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

34°F

1°C

Humidity 73%
Wind Speed N 10 mph
Barometer 30.26 in (1024.9 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 7 Feb 12:54 am CST
Extended Forecast for

3 Miles SSW Dow IL

  • Overnight

    Overnight: Clear, with a low around 25. North wind 6 to 9 mph.

    Low: 25 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 35. Northeast wind around 7 mph becoming southeast in the afternoon.

    High: 35 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 27. Southeast wind 7 to 11 mph.

    Low: 27 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 45. Southeast wind 9 to 11 mph.

    High: 45 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 29. Southeast wind 3 to 8 mph.

    Low: 29 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 65.

    High: 65 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 36.

    Low: 36 °F

    Chance Rain

Detailed Forecast

Overnight
Clear, with a low around 25. North wind 6 to 9 mph.
Saturday
Sunny, with a high near 35. Northeast wind around 7 mph becoming southeast in the afternoon.
Saturday Night
Mostly cloudy, with a low around 27. Southeast wind 7 to 11 mph.
Sunday
Mostly sunny, with a high near 45. Southeast wind 9 to 11 mph.
Sunday Night
Mostly clear, with a low around 29. Southeast wind 3 to 8 mph.
Monday
Sunny, with a high near 57.
Monday Night
Mostly clear, with a low around 42.
Tuesday
Mostly sunny, with a high near 65.
Tuesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 36.
Wednesday
A 30 percent chance of rain, mainly before noon. Mostly cloudy, with a high near 49.
Wednesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 32.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 46.
Thursday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 32.
Friday
A 30 percent chance of rain. Mostly cloudy, with a high near 45.
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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:
12:26 am CST Feb 7, 2026
Forecast Valid:
1am CST Feb 7, 2026-6pm CST Feb 13, 2026
 
Forecast Discussion
 
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Additional Resources

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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