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.

Overcast

71°F

22°C

Humidity 90%
Wind Speed Calm
Barometer 30.03 in (1016.6 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 14 Oct 10:54 am CDT
Extended Forecast for

Dow IL

  • Today

    Today: Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Cloudy, with a high near 77. North wind around 7 mph. Chance of precipitation is 60%.

    High: 77 °F

    Showers
    Likely

  • Tonight

    Tonight: A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Cloudy, with a low around 63. North wind 6 to 8 mph becoming east after midnight. Chance of precipitation is 30%.

    Low: 63 °F

    Chance
    T-storms

  • Thursday

    Thursday: Showers and possibly a thunderstorm, mainly before 3pm, then a chance of showers and thunderstorms after 3pm. High near 81. East wind 7 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 90%.

    High: 81 °F

    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 46. Breezy, with a northwest wind 9 to 14 mph increasing to 16 to 21 mph after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 80%.

    Low: 46 °F

    Showers and
    Breezy

  • Friday

    Friday: Mostly sunny, with a high near 60. Breezy, with a northwest wind 22 to 24 mph, with gusts as high as 34 mph.

    High: 60 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 38.

    Low: 38 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 69.

    High: 69 °F

    Sunny

Detailed Forecast

Today
Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Cloudy, with a high near 77. North wind around 7 mph. Chance of precipitation is 60%.
Tonight
A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Cloudy, with a low around 63. North wind 6 to 8 mph becoming east after midnight. Chance of precipitation is 30%.
Thursday
Showers and possibly a thunderstorm, mainly before 3pm, then a chance of showers and thunderstorms after 3pm. High near 81. East wind 7 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 90%.
Thursday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 46. Breezy, with a northwest wind 9 to 14 mph increasing to 16 to 21 mph after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 80%.
Friday
Mostly sunny, with a high near 60. Breezy, with a northwest wind 22 to 24 mph, with gusts as high as 34 mph.
Friday Night
Mostly clear, with a low around 37.
Saturday
Sunny, with a high near 63.
Saturday Night
Clear, with a low around 38.
Sunday
Sunny, with a high near 69.
Sunday Night
Partly cloudy, with a low around 44.
Monday
Partly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 47.
Tuesday
Mostly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Dow IL
 39.04°N 90.33°W (Elev. 623 ft)
Last Update:
5:06 am CDT Oct 14, 2026
Forecast Valid:
11am CDT Oct 14, 2026-6pm CDT Oct 20, 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