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

38°F

3°C

Humidity 79%
Wind Speed N 13 mph
Barometer 30.08 in (1018.9 mb)
Dewpoint 32°F (0°C)
Visibility 7.00 mi
Wind Chill30°F (-1°C)
Last update 7 Dec 10:54 am CST
Extended Forecast for

2 Miles ENE Portage Des Sioux MO

  • Today

    Today: Cloudy, with a temperature falling to around 32 by 4pm. North wind 10 to 14 mph, with gusts as high as 22 mph.

    High: 40 °F⇓

    Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 20. North wind 5 to 11 mph.

    Low: 20 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 34. Calm wind becoming south around 5 mph in the afternoon.

    High: 34 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 25. Southeast wind 5 to 9 mph becoming southwest after midnight.

    Low: 25 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 51. Southwest wind 9 to 11 mph, with gusts as high as 21 mph.

    High: 51 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 47.

    High: 47 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Thursday

    Thursday: A 30 percent chance of snow. Mostly cloudy, with a high near 36.

    High: 36 °F

    Chance Snow

Detailed Forecast

Today
Cloudy, with a temperature falling to around 32 by 4pm. North wind 10 to 14 mph, with gusts as high as 22 mph.
Tonight
Mostly cloudy, with a low around 20. North wind 5 to 11 mph.
Monday
Mostly sunny, with a high near 34. Calm wind becoming south around 5 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 25. Southeast wind 5 to 9 mph becoming southwest after midnight.
Tuesday
Mostly sunny, with a high near 51. Southwest wind 9 to 11 mph, with gusts as high as 21 mph.
Tuesday Night
Mostly cloudy, with a low around 39.
Wednesday
Partly sunny, with a high near 47.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 26.
Thursday
A 30 percent chance of snow. Mostly cloudy, with a high near 36.
Thursday Night
Mostly cloudy, with a low around 16.
Friday
Partly sunny, with a high near 24.
Friday Night
Mostly cloudy, with a low around 5.
Saturday
Partly sunny, with a high near 21.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Portage Des Sioux MO
 38.93°N 90.3°W (Elev. 407 ft)
Last Update:
11:06 am CST Dec 7, 2025
Forecast Valid:
11am CST Dec 7, 2025-6pm CST Dec 13, 2025
 
Forecast Discussion
 
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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