National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Mostly Cloudy

89°F

32°C

Humidity 52%
Wind Speed SW 12 mph
Barometer 29.80 in (1008.6 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index94°F (34°C)
Last update 17 Jun 4:54 pm CDT
Extended Forecast for

3 Miles SSW Dow IL

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 72. Southwest wind 6 to 9 mph becoming southeast in the evening. Chance of precipitation is 20%.

    Low: 72 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms, mainly after 2pm. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 83. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 83 °F

    Heavy Rain

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, with a low around 66. Southwest wind 5 to 11 mph becoming northwest after midnight.

    Low: 66 °F

    Chance
    Showers then
    Partly Cloudy

  • Juneteenth

    Juneteenth: Sunny, with a high near 83. Northwest wind 5 to 7 mph.

    High: 83 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 67. Light and variable wind.

    Low: 67 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 77.

    Low: 77 °F

    Mostly Clear

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 72. Southwest wind 6 to 9 mph becoming southeast in the evening. Chance of precipitation is 20%.
Wednesday
A 50 percent chance of showers and thunderstorms, mainly after 2pm. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 83. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, with a low around 66. Southwest wind 5 to 11 mph becoming northwest after midnight.
Juneteenth
Sunny, with a high near 83. Northwest wind 5 to 7 mph.
Thursday Night
Mostly clear, with a low around 67. Light and variable wind.
Friday
Sunny, with a high near 89.
Friday Night
Mostly clear, with a low around 73.
Saturday
Sunny, with a high near 94.
Saturday Night
Mostly clear, with a low around 77.
Sunday
Sunny, with a high near 95.
Sunday Night
Mostly clear, with a low around 76.
Monday
Sunny, with a high near 94.
Monday Night
Mostly clear, with a low around 75.
Tuesday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 92.
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:
2:52 pm CDT Jun 17, 2025
Forecast Valid:
5pm CDT Jun 17, 2025-6pm CDT Jun 24, 2025
 
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