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 43%
Wind Speed SW 8 mph
Barometer 29.99 in (1016.1 mb)
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 18 Jan 4:54 pm CST
Extended Forecast for

4 Miles E Portage Des Sioux MO

Cold Weather Advisory January 19, 03:00am until January 19, 10:00am
Click here for hazard details and duration
Cold Weather Advisory

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 10. Southwest wind 6 to 11 mph becoming northwest 13 to 18 mph after midnight. Winds could gust as high as 33 mph.

    Low: 10 °F

    Decreasing
    Clouds

  • M.L.King Day

    M.L.King Day: Sunny and cold, with a high near 20. Northwest wind 8 to 17 mph, with gusts as high as 30 mph.

    High: 20 °F

    Cold

  • Monday Night

    Monday Night: Increasing clouds, with a low around 12. West wind around 5 mph becoming calm in the evening.

    Low: 12 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly sunny, with a high near 36. Southwest wind 5 to 9 mph.

    High: 36 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 27. Southeast wind 7 to 10 mph becoming southwest after midnight. Winds could gust as high as 20 mph.

    Low: 27 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 44.

    High: 44 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 22.

    Low: 22 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 35.

    High: 35 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 22.

    Low: 22 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 10. Southwest wind 6 to 11 mph becoming northwest 13 to 18 mph after midnight. Winds could gust as high as 33 mph.
M.L.King Day
Sunny and cold, with a high near 20. Northwest wind 8 to 17 mph, with gusts as high as 30 mph.
Monday Night
Increasing clouds, with a low around 12. West wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 36. Southwest wind 5 to 9 mph.
Tuesday Night
Mostly cloudy, with a low around 27. Southeast wind 7 to 10 mph becoming southwest after midnight. Winds could gust as high as 20 mph.
Wednesday
Mostly sunny, with a high near 44.
Wednesday Night
Partly cloudy, with a low around 22.
Thursday
Sunny, with a high near 35.
Thursday Night
Partly cloudy, with a low around 22.
Friday
Mostly cloudy, with a high near 37.
Friday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 14.
Saturday
A 30 percent chance of snow. Mostly cloudy, with a high near 24.
Saturday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 5.
Sunday
A 20 percent chance of snow. Mostly sunny and cold, with a high near 20.
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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:
5:01 pm CST Jan 18, 2026
Forecast Valid:
5pm CST Jan 18, 2026-6pm CST Jan 25, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation