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.

Partly Cloudy

57°F

14°C

Humidity 87%
Wind Speed NW 8 mph
Barometer 29.91 in (1012.5 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 10 May 2:54 am CDT
Extended Forecast for

Grafton IL

  • Overnight

    Overnight: Partly cloudy, with a low around 55. North wind 6 to 8 mph.

    Low: 55 °F

    Partly Cloudy

  • Sunday

    Sunday: Increasing clouds, with a high near 68. North wind 7 to 9 mph.

    High: 68 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Mostly cloudy, then gradually becoming clear, with a low around 46. North wind around 6 mph becoming calm in the evening.

    Low: 46 °F

    Decreasing
    Clouds

  • Monday

    Monday: Sunny, with a high near 74. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 74 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 51. Light and variable wind becoming south around 5 mph after midnight.

    Low: 51 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 57.

    Low: 57 °F

    Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: Sunny, with a high near 74.

    High: 74 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 49.

    Low: 49 °F

    Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 55. North wind 6 to 8 mph.
Sunday
Increasing clouds, with a high near 68. North wind 7 to 9 mph.
Sunday Night
Mostly cloudy, then gradually becoming clear, with a low around 46. North wind around 6 mph becoming calm in the evening.
Monday
Sunny, with a high near 74. Calm wind becoming west 5 to 7 mph in the afternoon.
Monday Night
Clear, with a low around 51. Light and variable wind becoming south around 5 mph after midnight.
Tuesday
Sunny, with a high near 81.
Tuesday Night
A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 57.
Wednesday
Sunny, with a high near 74.
Wednesday Night
Clear, with a low around 49.
Thursday
Sunny, with a high near 76.
Thursday Night
A 30 percent chance of showers. Partly cloudy, with a low around 57.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 86.
Friday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
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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:
2:26 am CDT May 10, 2026
Forecast Valid:
3am CDT May 10, 2026-6pm CDT May 16, 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