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.

Fair

84°F

29°C

Humidity 22%
Wind Speed Calm
Barometer 30.04 in (1016.8 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 8 Oct 3:54 pm CDT
Extended Forecast for

Portage Des Sioux MO

  • Tonight

    Tonight: Clear, with a low around 54. Light east wind.

    Low: 54 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 90. Southeast wind 5 to 10 mph becoming south in the afternoon.

    High: 90 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 61. Southeast wind 5 to 9 mph.

    Low: 61 °F

    Clear

  • Saturday

    Saturday: Increasing clouds, with a high near 86. Southeast wind 5 to 11 mph.

    High: 86 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: A 20 percent chance of rain after 1am. Mostly cloudy, with a low around 59. Southeast wind 5 to 10 mph.

    Low: 59 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Sunday

    Sunday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 54. Light east wind.
Friday
Sunny, with a high near 90. Southeast wind 5 to 10 mph becoming south in the afternoon.
Friday Night
Clear, with a low around 61. Southeast wind 5 to 9 mph.
Saturday
Increasing clouds, with a high near 86. Southeast wind 5 to 11 mph.
Saturday Night
A 20 percent chance of rain after 1am. Mostly cloudy, with a low around 59. Southeast wind 5 to 10 mph.
Sunday
Mostly sunny, with a high near 82.
Sunday Night
Mostly clear, with a low around 59.
Columbus Day
Sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 66.
Tuesday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 87.
Tuesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 59.
Wednesday
A 20 percent chance of showers. Mostly sunny, with a high near 82.
Wednesday Night
A 40 percent chance of showers. Partly cloudy, with a low around 61.
Thursday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Portage Des Sioux MO
 38.93°N 90.36°W (Elev. 407 ft)
Last Update:
2:36 pm CDT Oct 8, 2026
Forecast Valid:
4pm CDT Oct 8, 2026-6pm CDT Oct 15, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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