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.

Overcast

27°F

-3°C

Humidity 66%
Wind Speed SE 3 mph
Barometer 30.19 in (1023.0 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Last update 1 Feb 7:54 pm CST
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Tonight

    Tonight: A slight chance of snow before 10pm, then a chance of flurries between 10pm and 11pm. Cloudy, with a low around 19. South wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 19 °F

    Slight Chance
    Snow then
    Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 37. Calm wind becoming northwest around 5 mph.

    High: 37 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 25. Light and variable wind.

    Low: 25 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of snow before noon. Mostly cloudy, with a high near 33. Light and variable wind becoming north 5 to 8 mph in the morning.

    High: 33 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 17. North wind around 6 mph becoming calm in the evening.

    Low: 17 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 30.

    High: 30 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 14.

    Low: 14 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 40.

    High: 40 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

Detailed Forecast

Tonight
A slight chance of snow before 10pm, then a chance of flurries between 10pm and 11pm. Cloudy, with a low around 19. South wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.
Monday
Mostly cloudy, with a high near 37. Calm wind becoming northwest around 5 mph.
Monday Night
Mostly cloudy, with a low around 25. Light and variable wind.
Tuesday
A 20 percent chance of snow before noon. Mostly cloudy, with a high near 33. Light and variable wind becoming north 5 to 8 mph in the morning.
Tuesday Night
Mostly cloudy, with a low around 17. North wind around 6 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 30.
Wednesday Night
Partly cloudy, with a low around 14.
Thursday
Partly sunny, with a high near 40.
Thursday Night
Partly cloudy, with a low around 31.
Friday
Mostly sunny, with a high near 45.
Friday Night
Partly cloudy, with a low around 21.
Saturday
Sunny, with a high near 36.
Saturday Night
Partly cloudy, with a low around 24.
Sunday
Mostly sunny, with a high near 42.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Portage Des Sioux MO
 38.93°N 90.27°W (Elev. 407 ft)
Last Update:
6:46 pm CST Feb 1, 2026
Forecast Valid:
8pm CST Feb 1, 2026-6pm CST Feb 8, 2026
 
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