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

20°F

-7°C

Humidity 57%
Wind Speed N 8 mph
Barometer 30.33 in (1027.5 mb)
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Wind Chill10°F (-12°C)
Last update 4 Dec 3:54 pm CST
Extended Forecast for

2 Miles ENE Portage Des Sioux MO

  • Tonight

    Tonight: Mostly clear, with a low around 6. Northeast wind around 5 mph becoming calm in the evening.

    Low: 6 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 37. Calm wind becoming south 5 to 7 mph in the morning.

    High: 37 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 25. South wind around 6 mph becoming light and variable after midnight.

    Low: 25 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 35. Light and variable wind becoming east around 6 mph in the afternoon.

    High: 35 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 27. East wind around 6 mph.

    Low: 27 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: A chance of rain and snow before noon, then a slight chance of snow. Mostly cloudy, with a high near 34. Chance of precipitation is 30%.

    High: 34 °F

    Chance
    Rain/Snow
    then Slight
    Chance Snow

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 13.

    Low: 13 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 30.

    High: 30 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 23.

    Low: 23 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 6. Northeast wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 37. Calm wind becoming south 5 to 7 mph in the morning.
Friday Night
Mostly cloudy, with a low around 25. South wind around 6 mph becoming light and variable after midnight.
Saturday
Partly sunny, with a high near 35. Light and variable wind becoming east around 6 mph in the afternoon.
Saturday Night
A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 27. East wind around 6 mph.
Sunday
A chance of rain and snow before noon, then a slight chance of snow. Mostly cloudy, with a high near 34. Chance of precipitation is 30%.
Sunday Night
Mostly cloudy, with a low around 13.
Monday
Mostly sunny, with a high near 30.
Monday Night
Partly cloudy, with a low around 23.
Tuesday
Mostly sunny, with a high near 42.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 44.
Wednesday Night
Mostly cloudy, with a low around 21.
Thursday
Partly sunny, with a high near 34.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Portage Des Sioux MO
 38.93°N 90.3°W (Elev. 407 ft)
Last Update:
3:16 pm CST Dec 4, 2025
Forecast Valid:
4pm CST Dec 4, 2025-6pm CST Dec 11, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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