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

1°C

33°F

Humidity 75%
Wind Speed NW 15 km/h
Barometer 1023.9 mb (30.24 in)
Dewpoint -3°C (26°F)
Visibility 16 km
Wind Chill-4°C (25°F)
Last update 11 Feb 2:54 am CST
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Overnight

    Overnight: Mostly clear, with a low around -2. North wind around 11 km/h.

    Low: -2 °C

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 10. Northwest wind 5 to 10 km/h.

    High: 10 °C

    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 0. Calm wind.

    Low: 0 °C

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly cloudy, with a high near 9. Light southeast wind increasing to 6 to 11 km/h in the morning.

    High: 9 °C

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 0. Southeast wind 5 to 10 km/h becoming calm in the evening.

    Low: 0 °C

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 13.

    High: 13 °C

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 2.

    Low: 2 °C

    Mostly Cloudy

  • Saturday

    Saturday: A 30 percent chance of rain, mainly after noon. Mostly cloudy, with a high near 12.

    High: 12 °C

    Chance Rain

  • Saturday Night

    Saturday Night: A 40 percent chance of rain. Partly cloudy, with a low around 4.

    Low: 4 °C

    Chance Rain

Detailed Forecast

Overnight
Mostly clear, with a low around -2. North wind around 11 km/h.
Wednesday
Sunny, with a high near 10. Northwest wind 5 to 10 km/h.
Wednesday Night
Increasing clouds, with a low around 0. Calm wind.
Thursday
Mostly cloudy, with a high near 9. Light southeast wind increasing to 6 to 11 km/h in the morning.
Thursday Night
Mostly cloudy, with a low around 0. Southeast wind 5 to 10 km/h becoming calm in the evening.
Friday
Mostly sunny, with a high near 13.
Friday Night
Mostly cloudy, with a low around 2.
Saturday
A 30 percent chance of rain, mainly after noon. Mostly cloudy, with a high near 12.
Saturday Night
A 40 percent chance of rain. Partly cloudy, with a low around 4.
Sunday
A 20 percent chance of rain before noon. Mostly sunny, with a high near 14.
Sunday Night
Mostly clear, with a low around 2.
Washington's Birthday
Mostly sunny, with a high near 16.
Monday Night
Mostly cloudy, with a low around 7.
Tuesday
Mostly cloudy, with a high near 18.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Portage Des Sioux MO
 38.93°N 90.27°W (Elev. 407 m)
Last Update:
1:36 am CST Feb 11, 2026
Forecast Valid:
3am CST Feb 11, 2026-6pm CST Feb 17, 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