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.

Mostly Cloudy

34°F

1°C

Humidity 76%
Wind Speed S 3 mph
Barometer 30.07 in (1018.5 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 3 Dec 12:54 pm CST
Extended Forecast for

2 Miles ENE Portage Des Sioux MO

  • This Afternoon

    This Afternoon: A 50 percent chance of snow, mainly after 3pm. Cloudy, with a high near 34. Southwest wind 3 to 7 mph.

    High: 34 °F

    Chance Snow

  • Tonight

    Tonight: Snow likely before 2am, then a chance of flurries between 2am and 3am. Cloudy, with a low around 10. Light northwest wind becoming north 9 to 14 mph in the evening. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 10 °F

    Snow Likely
    then Slight
    Chance Snow

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 21. North wind 3 to 8 mph.

    High: 21 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 9. Light and variable wind.

    Low: 9 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 37. South wind 3 to 6 mph.

    High: 37 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 22.

    Low: 22 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 36.

    High: 36 °F

    Partly Sunny

  • Saturday Night

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

    Low: 23 °F

    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of rain and snow after noon. Mostly cloudy, with a high near 35. Chance of precipitation is 20%.

    High: 35 °F

    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

Detailed Forecast

This Afternoon
A 50 percent chance of snow, mainly after 3pm. Cloudy, with a high near 34. Southwest wind 3 to 7 mph.
Tonight
Snow likely before 2am, then a chance of flurries between 2am and 3am. Cloudy, with a low around 10. Light northwest wind becoming north 9 to 14 mph in the evening. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 21. North wind 3 to 8 mph.
Thursday Night
Partly cloudy, with a low around 9. Light and variable wind.
Friday
Mostly sunny, with a high near 37. South wind 3 to 6 mph.
Friday Night
Mostly cloudy, with a low around 22.
Saturday
Partly sunny, with a high near 36.
Saturday Night
Mostly cloudy, with a low around 23.
Sunday
A slight chance of rain and snow after noon. Mostly cloudy, with a high near 35. Chance of precipitation is 20%.
Sunday Night
Mostly cloudy, with a low around 21.
Monday
Partly sunny, with a high near 34.
Monday Night
Mostly cloudy, with a low around 25.
Tuesday
Partly sunny, with a high near 42.
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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:
12:11 pm CST Dec 3, 2025
Forecast Valid:
1pm CST Dec 3, 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