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

18°F

-8°C

Humidity 92%
Wind Speed SE 3 mph
Barometer 30.09 in (1019.5 mb)
Dewpoint 16°F (-9°C)
Visibility 8.00 mi
Last update 2 Dec 10:54 pm CST
Extended Forecast for

2 Miles ENE Portage Des Sioux MO

  • Tonight

    Tonight: Mostly cloudy, with a low around 19. Southeast wind around 5 mph.

    Low: 19 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of snow after 4pm. Mostly cloudy, with a high near 39. South wind 5 to 7 mph becoming northwest in the afternoon.

    High: 39 °F

    Mostly Cloudy
    then Chance
    Snow

  • Wednesday Night

    Wednesday Night: A 50 percent chance of snow, mainly before midnight. Cloudy, then gradually becoming partly cloudy, with a low around 12. North wind 7 to 10 mph.

    Low: 12 °F

    Chance Snow
    then Slight
    Chance Snow

  • Thursday

    Thursday: Sunny, with a high near 23. North wind 5 to 7 mph becoming light and variable in the afternoon.

    High: 23 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 10. Light and variable wind.

    Low: 10 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 36.

    High: 36 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 21.

    Low: 21 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 37.

    High: 37 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 23.

    Low: 23 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 19. Southeast wind around 5 mph.
Wednesday
A 50 percent chance of snow after 4pm. Mostly cloudy, with a high near 39. South wind 5 to 7 mph becoming northwest in the afternoon.
Wednesday Night
A 50 percent chance of snow, mainly before midnight. Cloudy, then gradually becoming partly cloudy, with a low around 12. North wind 7 to 10 mph.
Thursday
Sunny, with a high near 23. North wind 5 to 7 mph becoming light and variable in the afternoon.
Thursday Night
Partly cloudy, with a low around 10. Light and variable wind.
Friday
Mostly sunny, with a high near 36.
Friday Night
Partly cloudy, with a low around 21.
Saturday
Partly sunny, with a high near 37.
Saturday Night
Mostly cloudy, with a low around 23.
Sunday
A slight chance of snow before noon, then a slight chance of rain and snow. Mostly cloudy, with a high near 34. Chance of precipitation is 20%.
Sunday Night
Mostly cloudy, with a low around 18.
Monday
Partly sunny, with a high near 34.
Monday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 25.
Tuesday
Partly sunny, with a high near 41.
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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:
9:56 pm CST Dec 2, 2025
Forecast Valid:
11pm CST Dec 2, 2025-6pm CST Dec 9, 2025
 
Forecast Discussion
 
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Additional Resources

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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