National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Light Rain

55°F

13°C

Humidity 83%
Wind Speed NW 7 mph
Barometer 29.92 in (1013.1 mb)
Dewpoint 50°F (10°C)
Visibility 8.00 mi
Wind Chill53°F (12°C)
Last update 3 May 10:54 am CDT
Extended Forecast for

Grafton IL

  • Today

    Today: Showers likely, with thunderstorms also possible after 2pm. Cloudy, with a high near 58. North wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 70%.

    High: 58 °F

    Showers
    Likely

  • Tonight

    Tonight: A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Cloudy, with a low around 46. North wind 8 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.

    Low: 46 °F

    Chance
    Showers

  • Sunday

    Sunday: Partly sunny, with a high near 62. North wind 10 to 13 mph, with gusts as high as 20 mph.

    High: 62 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 47. North wind 6 to 9 mph.

    Low: 47 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Monday

    Monday: Partly sunny, with a high near 62. Northwest wind around 7 mph.

    High: 62 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A 50 percent chance of showers. Mostly cloudy, with a high near 68.

    High: 68 °F

    Chance
    Showers

Detailed Forecast

Today
Showers likely, with thunderstorms also possible after 2pm. Cloudy, with a high near 58. North wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 70%.
Tonight
A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Cloudy, with a low around 46. North wind 8 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.
Sunday
Partly sunny, with a high near 62. North wind 10 to 13 mph, with gusts as high as 20 mph.
Sunday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 47. North wind 6 to 9 mph.
Monday
Partly sunny, with a high near 62. Northwest wind around 7 mph.
Monday Night
Mostly clear, with a low around 47.
Tuesday
Mostly sunny, with a high near 72.
Tuesday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 54.
Wednesday
A 50 percent chance of showers. Mostly cloudy, with a high near 68.
Wednesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 54.
Thursday
A 30 percent chance of showers. Partly sunny, with a high near 70.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 50.
Friday
A 30 percent chance of showers. Mostly sunny, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grafton IL
 38.98°N 90.42°W (Elev. 673 ft)
Last Update:
9:37 am CDT May 3, 2025
Forecast Valid:
11am CDT May 3, 2025-6pm CDT May 9, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation