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.

Overcast

46°F

8°C

Humidity 86%
Wind Speed W 5 mph
Barometer 29.75 in (1007.2 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 14 Jan 2:54 am CST
Extended Forecast for

Portage Des Sioux MO

  • Overnight

    Overnight: Mostly cloudy, with a low around 38. West wind 9 to 13 mph, with gusts as high as 26 mph.

    Low: 38 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Scattered sprinkles and flurries before 9am, then scattered flurries between 9am and 10am. Cloudy through mid morning, then gradual clearing, with a temperature falling to around 30 by 5pm. Breezy, with a northwest wind 15 to 22 mph, with gusts as high as 36 mph.

    High: 39 °F⇓

    Breezy.
    Scattered
    Sprinkles/Flurries
    then
    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Clear, with a low around 18. Northwest wind 8 to 15 mph, with gusts as high as 26 mph.

    Low: 18 °F

    Clear

  • Thursday

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

    High: 34 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 27. South wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 20 mph.

    Low: 27 °F

    Chance Snow

  • Friday

    Friday: Partly sunny, with a high near 44. Breezy.

    High: 44 °F

    Mostly Sunny
    then Mostly
    Cloudy and
    Breezy

  • Friday Night

    Friday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 19.

    Low: 19 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 27.

    High: 27 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 9.

    Low: 9 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 38. West wind 9 to 13 mph, with gusts as high as 26 mph.
Wednesday
Scattered sprinkles and flurries before 9am, then scattered flurries between 9am and 10am. Cloudy through mid morning, then gradual clearing, with a temperature falling to around 30 by 5pm. Breezy, with a northwest wind 15 to 22 mph, with gusts as high as 36 mph.
Wednesday Night
Clear, with a low around 18. Northwest wind 8 to 15 mph, with gusts as high as 26 mph.
Thursday
Increasing clouds, 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. South wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 20 mph.
Friday
Partly sunny, with a high near 44. Breezy.
Friday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 19.
Saturday
Partly sunny, with a high near 27.
Saturday Night
Partly cloudy, with a low around 9.
Sunday
Mostly sunny, with a high near 26.
Sunday Night
Partly cloudy, with a low around 14.
M.L.King Day
Mostly sunny, with a high near 30.
Monday Night
Mostly clear, with a low around 12.
Tuesday
Mostly sunny, with a high near 34.
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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:
3:16 am CST Jan 14, 2026
Forecast Valid:
3am CST Jan 14, 2026-6pm CST Jan 20, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation