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

83°F

28°C

Humidity 44%
Wind Speed SW 14 mph
Barometer 29.95 in (1013.8 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 12 Oct 10:54 am CDT
Extended Forecast for

3 Miles W Grafton IL

  • Columbus Day

    Columbus Day: Increasing clouds, with a high near 93. Southwest wind 11 to 13 mph, with gusts as high as 22 mph.

    High: 93 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 71. Southwest wind around 9 mph.

    Low: 71 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Sunny, with a high near 95. Southwest wind 7 to 10 mph.

    High: 95 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm after 1am. Increasing clouds, with a low around 71. South wind 5 to 8 mph. Chance of precipitation is 60%.

    Low: 71 °F

    Partly Cloudy
    then Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm before 10am, then showers between 10am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 81. Light and variable wind becoming southwest around 6 mph in the morning. Chance of precipitation is 100%.

    High: 81 °F

    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.

    Low: 65 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 80. Chance of precipitation is 90%.

    High: 80 °F

    Showers

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 53.

    Low: 53 °F

    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 63. Breezy.

    High: 63 °F

    Mostly Sunny
    and Breezy

Detailed Forecast

Columbus Day
Increasing clouds, with a high near 93. Southwest wind 11 to 13 mph, with gusts as high as 22 mph.
Tonight
Mostly cloudy, then gradually becoming clear, with a low around 71. Southwest wind around 9 mph.
Tuesday
Sunny, with a high near 95. Southwest wind 7 to 10 mph.
Tuesday Night
Showers likely and possibly a thunderstorm after 1am. Increasing clouds, with a low around 71. South wind 5 to 8 mph. Chance of precipitation is 60%.
Wednesday
Showers and possibly a thunderstorm before 10am, then showers between 10am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 81. Light and variable wind becoming southwest around 6 mph in the morning. Chance of precipitation is 100%.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
Thursday
Showers and possibly a thunderstorm. High near 80. Chance of precipitation is 90%.
Thursday Night
A 50 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 53.
Friday
Mostly sunny, with a high near 63. Breezy.
Friday Night
Mostly clear, with a low around 41.
Saturday
Sunny, with a high near 62.
Saturday Night
Clear, with a low around 41.
Sunday
Sunny, with a high near 70.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles W Grafton IL
 38.98°N 90.47°W (Elev. 689 ft)
Last Update:
9:16 am CDT Oct 12, 2026
Forecast Valid:
11am CDT Oct 12, 2026-6pm CDT Oct 18, 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