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

30°F

-1°C

Humidity 66%
Wind Speed SE 3 mph
Barometer 30.28 in (1025.8 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Last update 8 Dec 1:54 pm CST
Extended Forecast for

2 Miles ENE Portage Des Sioux MO

  • This Afternoon

    This Afternoon: Sunny, with a high near 32. Light and variable wind.

    High: 32 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 26. Southeast wind 5 to 9 mph becoming southwest after midnight.

    Low: 26 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly sunny, with a high near 51. Southwest wind 9 to 13 mph, with gusts as high as 21 mph.

    High: 51 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 37. Breezy, with a south wind 14 to 21 mph becoming west after midnight. Winds could gust as high as 30 mph.

    Low: 37 °F

    Mostly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Wednesday

    Wednesday: Partly sunny, with a high near 46. Breezy, with a northwest wind 14 to 24 mph, with gusts as high as 37 mph.

    High: 46 °F

    Partly Sunny
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of snow. Mostly cloudy, with a high near 37.

    High: 37 °F

    Slight Chance
    Snow

  • Thursday Night

    Thursday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 25.

    Low: 25 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 34.

    High: 34 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Sunny, with a high near 32. Light and variable wind.
Tonight
Increasing clouds, with a low around 26. Southeast wind 5 to 9 mph becoming southwest after midnight.
Tuesday
Mostly sunny, with a high near 51. Southwest wind 9 to 13 mph, with gusts as high as 21 mph.
Tuesday Night
Mostly cloudy, with a low around 37. Breezy, with a south wind 14 to 21 mph becoming west after midnight. Winds could gust as high as 30 mph.
Wednesday
Partly sunny, with a high near 46. Breezy, with a northwest wind 14 to 24 mph, with gusts as high as 37 mph.
Wednesday Night
Mostly cloudy, with a low around 25.
Thursday
A 20 percent chance of snow. Mostly cloudy, with a high near 37.
Thursday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 25.
Friday
Mostly cloudy, with a high near 34.
Friday Night
Mostly cloudy, with a low around 12.
Saturday
Partly sunny, with a high near 23.
Saturday Night
Mostly cloudy, with a low around 12.
Sunday
Mostly sunny, with a high near 28.
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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:
2:11 pm CST Dec 8, 2025
Forecast Valid:
2pm CST Dec 8, 2025-6pm CST Dec 14, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation