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

26°F

-3°C

Humidity 71%
Wind Speed E 6 mph
Barometer 30.13 in (1020.5 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 9 Feb 2:54 am CST
Extended Forecast for

3 Miles SSW Dow IL

  • Overnight

    Overnight: Mostly clear, with a low around 26. East wind 3 to 6 mph.

    Low: 26 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 53. Light and variable wind becoming southeast 5 to 7 mph in the afternoon.

    High: 53 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 39. Southeast wind 7 to 9 mph becoming west after midnight.

    Low: 39 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 57. Northwest wind 7 to 10 mph.

    High: 57 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 30. North wind 6 to 8 mph.

    Low: 30 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 31.

    Low: 31 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of rain after noon. Cloudy, with a high near 45.

    High: 45 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday Night

    Thursday Night: A 40 percent chance of rain. Cloudy, with a low around 32.

    Low: 32 °F

    Chance Rain

Detailed Forecast

Overnight
Mostly clear, with a low around 26. East wind 3 to 6 mph.
Monday
Sunny, with a high near 53. Light and variable wind becoming southeast 5 to 7 mph in the afternoon.
Monday Night
Mostly clear, with a low around 39. Southeast wind 7 to 9 mph becoming west after midnight.
Tuesday
Sunny, with a high near 57. Northwest wind 7 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 30. North wind 6 to 8 mph.
Wednesday
Mostly sunny, with a high near 48.
Wednesday Night
Mostly cloudy, with a low around 31.
Thursday
A 30 percent chance of rain after noon. Cloudy, with a high near 45.
Thursday Night
A 40 percent chance of rain. Cloudy, with a low around 32.
Friday
A 20 percent chance of rain. Mostly cloudy, with a high near 44.
Friday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 31.
Saturday
A 40 percent chance of rain. Mostly cloudy, with a high near 44.
Saturday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 32.
Sunday
A 20 percent chance of rain. Mostly sunny, with a high near 46.
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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:
2:57 am CST Feb 9, 2026
Forecast Valid:
3am CST Feb 9, 2026-6pm CST Feb 15, 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