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

24°F

-4°C

Humidity 52%
Wind Speed NE 6 mph
Barometer 30.28 in (1025.8 mb)
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Wind Chill17°F (-8°C)
Last update 29 Jan 1:54 am CST
Extended Forecast for

3 Miles SSW Dow IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 11. Northeast wind around 7 mph.

    Low: 11 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of snow after 4pm. Cloudy, with a high near 22. Northeast wind 6 to 8 mph.

    High: 22 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Thursday Night

    Thursday Night: A 30 percent chance of snow, mainly before 7pm. Mostly cloudy, with a low around 4. North wind around 7 mph.

    Low: 4 °F

    Chance Snow
    then Mostly
    Cloudy

  • Friday

    Friday: Mostly sunny and cold, with a high near 17. North wind 6 to 11 mph.

    High: 17 °F

    Cold

  • Friday Night

    Friday Night: Partly cloudy, with a low around 4. North wind 9 to 11 mph.

    Low: 4 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny and cold, with a high near 19.

    High: 19 °F

    Cold

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 1.

    Low: 1 °F

    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of snow after noon. Partly sunny, with a high near 27.

    High: 27 °F

    Partly Sunny
    then Slight
    Chance Snow

  • Sunday Night

    Sunday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 18.

    Low: 18 °F

    Slight Chance
    Snow then
    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 11. Northeast wind around 7 mph.
Thursday
A 20 percent chance of snow after 4pm. Cloudy, with a high near 22. Northeast wind 6 to 8 mph.
Thursday Night
A 30 percent chance of snow, mainly before 7pm. Mostly cloudy, with a low around 4. North wind around 7 mph.
Friday
Mostly sunny and cold, with a high near 17. North wind 6 to 11 mph.
Friday Night
Partly cloudy, with a low around 4. North wind 9 to 11 mph.
Saturday
Sunny and cold, with a high near 19.
Saturday Night
Mostly clear, with a low around 1.
Sunday
A 20 percent chance of snow after noon. Partly sunny, with a high near 27.
Sunday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 18.
Monday
Partly sunny, with a high near 34.
Monday Night
Mostly cloudy, with a low around 20.
Tuesday
Mostly cloudy, with a high near 34.
Tuesday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 22.
Wednesday
A 30 percent chance of snow. Mostly cloudy, with a high near 34.
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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:
2:36 am CST Jan 29, 2026
Forecast Valid:
2am CST Jan 29, 2026-6pm CST Feb 4, 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