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

33°F

1°C

Humidity 45%
Wind Speed SE 5 mph
Barometer 29.69 in (1005.8 mb)
Dewpoint 14°F (-10°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 16 Jan 1:54 am CST
Extended Forecast for

3 Miles SSW Dow IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 26. South wind around 8 mph.

    Low: 26 °F

    Mostly Cloudy

  • Friday

    Friday: A 30 percent chance of snow, mainly after 5pm. Mostly cloudy, with a high near 44. West wind 9 to 18 mph, with gusts as high as 29 mph.

    High: 44 °F

    Partly Sunny
    then Chance
    Snow

  • Friday Night

    Friday Night: A 50 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 20. West wind 14 to 16 mph, with gusts as high as 25 mph.

    Low: 20 °F

    Chance Snow
    then Slight
    Chance Snow

  • Saturday

    Saturday: Partly sunny, with a high near 24. West wind 14 to 16 mph, with gusts as high as 24 mph.

    High: 24 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 11. Northwest wind 9 to 13 mph, with gusts as high as 20 mph.

    Low: 11 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 28.

    High: 28 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 12.

    Low: 12 °F

    Partly Cloudy

  • M.L.King Day

    M.L.King Day: Sunny, with a high near 21.

    High: 21 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 9.

    Low: 9 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 26. South wind around 8 mph.
Friday
A 30 percent chance of snow, mainly after 5pm. Mostly cloudy, with a high near 44. West wind 9 to 18 mph, with gusts as high as 29 mph.
Friday Night
A 50 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 20. West wind 14 to 16 mph, with gusts as high as 25 mph.
Saturday
Partly sunny, with a high near 24. West wind 14 to 16 mph, with gusts as high as 24 mph.
Saturday Night
Mostly clear, with a low around 11. Northwest wind 9 to 13 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny, with a high near 28.
Sunday Night
Partly cloudy, with a low around 12.
M.L.King Day
Sunny, with a high near 21.
Monday Night
Mostly clear, with a low around 9.
Tuesday
Sunny, with a high near 34.
Tuesday Night
Partly cloudy, with a low around 23.
Wednesday
Mostly sunny, with a high near 42.
Wednesday Night
Partly cloudy, with a low around 21.
Thursday
Partly sunny, with a high near 40.
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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 CST Jan 16, 2026
Forecast Valid:
1am CST Jan 16, 2026-6pm CST Jan 22, 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