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

28°F

-2°C

Humidity 78%
Wind Speed N 17 G 25 mph
Barometer 30.29 in (1026.0 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill16°F (-9°C)
Last update 7 Dec 8:54 pm CST
Extended Forecast for

3 Miles NNE Grafton IL

  • Tonight

    Tonight: Cloudy early, then gradual clearing, with a low around 21. North wind 6 to 14 mph, with gusts as high as 21 mph.

    Low: 21 °F

    Gradual
    Clearing

  • Monday

    Monday: Mostly sunny, with a high near 32. North wind around 6 mph becoming calm.

    High: 32 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a temperature rising to around 32 by 5am. South wind 6 to 10 mph.

    Low: 27 °F⇑

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 49. Southwest wind around 11 mph, with gusts as high as 20 mph.

    High: 49 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38. South wind 11 to 18 mph becoming west after midnight. Winds could gust as high as 26 mph.

    Low: 38 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a temperature falling to around 37 by 5pm.

    High: 44 °F⇓

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Thursday

    Thursday: A 40 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 33.

    High: 33 °F

    Chance Snow

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 18.

    Low: 18 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Cloudy early, then gradual clearing, with a low around 21. North wind 6 to 14 mph, with gusts as high as 21 mph.
Monday
Mostly sunny, with a high near 32. North wind around 6 mph becoming calm.
Monday Night
Partly cloudy, with a temperature rising to around 32 by 5am. South wind 6 to 10 mph.
Tuesday
Mostly sunny, with a high near 49. Southwest wind around 11 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly cloudy, with a low around 38. South wind 11 to 18 mph becoming west after midnight. Winds could gust as high as 26 mph.
Wednesday
Partly sunny, with a temperature falling to around 37 by 5pm.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 26.
Thursday
A 40 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 33.
Thursday Night
Mostly cloudy, with a low around 18.
Friday
Partly sunny, with a high near 24.
Friday Night
Mostly cloudy, with a low around 5.
Saturday
Partly sunny and cold, with a high near 18.
Saturday Night
Mostly cloudy, with a low around 7.
Sunday
Mostly sunny, with a high near 23.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE Grafton IL
 39.02°N 90.41°W (Elev. 614 ft)
Last Update:
6:51 pm CST Dec 7, 2025
Forecast Valid:
9pm CST Dec 7, 2025-6pm CST Dec 14, 2025
 
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Additional Resources

Radar & Satellite Image

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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