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

51°F

11°C

Humidity 86%
Wind Speed N 7 mph
Barometer 30.04 in (1017.1 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 18 Nov 9:54 pm CST
Extended Forecast for

2 Miles ENE Portage Des Sioux MO

  • Tonight

    Tonight: Cloudy, with a low around 45. North wind 5 to 7 mph.

    Low: 45 °F

    Cloudy

  • Wednesday

    Wednesday: Patchy fog before 7am. Otherwise, cloudy, with a high near 59. North wind around 5 mph becoming calm in the morning.

    High: 59 °F

    Patchy Fog
    then Cloudy

  • Wednesday Night

    Wednesday Night: A 20 percent chance of rain after midnight. Increasing clouds, with a low around 48. Light southeast wind.

    Low: 48 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Thursday

    Thursday: Rain likely and possibly a thunderstorm before 9am, then rain likely between 9am and 3pm, then rain likely and possibly a thunderstorm after 3pm. Cloudy, with a high near 62. South wind 5 to 8 mph. Chance of precipitation is 70%.

    High: 62 °F

    Rain Likely

  • Thursday Night

    Thursday Night: Rain likely, mainly after midnight. Cloudy, with a low around 51. Calm wind becoming north around 5 mph after midnight. Chance of precipitation is 60%.

    Low: 51 °F

    Rain Likely

  • Friday

    Friday: Rain. High near 59. Chance of precipitation is 80%.

    High: 59 °F

    Rain

  • Friday Night

    Friday Night: A 40 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Chance Rain

  • Saturday

    Saturday: Mostly sunny, with a high near 60.

    High: 60 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

Detailed Forecast

Tonight
Cloudy, with a low around 45. North wind 5 to 7 mph.
Wednesday
Patchy fog before 7am. Otherwise, cloudy, with a high near 59. North wind around 5 mph becoming calm in the morning.
Wednesday Night
A 20 percent chance of rain after midnight. Increasing clouds, with a low around 48. Light southeast wind.
Thursday
Rain likely and possibly a thunderstorm before 9am, then rain likely between 9am and 3pm, then rain likely and possibly a thunderstorm after 3pm. Cloudy, with a high near 62. South wind 5 to 8 mph. Chance of precipitation is 70%.
Thursday Night
Rain likely, mainly after midnight. Cloudy, with a low around 51. Calm wind becoming north around 5 mph after midnight. Chance of precipitation is 60%.
Friday
Rain. High near 59. Chance of precipitation is 80%.
Friday Night
A 40 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 45.
Saturday
Mostly sunny, with a high near 60.
Saturday Night
Mostly clear, with a low around 41.
Sunday
Sunny, with a high near 62.
Sunday Night
Partly cloudy, with a low around 43.
Monday
A 30 percent chance of rain. Partly sunny, with a high near 62.
Monday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 44.
Tuesday
A 40 percent chance of rain. Mostly cloudy, with a high near 58.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Portage Des Sioux MO
 38.93°N 90.3°W (Elev. 407 ft)
Last Update:
9:26 pm CST Nov 18, 2025
Forecast Valid:
10pm CST Nov 18, 2025-6pm CST Nov 25, 2025
 
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