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

61°F

16°C

Humidity 93%
Wind Speed SE 3 mph
Barometer 29.91 in (1012.3 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 17 Apr 1:54 am CDT
Extended Forecast for

3 Miles SSW Dow IL

  • Overnight

    Overnight: Mostly clear, with a low around 59. South wind around 6 mph.

    Low: 59 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 3pm. Increasing clouds, with a high near 84. South wind 8 to 17 mph, with gusts as high as 28 mph.

    High: 84 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms. Low around 46. South wind 13 to 15 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 100%.

    Low: 46 °F

    T-storms

  • Saturday

    Saturday: Showers likely, mainly before 7am. Cloudy through mid morning, then gradual clearing, with a high near 57. Northwest wind around 18 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.

    High: 57 °F

    Showers
    Likely then
    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 38. West wind 6 to 14 mph, with gusts as high as 21 mph.

    Low: 38 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Sunday Night

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

    Low: 42 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 69.

    High: 69 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 59. South wind around 6 mph.
Friday
A 20 percent chance of showers and thunderstorms after 3pm. Increasing clouds, with a high near 84. South wind 8 to 17 mph, with gusts as high as 28 mph.
Friday Night
Showers and thunderstorms. Low around 46. South wind 13 to 15 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 100%.
Saturday
Showers likely, mainly before 7am. Cloudy through mid morning, then gradual clearing, with a high near 57. Northwest wind around 18 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.
Saturday Night
Mostly clear, with a low around 38. West wind 6 to 14 mph, with gusts as high as 21 mph.
Sunday
Sunny, with a high near 65.
Sunday Night
Mostly clear, with a low around 42.
Monday
Sunny, with a high near 69.
Monday Night
Mostly clear, with a low around 51.
Tuesday
Mostly sunny, with a high near 77.
Tuesday Night
Partly cloudy, with a low around 55.
Wednesday
Sunny, with a high near 80.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
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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:
1:26 am CDT Apr 17, 2026
Forecast Valid:
2am CDT Apr 17, 2026-6pm CDT Apr 23, 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