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

44°F

7°C

Humidity 51%
Wind Speed S 5 mph
Barometer 29.89 in (1012.3 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 13 Jan 6:54 am CST
Extended Forecast for

Portage Des Sioux MO

  • Today

    Today: Increasing clouds, with a high near 62. West wind 7 to 15 mph, with gusts as high as 26 mph.

    High: 62 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A 40 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 35. West wind 8 to 13 mph, with gusts as high as 20 mph.

    Low: 35 °F

    Chance Rain

  • Wednesday

    Wednesday: Partly sunny, with a temperature falling to around 31 by 5pm. North wind 13 to 18 mph, with gusts as high as 30 mph.

    High: 38 °F⇓

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 17. North wind 7 to 14 mph, with gusts as high as 22 mph.

    Low: 17 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 34. Northwest wind 6 to 8 mph becoming south in the afternoon.

    High: 34 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Chance Snow

  • Friday

    Friday: Partly sunny, with a high near 43. Breezy.

    High: 43 °F

    Partly Sunny
    then Mostly
    Cloudy and
    Breezy

  • Friday Night

    Friday Night: A slight chance of rain and snow before midnight. Mostly cloudy, with a low around 21. Chance of precipitation is 20%.

    Low: 21 °F

    Slight Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 30.

    High: 30 °F

    Mostly Cloudy

Detailed Forecast

Today
Increasing clouds, with a high near 62. West wind 7 to 15 mph, with gusts as high as 26 mph.
Tonight
A 40 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 35. West wind 8 to 13 mph, with gusts as high as 20 mph.
Wednesday
Partly sunny, with a temperature falling to around 31 by 5pm. North wind 13 to 18 mph, with gusts as high as 30 mph.
Wednesday Night
Mostly clear, with a low around 17. North wind 7 to 14 mph, with gusts as high as 22 mph.
Thursday
Mostly sunny, with a high near 34. Northwest wind 6 to 8 mph becoming south in the afternoon.
Thursday Night
A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 27.
Friday
Partly sunny, with a high near 43. Breezy.
Friday Night
A slight chance of rain and snow before midnight. Mostly cloudy, with a low around 21. Chance of precipitation is 20%.
Saturday
Mostly cloudy, with a high near 30.
Saturday Night
Mostly cloudy, with a low around 9.
Sunday
Mostly sunny, with a high near 25.
Sunday Night
Partly cloudy, with a low around 12.
M.L.King Day
Mostly sunny, with a high near 34.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Portage Des Sioux MO
 38.93°N 90.36°W (Elev. 407 ft)
Last Update:
5:21 am CST Jan 13, 2026
Forecast Valid:
7am CST Jan 13, 2026-6pm CST Jan 19, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation