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

34°F

1°C

Humidity 76%
Wind Speed Calm
Barometer 30.04 in (1017.1 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 17 Nov 12:54 am CST
Extended Forecast for

3 Miles SSW Dow IL

  • Overnight

    Overnight: Mostly clear, with a low around 34. Calm wind becoming east around 5 mph.

    Low: 34 °F

    Mostly Clear

  • Monday

    Monday: Scattered showers, mainly after 5pm. Increasing clouds, with a high near 58. Southeast wind 5 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.

    High: 58 °F

    Sunny then
    Scattered
    Showers

  • Monday Night

    Monday Night: Showers and thunderstorms likely before 3am, then isolated showers between 3am and 5am. Mostly cloudy, with a low around 47. Southeast wind 10 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.

    Low: 47 °F

    Showers
    Likely then
    Scattered
    Showers

  • Tuesday

    Tuesday: A 20 percent chance of rain after noon. Partly sunny, with a high near 71. Southeast wind 8 to 10 mph becoming northwest in the afternoon.

    High: 71 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 46. Northeast wind 5 to 7 mph.

    Low: 46 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 62.

    High: 62 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Slight Chance
    Rain then
    Chance Rain

  • Thursday

    Thursday: Rain and possibly a thunderstorm. High near 65. Chance of precipitation is 90%.

    High: 65 °F

    Rain

  • Thursday Night

    Thursday Night: Rain likely. Mostly cloudy, with a low around 54. Chance of precipitation is 70%.

    Low: 54 °F

    Rain Likely

Detailed Forecast

Overnight
Mostly clear, with a low around 34. Calm wind becoming east around 5 mph.
Monday
Scattered showers, mainly after 5pm. Increasing clouds, with a high near 58. Southeast wind 5 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.
Monday Night
Showers and thunderstorms likely before 3am, then isolated showers between 3am and 5am. Mostly cloudy, with a low around 47. Southeast wind 10 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.
Tuesday
A 20 percent chance of rain after noon. Partly sunny, with a high near 71. Southeast wind 8 to 10 mph becoming northwest in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 46. Northeast wind 5 to 7 mph.
Wednesday
Mostly cloudy, with a high near 62.
Wednesday Night
A 50 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 49.
Thursday
Rain and possibly a thunderstorm. High near 65. Chance of precipitation is 90%.
Thursday Night
Rain likely. Mostly cloudy, with a low around 54. Chance of precipitation is 70%.
Friday
A 50 percent chance of rain. Partly sunny, with a high near 65.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 43.
Saturday
Partly sunny, with a high near 55.
Saturday Night
Partly cloudy, with a low around 39.
Sunday
Mostly sunny, with a high near 57.
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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:
9:26 pm CST Nov 16, 2025
Forecast Valid:
1am CST Nov 17, 2025-6pm CST Nov 23, 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