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

15°F

-9°C

Humidity 70%
Wind Speed N 7 mph
Barometer 30.46 in (1031.8 mb)
Dewpoint 7°F (-14°C)
Visibility NA
Wind Chill5°F (-15°C)
Last update 4 Dec 8:54 am CST
Extended Forecast for

2 Miles ENE Portage Des Sioux MO

  • Today

    Today: Partly sunny, with a high near 22. North wind 5 to 7 mph.

    High: 22 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 10. Northeast wind around 5 mph becoming calm in the evening.

    Low: 10 °F

    Partly Cloudy

  • 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 24. South wind around 6 mph becoming calm after midnight.

    Low: 24 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 36. Calm wind becoming northeast around 6 mph in the afternoon.

    High: 36 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A chance of freezing rain after midnight. Mostly cloudy, with a low around 25. Chance of precipitation is 30%.

    Low: 25 °F

    Mostly Cloudy
    then Chance
    Freezing Rain

  • Sunday

    Sunday: A 20 percent chance of snow before noon. Mostly cloudy, with a high near 32.

    High: 32 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 16.

    Low: 16 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 31.

    High: 31 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 22. North wind 5 to 7 mph.
Tonight
Partly cloudy, with a low around 10. 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 24. South wind around 6 mph becoming calm after midnight.
Saturday
Partly sunny, with a high near 36. Calm wind becoming northeast around 6 mph in the afternoon.
Saturday Night
A chance of freezing rain after midnight. Mostly cloudy, with a low around 25. Chance of precipitation is 30%.
Sunday
A 20 percent chance of snow before noon. Mostly cloudy, with a high near 32.
Sunday Night
Mostly cloudy, with a low around 16.
Monday
Mostly sunny, with a high near 31.
Monday Night
Partly cloudy, with a low around 22.
Tuesday
Partly sunny, with a high near 43.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 45.
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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:
7:31 am CST Dec 4, 2025
Forecast Valid:
9am CST Dec 4, 2025-6pm CST Dec 10, 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