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

58°F

14°C

Humidity 51%
Wind Speed N 10 mph
Barometer 29.85 in (1010.3 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 15 Nov 11:54 pm CST
Extended Forecast for

3 Miles SSW Dow IL

  • Overnight

    Overnight: Clear, with a low around 42. North wind 8 to 10 mph, with gusts as high as 22 mph.

    Low: 42 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 57. North wind 6 to 9 mph.

    High: 57 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 34. North wind around 5 mph becoming calm in the evening.

    Low: 34 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers after 3pm. Mostly sunny, with a high near 59. Southeast wind 5 to 13 mph, with gusts as high as 22 mph.

    High: 59 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: Showers likely, with thunderstorms also possible after midnight. Mostly cloudy, with a low around 47. Southeast wind around 11 mph. Chance of precipitation is 60%.

    Low: 47 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A 20 percent chance of showers before noon. Partly sunny, with a high near 69.

    High: 69 °F

    Slight Chance
    Showers then
    Partly Sunny

  • Tuesday Night

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

    Low: 46 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 63.

    High: 63 °F

    Chance Rain

  • Wednesday Night

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

    Low: 50 °F

    Chance Rain

Detailed Forecast

Overnight
Clear, with a low around 42. North wind 8 to 10 mph, with gusts as high as 22 mph.
Sunday
Sunny, with a high near 57. North wind 6 to 9 mph.
Sunday Night
Mostly clear, with a low around 34. North wind around 5 mph becoming calm in the evening.
Monday
A 20 percent chance of showers after 3pm. Mostly sunny, with a high near 59. Southeast wind 5 to 13 mph, with gusts as high as 22 mph.
Monday Night
Showers likely, with thunderstorms also possible after midnight. Mostly cloudy, with a low around 47. Southeast wind around 11 mph. Chance of precipitation is 60%.
Tuesday
A 20 percent chance of showers before noon. Partly sunny, with a high near 69.
Tuesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 46.
Wednesday
A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 63.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 50.
Thursday
Rain. High near 63. Chance of precipitation is 80%.
Thursday Night
Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 51. Chance of precipitation is 70%.
Friday
Rain likely. Mostly cloudy, with a high near 61. Chance of precipitation is 60%.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 42.
Saturday
A 20 percent chance of rain. Partly sunny, with a high near 54.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39°N 90.33°W (Elev. 597 ft)
Last Update:
11:51 pm CST Nov 15, 2025
Forecast Valid:
12am CST Nov 16, 2025-6pm CST Nov 22, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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