National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

A Few Clouds

33°F

1°C

Humidity 52%
Wind Speed Calm
Barometer 30.42 in (1030.5 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Last update 28 Nov 1:54 pm CST
Extended Forecast for

2 Miles ENE Portage Des Sioux MO

Winter Weather Advisory November 29, 12:00am until November 30, 12:00am
Click here for hazard details and duration
Winter Weather Advisory

  • This Afternoon

    This Afternoon: Mostly sunny early, then becoming cloudy, with a high near 39. Calm wind becoming southeast around 5 mph.

    High: 39 °F

    Becoming
    Cloudy

  • Tonight

    Tonight: Snow, mainly after 11pm. Low around 30. Southeast wind 6 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 2 inches possible.

    Low: 30 °F

    Chance Snow
    then Snow

  • Saturday

    Saturday: Rain and snow, possibly mixed with sleet before 1pm, then rain, possibly mixed with snow between 1pm and 4pm, then rain after 4pm. High near 38. Southeast wind 14 to 18 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New snow and sleet accumulation of 2 to 4 inches possible.

    High: 38 °F

    Wintry Mix

  • Saturday Night

    Saturday Night: A chance of rain, mixing with snow after 8pm, then gradually ending. Cloudy, with a low around 23. Breezy, with a south wind 14 to 20 mph becoming west after midnight. Winds could gust as high as 33 mph. Chance of precipitation is 50%.

    Low: 23 °F

    Breezy.
    Chance
    Rain/Snow
    then Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 30. Northwest wind 10 to 16 mph, with gusts as high as 25 mph.

    High: 30 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 17.

    Low: 17 °F

    Mostly Cloudy

  • Monday

    Monday: A 30 percent chance of snow after noon. Cloudy, with a high near 29.

    High: 29 °F

    Cloudy then
    Chance Snow

  • Monday Night

    Monday Night: A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 18.

    Low: 18 °F

    Chance Snow

  • Tuesday

    Tuesday: Partly sunny, with a high near 30.

    High: 30 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly sunny early, then becoming cloudy, with a high near 39. Calm wind becoming southeast around 5 mph.
Tonight
Snow, mainly after 11pm. Low around 30. Southeast wind 6 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 2 inches possible.
Saturday
Rain and snow, possibly mixed with sleet before 1pm, then rain, possibly mixed with snow between 1pm and 4pm, then rain after 4pm. High near 38. Southeast wind 14 to 18 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New snow and sleet accumulation of 2 to 4 inches possible.
Saturday Night
A chance of rain, mixing with snow after 8pm, then gradually ending. Cloudy, with a low around 23. Breezy, with a south wind 14 to 20 mph becoming west after midnight. Winds could gust as high as 33 mph. Chance of precipitation is 50%.
Sunday
Mostly cloudy, with a high near 30. Northwest wind 10 to 16 mph, with gusts as high as 25 mph.
Sunday Night
Mostly cloudy, with a low around 17.
Monday
A 30 percent chance of snow after noon. Cloudy, with a high near 29.
Monday Night
A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 18.
Tuesday
Partly sunny, with a high near 30.
Tuesday Night
Partly cloudy, with a low around 18.
Wednesday
Partly sunny, with a high near 38.
Wednesday Night
Mostly cloudy, with a low around 18.
Thursday
Partly sunny, with a high near 30.
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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:
1:36 pm CST Nov 28, 2025
Forecast Valid:
2pm CST Nov 28, 2025-6pm CST Dec 4, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation