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.

A Few Clouds

83°F

28°C

Humidity 59%
Wind Speed N 8 mph
Barometer 30.03 in (1016.5 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 4 Aug 4:54 pm CDT
Extended Forecast for

Grafton IL

  • This Afternoon

    This Afternoon: Isolated showers and thunderstorms. Partly sunny, with a high near 82. Northeast wind around 6 mph. Chance of precipitation is 20%.

    High: 82 °F

    Isolated
    T-storms

  • Tonight

    Tonight: Isolated showers and thunderstorms before 10pm. Patchy fog after 5am. Otherwise, partly cloudy, with a low around 66. Northeast wind around 6 mph becoming calm after midnight. Chance of precipitation is 20%.

    Low: 66 °F

    Isolated
    T-storms then
    Patchy Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, partly sunny, with a high near 83. Light northeast wind.

    High: 83 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 68. Light northeast wind.

    Low: 68 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87. Light southeast wind.

    High: 87 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 71.

    Low: 71 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

Detailed Forecast

This Afternoon
Isolated showers and thunderstorms. Partly sunny, with a high near 82. Northeast wind around 6 mph. Chance of precipitation is 20%.
Tonight
Isolated showers and thunderstorms before 10pm. Patchy fog after 5am. Otherwise, partly cloudy, with a low around 66. Northeast wind around 6 mph becoming calm after midnight. Chance of precipitation is 20%.
Tuesday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 83. Light northeast wind.
Tuesday Night
Mostly clear, with a low around 68. Light northeast wind.
Wednesday
Sunny, with a high near 87. Light southeast wind.
Wednesday Night
Mostly clear, with a low around 70.
Thursday
Sunny, with a high near 89.
Thursday Night
Mostly clear, with a low around 71.
Friday
Sunny, with a high near 90.
Friday Night
Mostly clear, with a low around 73.
Saturday
Sunny, with a high near 90.
Saturday Night
Partly cloudy, with a low around 74.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Monday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
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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:
5:36 pm CDT Aug 4, 2025
Forecast Valid:
5pm CDT Aug 4, 2025-6pm CDT Aug 11, 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