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

51°F

11°C

Humidity 29%
Wind Speed SW 15 mph
Barometer 29.89 in (1012.3 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 11 Nov 12:54 pm CST
Extended Forecast for

Grafton IL

  • Veterans Day

    Veterans Day: Cloudy early, then gradual clearing, with a high near 57. Southwest wind 9 to 15 mph, with gusts as high as 30 mph.

    High: 57 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Clear, with a low around 38. West wind 6 to 9 mph, with gusts as high as 20 mph.

    Low: 38 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 63. Northwest wind 6 to 10 mph.

    High: 63 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 39. West wind around 6 mph becoming calm after midnight.

    Low: 39 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 63. Calm wind becoming south 5 to 9 mph in the morning.

    High: 63 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 49.

    Low: 49 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

Detailed Forecast

Veterans Day
Cloudy early, then gradual clearing, with a high near 57. Southwest wind 9 to 15 mph, with gusts as high as 30 mph.
Tonight
Clear, with a low around 38. West wind 6 to 9 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 63. Northwest wind 6 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 39. West wind around 6 mph becoming calm after midnight.
Thursday
Partly sunny, with a high near 63. Calm wind becoming south 5 to 9 mph in the morning.
Thursday Night
Partly cloudy, with a low around 49.
Friday
Mostly sunny, with a high near 72.
Friday Night
Partly cloudy, with a low around 57.
Saturday
Mostly sunny, with a high near 77.
Saturday Night
A 30 percent chance of rain after midnight. Partly cloudy, with a low around 55.
Sunday
A 40 percent chance of rain. Mostly sunny, with a high near 68.
Sunday Night
A 30 percent chance of rain. Partly cloudy, with a low around 46.
Monday
A 40 percent chance of rain. Partly sunny, with a high near 57.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grafton IL
 38.98°N 90.42°W (Elev. 673 ft)
Last Update:
12:31 pm CST Nov 11, 2025
Forecast Valid:
1pm CST Nov 11, 2025-6pm CST Nov 17, 2025
 
Forecast Discussion
 
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Additional Resources

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