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

66°F

19°C

Humidity 78%
Wind Speed SW 18 G 29 mph
Barometer 29.52 in (999.4 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 8 Jan 7:54 pm CST
Extended Forecast for

2 Miles SSE Portage Des Sioux MO

  • Tonight

    Tonight: A 50 percent chance of rain and thunderstorms, mainly before 11pm. Partly cloudy, with a low around 44. South wind 15 to 18 mph becoming west after midnight. Winds could gust as high as 31 mph.

    Low: 44 °F

    Chance
    T-storms then
    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 53. West wind 6 to 16 mph becoming north in the afternoon. Winds could gust as high as 25 mph.

    High: 53 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 37. Calm wind becoming northwest around 6 mph after midnight.

    Low: 37 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Saturday

    Saturday: A 20 percent chance of rain before noon. Mostly cloudy, then gradually becoming sunny, with a high near 45. Northwest wind 7 to 15 mph, with gusts as high as 23 mph.

    High: 45 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 23. Northwest wind 10 to 14 mph, with gusts as high as 21 mph.

    Low: 23 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 35.

    High: 35 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 24.

    Low: 24 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 51.

    High: 51 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 35.

    Low: 35 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 50 percent chance of rain and thunderstorms, mainly before 11pm. Partly cloudy, with a low around 44. South wind 15 to 18 mph becoming west after midnight. Winds could gust as high as 31 mph.
Friday
Mostly cloudy, with a high near 53. West wind 6 to 16 mph becoming north in the afternoon. Winds could gust as high as 25 mph.
Friday Night
A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 37. Calm wind becoming northwest around 6 mph after midnight.
Saturday
A 20 percent chance of rain before noon. Mostly cloudy, then gradually becoming sunny, with a high near 45. Northwest wind 7 to 15 mph, with gusts as high as 23 mph.
Saturday Night
Partly cloudy, with a low around 23. Northwest wind 10 to 14 mph, with gusts as high as 21 mph.
Sunday
Sunny, with a high near 35.
Sunday Night
Mostly clear, with a low around 24.
Monday
Mostly sunny, with a high near 51.
Monday Night
Partly cloudy, with a low around 35.
Tuesday
Partly sunny, with a high near 55.
Tuesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 35.
Wednesday
Mostly cloudy, with a high near 42.
Wednesday Night
Mostly cloudy, with a low around 24.
Thursday
Mostly sunny, with a high near 38.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSE Portage Des Sioux MO
 38.91°N 90.33°W (Elev. 427 ft)
Last Update:
3:57 pm CST Jan 8, 2026
Forecast Valid:
8pm CST Jan 8, 2026-6pm CST Jan 15, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation