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

34°F

1°C

Humidity 89%
Wind Speed E 8 mph
Barometer 30.30 in (1026.3 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 2 Mar 1:54 am CST
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Overnight

    Overnight: Rain and snow likely, becoming all rain after 3am. Cloudy, with a low around 33. East wind around 10 mph. Chance of precipitation is 70%. Total nighttime snow accumulation of less than a half inch possible.

    Low: 33 °F

    Rain/Snow
    Likely

  • Monday

    Monday: A chance of drizzle, mainly before 2pm. Cloudy, with a high near 43. East wind 8 to 10 mph.

    High: 43 °F

    Chance
    Drizzle

  • Monday Night

    Monday Night: Rain, mainly after 2am. Low around 39. East wind 5 to 7 mph. Chance of precipitation is 90%.

    Low: 39 °F

    Cloudy then
    Rain

  • Tuesday

    Tuesday: Rain, with thunderstorms also possible after noon. High near 61. Southeast wind 5 to 7 mph. Chance of precipitation is 90%.

    High: 61 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain, with thunderstorms also possible after 9pm. Low around 51. East wind around 6 mph becoming south after midnight. Chance of precipitation is 80%.

    Low: 51 °F

    Rain

  • Wednesday

    Wednesday: Rain and possibly a thunderstorm. High near 66. Chance of precipitation is 80%.

    High: 66 °F

    Rain

  • Wednesday Night

    Wednesday Night: Rain and possibly a thunderstorm. Low around 53. Chance of precipitation is 80%.

    Low: 53 °F

    Rain

  • Thursday

    Thursday: Rain likely, mainly before noon. Partly sunny, with a high near 69. Chance of precipitation is 60%.

    High: 69 °F

    Rain Likely
    then Chance
    Rain

  • Thursday Night

    Thursday Night: A chance of rain, with thunderstorms also possible after midnight. Mostly cloudy, with a low around 55. Chance of precipitation is 50%.

    Low: 55 °F

    Chance Rain
    then Chance
    T-storms

Detailed Forecast

Overnight
Rain and snow likely, becoming all rain after 3am. Cloudy, with a low around 33. East wind around 10 mph. Chance of precipitation is 70%. Total nighttime snow accumulation of less than a half inch possible.
Monday
A chance of drizzle, mainly before 2pm. Cloudy, with a high near 43. East wind 8 to 10 mph.
Monday Night
Rain, mainly after 2am. Low around 39. East wind 5 to 7 mph. Chance of precipitation is 90%.
Tuesday
Rain, with thunderstorms also possible after noon. High near 61. Southeast wind 5 to 7 mph. Chance of precipitation is 90%.
Tuesday Night
Rain, with thunderstorms also possible after 9pm. Low around 51. East wind around 6 mph becoming south after midnight. Chance of precipitation is 80%.
Wednesday
Rain and possibly a thunderstorm. High near 66. Chance of precipitation is 80%.
Wednesday Night
Rain and possibly a thunderstorm. Low around 53. Chance of precipitation is 80%.
Thursday
Rain likely, mainly before noon. Partly sunny, with a high near 69. Chance of precipitation is 60%.
Thursday Night
A chance of rain, with thunderstorms also possible after midnight. Mostly cloudy, with a low around 55. Chance of precipitation is 50%.
Friday
Rain likely and possibly a thunderstorm before noon, then a chance of rain. Partly sunny, with a high near 78. Chance of precipitation is 60%.
Friday Night
Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 55. Chance of precipitation is 70%.
Saturday
A 50 percent chance of rain. Cloudy, with a high near 67.
Saturday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 44.
Sunday
A 20 percent chance of rain. Mostly cloudy, with a high near 66.
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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:
12:56 am CST Mar 2, 2026
Forecast Valid:
2am CST Mar 2, 2026-6pm CDT Mar 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