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

69°F

21°C

Humidity 51%
Wind Speed NW 7 mph
Barometer 29.69 in (1004.9 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 15 Nov 4:54 pm CST
Extended Forecast for

3 Miles SSW Dow IL

  • Tonight

    Tonight: Mostly clear, with a low around 42. North wind 8 to 10 mph, with gusts as high as 20 mph.

    Low: 42 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 57. North wind 5 to 9 mph.

    High: 57 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 34. Northwest 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

    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

Tonight
Mostly clear, with a low around 42. North wind 8 to 10 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 57. North wind 5 to 9 mph.
Sunday Night
Mostly clear, with a low around 34. Northwest 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:
4:46 pm CST Nov 15, 2025
Forecast Valid:
5pm CST Nov 15, 2025-6pm CST Nov 22, 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