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

24°F

-4°C

Humidity 77%
Wind Speed E 3 mph
Barometer 30.12 in (1020.3 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Last update 9 Feb 4:54 am CST
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Today

    Today: Sunny, with a high near 54. Light and variable wind becoming south around 6 mph in the afternoon.

    High: 54 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 40. Southeast wind around 7 mph becoming west after midnight.

    Low: 40 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 59. Northwest wind 5 to 10 mph.

    High: 59 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 30. North wind around 6 mph.

    Low: 30 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 50. North wind around 6 mph.

    High: 50 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of rain after noon. Mostly cloudy, with a high near 45.

    High: 45 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Thursday Night

    Thursday Night: A 40 percent chance of rain. Cloudy, with a low around 32.

    Low: 32 °F

    Chance Rain

  • Friday

    Friday: A 20 percent chance of rain. Mostly cloudy, with a high near 45.

    High: 45 °F

    Slight Chance
    Rain

Detailed Forecast

Today
Sunny, with a high near 54. Light and variable wind becoming south around 6 mph in the afternoon.
Tonight
Mostly clear, with a low around 40. Southeast wind around 7 mph becoming west after midnight.
Tuesday
Sunny, with a high near 59. Northwest wind 5 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 30. North wind around 6 mph.
Wednesday
Mostly sunny, with a high near 50. North wind around 6 mph.
Wednesday Night
Mostly cloudy, with a low around 32.
Thursday
A 20 percent chance of rain after noon. Mostly cloudy, with a high near 45.
Thursday Night
A 40 percent chance of rain. Cloudy, with a low around 32.
Friday
A 20 percent chance of rain. Mostly cloudy, with a high near 45.
Friday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 31.
Saturday
A 40 percent chance of rain. Mostly cloudy, with a high near 45.
Saturday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 32.
Sunday
A 20 percent chance of rain. Sunny, with a high near 48.
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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:
3:52 am CST Feb 9, 2026
Forecast Valid:
5am CST Feb 9, 2026-6pm CST Feb 15, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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