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

46°F

8°C

Humidity 56%
Wind Speed NW 14 mph
Barometer 30.29 in (1025.6 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill40°F (4°C)
Last update 5 Apr 8:54 am CDT
Extended Forecast for

3 Miles SSW Dow IL

  • Today

    Today: Sunny, with a high near 57. Northwest wind around 15 mph, with gusts as high as 23 mph.

    High: 57 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 39. West wind 5 to 8 mph.

    Low: 39 °F

    Clear

  • Monday

    Monday: Increasing clouds, with a high near 59. Northwest wind 8 to 13 mph, with gusts as high as 20 mph.

    High: 59 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: A 20 percent chance of rain after 1am. Mostly cloudy, with a low around 35. Northwest wind around 10 mph.

    Low: 35 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 51. East wind around 10 mph.

    High: 51 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 75.

    High: 75 °F

    Slight Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 57. Northwest wind around 15 mph, with gusts as high as 23 mph.
Tonight
Clear, with a low around 39. West wind 5 to 8 mph.
Monday
Increasing clouds, with a high near 59. Northwest wind 8 to 13 mph, with gusts as high as 20 mph.
Monday Night
A 20 percent chance of rain after 1am. Mostly cloudy, with a low around 35. Northwest wind around 10 mph.
Tuesday
Mostly cloudy, with a high near 51. East wind around 10 mph.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
Mostly sunny, with a high near 72.
Wednesday Night
Partly cloudy, with a low around 53.
Thursday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 75.
Thursday Night
A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly cloudy, with a low around 54. Chance of precipitation is 30%.
Friday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 76.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 55.
Saturday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 74.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39°N 90.33°W (Elev. 597 ft)
Last Update:
6:26 am CDT Apr 5, 2026
Forecast Valid:
9am CDT Apr 5, 2026-6pm CDT Apr 11, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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