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.

Partly Cloudy

45°F

7°C

Humidity 80%
Wind Speed E 5 mph
Barometer 30.05 in (1017.5 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 14 Nov 3:54 am CST
Extended Forecast for

Portage Des Sioux MO

  • Today

    Today: Sunny, with a high near 78. Southeast wind 6 to 10 mph becoming southwest in the morning.

    High: 78 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 59. Southwest wind 7 to 9 mph.

    Low: 59 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Partly sunny, with a high near 78. Southwest wind 9 to 14 mph becoming west in the afternoon. Winds could gust as high as 24 mph.

    High: 78 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 43. North wind 6 to 9 mph.

    Low: 43 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 60. Northwest wind 5 to 7 mph.

    High: 60 °F

    Sunny

  • Sunday Night

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

    Low: 39 °F

    Mostly Clear

  • Monday

    Monday: A 30 percent chance of rain after noon. Mostly sunny, with a high near 58.

    High: 58 °F

    Mostly Sunny
    then Chance
    Rain

  • Monday Night

    Monday Night: Rain likely, mainly before midnight. Mostly cloudy, with a low around 43. Chance of precipitation is 60%.

    Low: 43 °F

    Rain Likely

  • Tuesday

    Tuesday: A 20 percent chance of rain before noon. Partly sunny, with a high near 55.

    High: 55 °F

    Slight Chance
    Rain then
    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 78. Southeast wind 6 to 10 mph becoming southwest in the morning.
Tonight
Increasing clouds, with a low around 59. Southwest wind 7 to 9 mph.
Saturday
Partly sunny, with a high near 78. Southwest wind 9 to 14 mph becoming west in the afternoon. Winds could gust as high as 24 mph.
Saturday Night
Mostly clear, with a low around 43. North wind 6 to 9 mph.
Sunday
Sunny, with a high near 60. Northwest wind 5 to 7 mph.
Sunday Night
Mostly clear, with a low around 39.
Monday
A 30 percent chance of rain after noon. Mostly sunny, with a high near 58.
Monday Night
Rain likely, mainly before midnight. Mostly cloudy, with a low around 43. Chance of precipitation is 60%.
Tuesday
A 20 percent chance of rain before noon. Partly sunny, with a high near 55.
Tuesday Night
A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 37.
Wednesday
A 30 percent chance of rain. Partly sunny, with a high near 54.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 42. Chance of precipitation is 60%.
Thursday
Rain likely. Mostly cloudy, with a high near 57. Chance of precipitation is 70%.
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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:
3:16 am CST Nov 14, 2025
Forecast Valid:
4am CST Nov 14, 2025-6pm CST Nov 20, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation