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.

Partly Cloudy

33°F

1°C

Humidity 75%
Wind Speed E 7 mph
Barometer 30.20 in (1022.9 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 13 Feb 2:54 am CST
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Overnight

    Overnight: Clear, with a low around 32. East wind around 6 mph.

    Low: 32 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 60. Southeast wind 6 to 9 mph.

    High: 60 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 39. Southeast wind 3 to 6 mph.

    Low: 39 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Rain, mainly after 9am. High near 52. Light east wind becoming southeast 5 to 9 mph in the morning. Chance of precipitation is 80%.

    High: 52 °F

    Rain

  • Saturday Night

    Saturday Night: Rain. Low around 43. East wind 6 to 8 mph. Chance of precipitation is 90%.

    Low: 43 °F

    Rain then
    Rain Likely

  • Sunday

    Sunday: A 20 percent chance of rain before noon. Mostly sunny, with a high near 58.

    High: 58 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 62.

    High: 62 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 44.

    Low: 44 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Clear, with a low around 32. East wind around 6 mph.
Friday
Sunny, with a high near 60. Southeast wind 6 to 9 mph.
Friday Night
Increasing clouds, with a low around 39. Southeast wind 3 to 6 mph.
Saturday
Rain, mainly after 9am. High near 52. Light east wind becoming southeast 5 to 9 mph in the morning. Chance of precipitation is 80%.
Saturday Night
Rain. Low around 43. East wind 6 to 8 mph. Chance of precipitation is 90%.
Sunday
A 20 percent chance of rain before noon. Mostly sunny, with a high near 58.
Sunday Night
Mostly clear, with a low around 37.
Washington's Birthday
Mostly sunny, with a high near 62.
Monday Night
Mostly cloudy, with a low around 44.
Tuesday
Mostly cloudy, with a high near 65.
Tuesday Night
Mostly cloudy, with a low around 54.
Wednesday
Partly sunny, with a high near 72.
Wednesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 45.
Thursday
A 20 percent chance of rain. Mostly sunny, with a high near 64.
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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:
2:52 am CST Feb 13, 2026
Forecast Valid:
3am CST Feb 13, 2026-6pm CST Feb 19, 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