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.

Light Snow

25°F

-4°C

Humidity 63%
Wind Speed W 20 G 28 mph
Barometer 30.13 in (1020.7 mb)
Dewpoint 14°F (-10°C)
Visibility 8.00 mi
Wind Chill11°F (-12°C)
Last update 16 Mar 7:54 pm CDT
Extended Forecast for

Portage Des Sioux MO

  • Tonight

    Tonight: Mostly cloudy, with a low around 14. Northwest wind 13 to 17 mph, with gusts as high as 25 mph.

    Low: 14 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 35. Northwest wind 7 to 9 mph becoming south in the afternoon.

    High: 35 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A chance of snow before 4am, then a slight chance of rain. Cloudy, with a low around 30. Southeast wind 8 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.

    Low: 30 °F

    Chance Snow
    then Chance
    Rain/Snow

  • Wednesday

    Wednesday: Sunny, with a high near 64. South wind around 10 mph becoming west in the afternoon.

    High: 64 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43. West wind around 5 mph becoming calm in the evening.

    Low: 43 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 51.

    Low: 51 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 14. Northwest wind 13 to 17 mph, with gusts as high as 25 mph.
Tuesday
Increasing clouds, with a high near 35. Northwest wind 7 to 9 mph becoming south in the afternoon.
Tuesday Night
A chance of snow before 4am, then a slight chance of rain. Cloudy, with a low around 30. Southeast wind 8 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.
Wednesday
Sunny, with a high near 64. South wind around 10 mph becoming west in the afternoon.
Wednesday Night
Partly cloudy, with a low around 43. West wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 73.
Thursday Night
Partly cloudy, with a low around 46.
Friday
Mostly sunny, with a high near 78.
Friday Night
Partly cloudy, with a low around 51.
Saturday
Sunny, with a high near 78.
Saturday Night
Mostly clear, with a low around 49.
Sunday
Sunny, with a high near 72.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 55.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Portage Des Sioux MO
 38.93°N 90.36°W (Elev. 407 ft)
Last Update:
5:31 pm CDT Mar 16, 2026
Forecast Valid:
8pm CDT Mar 16, 2026-6pm CDT Mar 23, 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