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

36°F

2°C

Humidity 97%
Wind Speed Calm
Barometer 30.05 in (1017.6 mb)
Dewpoint 35°F (2°C)
Visibility 8.00 mi
Last update 10 Jan 3:54 am CST
Extended Forecast for

3 Miles SSW Dow IL

  • Overnight

    Overnight: A 40 percent chance of rain, mainly after 4am. Mostly cloudy, with a steady temperature around 41. Calm wind becoming northwest around 6 mph.

    Low: 41 °F

    Chance Rain

  • Saturday

    Saturday: Rain likely, mainly before 9am. Cloudy through mid morning, then gradual clearing, with a steady temperature around 40. Northwest wind 8 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.

    High: 40 °F

    Rain Likely
    then Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy during the early evening, then gradual clearing, with a low around 26. Northwest wind 11 to 17 mph, with gusts as high as 29 mph.

    Low: 26 °F

    Gradual
    Clearing

  • Sunday

    Sunday: Sunny, with a high near 37. Northwest wind 7 to 17 mph, with gusts as high as 25 mph.

    High: 37 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 26. Southwest wind 6 to 9 mph.

    Low: 26 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 49.

    High: 49 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 57.

    High: 57 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A 40 percent chance of rain, mainly after 4am. Mostly cloudy, with a steady temperature around 41. Calm wind becoming northwest around 6 mph.
Saturday
Rain likely, mainly before 9am. Cloudy through mid morning, then gradual clearing, with a steady temperature around 40. Northwest wind 8 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.
Saturday Night
Mostly cloudy during the early evening, then gradual clearing, with a low around 26. Northwest wind 11 to 17 mph, with gusts as high as 29 mph.
Sunday
Sunny, with a high near 37. Northwest wind 7 to 17 mph, with gusts as high as 25 mph.
Sunday Night
Mostly clear, with a low around 26. Southwest wind 6 to 9 mph.
Monday
Mostly sunny, with a high near 49.
Monday Night
Mostly clear, with a low around 36.
Tuesday
Partly sunny, with a high near 57.
Tuesday Night
Mostly cloudy, with a low around 37.
Wednesday
A 20 percent chance of rain after noon. Mostly cloudy, with a high near 42.
Wednesday Night
Partly cloudy, with a low around 21.
Thursday
Mostly sunny, with a high near 36.
Thursday Night
Mostly cloudy, with a low around 27.
Friday
Mostly cloudy, with a high near 43.
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
 39.02°N 90.33°W (Elev. 650 ft)
Last Update:
3:16 am CST Jan 10, 2026
Forecast Valid:
3am CST Jan 10, 2026-6pm CST Jan 16, 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