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.

Fair

45°F

7°C

Humidity 44%
Wind Speed E 15 mph
Barometer 30.30 in (1026.3 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 1 Mar 2:54 pm CST
Extended Forecast for

4 Miles E Portage Des Sioux MO

Winter Weather Advisory March 1, 06:00pm until March 2, 06:00am
Click here for hazard details and duration
Winter Weather Advisory

  • Tonight

    Tonight: Rain, snow, and sleet before 3am, then a chance of rain and snow between 3am and 4am. Low around 34. East wind 8 to 10 mph. Chance of precipitation is 100%. Total nighttime snow and sleet accumulation of less than one inch possible.

    Low: 34 °F

    Wintry Mix

  • Monday

    Monday: A 40 percent chance of rain, mainly before 8am. Cloudy, with a high near 47. East wind 6 to 10 mph.

    High: 47 °F

    Chance Rain
    then Cloudy

  • Monday Night

    Monday Night: Rain, mainly after midnight. Low around 40. Southeast wind around 6 mph. Chance of precipitation is 80%.

    Low: 40 °F

    Slight Chance
    Rain then
    Rain

  • Tuesday

    Tuesday: Rain. High near 64. South wind 6 to 8 mph. Chance of precipitation is 90%.

    High: 64 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain, with thunderstorms also possible after 3am. Low around 53. Southeast wind around 6 mph. Chance of precipitation is 80%.

    Low: 53 °F

    Rain

  • Wednesday

    Wednesday: Rain and possibly a thunderstorm. High near 69. Chance of precipitation is 80%.

    High: 69 °F

    Rain

  • Wednesday Night

    Wednesday Night: Rain and possibly a thunderstorm before midnight, then rain likely. Low around 52. Chance of precipitation is 80%.

    Low: 52 °F

    Rain

  • Thursday

    Thursday: Rain likely, mainly before noon. Mostly cloudy, with a high near 72. Chance of precipitation is 70%.

    High: 72 °F

    Rain Likely

  • Thursday Night

    Thursday Night: A 50 percent chance of rain and thunderstorms. Partly cloudy, with a low around 57.

    Low: 57 °F

    Chance Rain
    then Chance
    T-storms

Detailed Forecast

Tonight
Rain, snow, and sleet before 3am, then a chance of rain and snow between 3am and 4am. Low around 34. East wind 8 to 10 mph. Chance of precipitation is 100%. Total nighttime snow and sleet accumulation of less than one inch possible.
Monday
A 40 percent chance of rain, mainly before 8am. Cloudy, with a high near 47. East wind 6 to 10 mph.
Monday Night
Rain, mainly after midnight. Low around 40. Southeast wind around 6 mph. Chance of precipitation is 80%.
Tuesday
Rain. High near 64. South wind 6 to 8 mph. Chance of precipitation is 90%.
Tuesday Night
Rain, with thunderstorms also possible after 3am. Low around 53. Southeast wind around 6 mph. Chance of precipitation is 80%.
Wednesday
Rain and possibly a thunderstorm. High near 69. Chance of precipitation is 80%.
Wednesday Night
Rain and possibly a thunderstorm before midnight, then rain likely. Low around 52. Chance of precipitation is 80%.
Thursday
Rain likely, mainly before noon. Mostly cloudy, with a high near 72. Chance of precipitation is 70%.
Thursday Night
A 50 percent chance of rain and thunderstorms. Partly cloudy, with a low around 57.
Friday
Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 78. Chance of precipitation is 70%.
Friday Night
Rain likely and possibly a thunderstorm. Cloudy, with a low around 47. Chance of precipitation is 70%.
Saturday
A 50 percent chance of rain. Mostly cloudy, with a high near 63.
Saturday Night
A 30 percent chance of rain. Partly cloudy, with a low around 42.
Sunday
A 30 percent chance of rain. Mostly sunny, with a high near 69.
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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:
3:06 pm CST Mar 1, 2026
Forecast Valid:
3pm CST Mar 1, 2026-6pm CDT Mar 8, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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