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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

3 Miles SSW Dow IL

  • Overnight

    Overnight: Clear, with a low around 31. South wind around 7 mph.

    Low: 31 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 55. South wind 6 to 10 mph.

    High: 55 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 44. Southeast wind around 10 mph becoming southwest after midnight.

    Low: 44 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly sunny, with a high near 58. Southwest wind 9 to 14 mph becoming west in the afternoon. Winds could gust as high as 21 mph.

    High: 58 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 36. West wind 5 to 7 mph becoming calm after midnight.

    Low: 36 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Thursday

    Thursday: Rain likely, mainly after noon. Mostly cloudy, with a high near 59. Chance of precipitation is 70%.

    High: 59 °F

    Rain Likely

  • Thursday Night

    Thursday Night: Rain likely, mainly before midnight. Mostly cloudy, with a low around 48. Chance of precipitation is 70%.

    Low: 48 °F

    Rain Likely

Detailed Forecast

Overnight
Clear, with a low around 31. South wind around 7 mph.
Monday
Sunny, with a high near 55. South wind 6 to 10 mph.
Monday Night
Increasing clouds, with a low around 44. Southeast wind around 10 mph becoming southwest after midnight.
Tuesday
Mostly sunny, with a high near 58. Southwest wind 9 to 14 mph becoming west in the afternoon. Winds could gust as high as 21 mph.
Tuesday Night
Mostly clear, with a low around 36. West wind 5 to 7 mph becoming calm after midnight.
Wednesday
Mostly sunny, with a high near 59.
Wednesday Night
A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 46.
Thursday
Rain likely, mainly after noon. Mostly cloudy, with a high near 59. Chance of precipitation is 70%.
Thursday Night
Rain likely, mainly before midnight. Mostly cloudy, with a low around 48. Chance of precipitation is 70%.
Friday
A chance of rain and thunderstorms. Partly sunny, with a high near 59. Chance of precipitation is 50%.
Friday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 34.
Saturday
Mostly sunny, with a high near 42.
Saturday Night
Partly cloudy, with a low around 24.
Sunday
Mostly sunny, with a high near 37.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39°N 90.33°W (Elev. 597 ft)
Last Update:
2:21 am CST Jan 5, 2026
Forecast Valid:
3am CST Jan 5, 2026-6pm CST Jan 11, 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