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

66°F

19°C

Humidity 28%
Wind Speed SE 12 mph
Barometer 30.14 in (1020.4 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 13 Nov 1:54 pm CST
Extended Forecast for

3 Miles SSW Dow IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 65. South wind 7 to 9 mph.

    High: 65 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 48. Southeast wind 6 to 8 mph.

    Low: 48 °F

    Mostly Clear

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 76. Southwest wind 6 to 9 mph.

    High: 76 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Partly cloudy, with a low around 59. Southwest wind 7 to 10 mph.

    Low: 59 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 77. Southwest wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 24 mph.

    High: 77 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 59.

    High: 59 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: A 30 percent chance of rain after noon. Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny
    then Chance
    Rain

Detailed Forecast

This Afternoon
Sunny, with a high near 65. South wind 7 to 9 mph.
Tonight
Mostly clear, with a low around 48. Southeast wind 6 to 8 mph.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 76. Southwest wind 6 to 9 mph.
Friday Night
Partly cloudy, with a low around 59. Southwest wind 7 to 10 mph.
Saturday
Partly sunny, with a high near 77. Southwest wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 24 mph.
Saturday Night
Mostly clear, with a low around 42.
Sunday
Sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 38.
Monday
A 30 percent chance of rain after noon. Mostly sunny, with a high near 57.
Monday Night
Rain likely, mainly before midnight. Mostly cloudy, with a low around 44. Chance of precipitation is 60%.
Tuesday
A 20 percent chance of rain. Partly sunny, with a high near 60.
Tuesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 43.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 58.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39°N 90.33°W (Elev. 597 ft)
Last Update:
2:26 pm CST Nov 13, 2025
Forecast Valid:
2pm CST Nov 13, 2025-6pm CST Nov 19, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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