

    High: 65 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 55. South wind 10 to 13 mph, with gusts as high as 21 mph.

    Low: 55 °F

    Mostly Cloudy

  • Sunday

    Sunday: Rain, with thunderstorms also possible after 4pm. High near 70. Breezy, with a south wind 15 to 22 mph, with gusts as high as 33 mph. Chance of precipitation is 90%.

    High: 70 °F

    Breezy.
    Chance Rain
    then Rain

  • Sunday Night

    Sunday Night: Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then snow likely after 1am. Some thunder is also possible. Low around 21. Blustery. Chance of precipitation is 90%. New snow accumulation of around an inch possible.

    Low: 21 °F

    Rain/Snow and
    Blustery

  • Monday

    Monday: A 30 percent chance of snow before 1pm. Mostly cloudy, with a high near 29. Blustery.

    High: 29 °F

    Chance Snow
    and Blustery

  • Monday Night

    Monday Night: Mostly clear, with a low around 12. Blustery.

    Low: 12 °F

    Mostly Clear
    and Blustery
    then Mostly
    Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 36.

    High: 36 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 60. West wind 13 to 18 mph, with gusts as high as 31 mph.
Tonight
Partly cloudy, with a low around 36. Northwest wind around 6 mph becoming calm.
Saturday
Partly sunny, with a high near 65. East wind 6 to 13 mph, with gusts as high as 20 mph.
Saturday Night
Mostly cloudy, with a low around 55. South wind 10 to 13 mph, with gusts as high as 21 mph.
Sunday
Rain, with thunderstorms also possible after 4pm. High near 70. Breezy, with a south wind 15 to 22 mph, with gusts as high as 33 mph. Chance of precipitation is 90%.
Sunday Night
Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then snow likely after 1am. Some thunder is also possible. Low around 21. Blustery. Chance of precipitation is 90%. New snow accumulation of around an inch possible.
Monday
A 30 percent chance of snow before 1pm. Mostly cloudy, with a high near 29. Blustery.
Monday Night
Mostly clear, with a low around 12. Blustery.
Tuesday
Mostly sunny, with a high near 36.
Tuesday Night
A slight chance of rain and snow after 1am. Mostly cloudy, with a low around 28. Chance of precipitation is 20%.
Wednesday
Partly sunny, with a high near 60.
Wednesday Night
Partly cloudy, with a low around 39.
Thursday
Sunny, with a high near 70.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Portage Des Sioux MO
 38.93°N 90.27°W (Elev. 407 ft)
Last Update:
3:41 am CDT Mar 13, 2026
Forecast Valid:
5am CDT Mar 13, 2026-6pm CDT Mar 19, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation