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.

A Few Clouds

51°F

11°C

Humidity 77%
Wind Speed E 6 mph
Barometer 30.05 in (1017.6 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 14 Nov 7:54 am CST
Extended Forecast for

Grafton IL

  • Today

    Today: Sunny, with a high near 77. East wind 5 to 10 mph becoming southwest in the morning.

    High: 77 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 60. South wind 6 to 9 mph.

    Low: 60 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Partly sunny, with a high near 76. Southwest wind 9 to 14 mph becoming west in the afternoon. Winds could gust as high as 24 mph.

    High: 76 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 44. North wind 6 to 9 mph.

    Low: 44 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 59. North wind 5 to 7 mph.

    High: 59 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Monday

    Monday: A 30 percent chance of rain after noon. Mostly sunny, with a high near 56.

    High: 56 °F

    Mostly Sunny
    then Chance
    Rain

  • Monday Night

    Monday Night: Rain likely, mainly before midnight. Mostly cloudy, with a low around 44. Chance of precipitation is 60%.

    Low: 44 °F

    Rain Likely

  • Tuesday

    Tuesday: A 20 percent chance of rain before noon. Partly sunny, with a high near 54.

    High: 54 °F

    Slight Chance
    Rain then
    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 77. East wind 5 to 10 mph becoming southwest in the morning.
Tonight
Increasing clouds, with a low around 60. South wind 6 to 9 mph.
Saturday
Partly sunny, with a high near 76. Southwest wind 9 to 14 mph becoming west in the afternoon. Winds could gust as high as 24 mph.
Saturday Night
Mostly clear, with a low around 44. North wind 6 to 9 mph.
Sunday
Sunny, with a high near 59. North wind 5 to 7 mph.
Sunday Night
Mostly clear, with a low around 40.
Monday
A 30 percent chance of rain after noon. Mostly sunny, with a high near 56.
Monday Night
Rain likely, mainly before midnight. Mostly cloudy, with a low around 44. Chance of precipitation is 60%.
Tuesday
A 20 percent chance of rain before noon. Partly sunny, with a high near 54.
Tuesday Night
A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 38.
Wednesday
A 30 percent chance of rain. Partly sunny, with a high near 53.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 42. Chance of precipitation is 60%.
Thursday
Rain likely. Mostly cloudy, with a high near 56. Chance of precipitation is 70%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grafton IL
 38.98°N 90.44°W (Elev. 515 ft)
Last Update:
8:26 am CST Nov 14, 2025
Forecast Valid:
8am CST Nov 14, 2025-6pm CST Nov 20, 2025
 
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