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.

Fair

43°F

6°C

Humidity 71%
Wind Speed W 12 mph
Barometer 30.30 in (1025.9 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 6 Apr 6:54 am CDT
Extended Forecast for

Grafton IL

  • Today

    Today: Sunny, with a high near 61. Northwest wind 9 to 13 mph, with gusts as high as 22 mph.

    High: 61 °F

    Sunny

  • Tonight

    Tonight: A 20 percent chance of rain after 2am. Increasing clouds, with a low around 36. Northeast wind 8 to 13 mph, with gusts as high as 22 mph.

    Low: 36 °F

    Partly Cloudy
    then Slight
    Chance Rain

  • Tuesday

    Tuesday: A 20 percent chance of rain before 10am. Mostly cloudy, with a high near 52. East wind around 11 mph.

    High: 52 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41. Southeast wind around 10 mph.

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 72. South wind 10 to 15 mph, with gusts as high as 24 mph.

    High: 72 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 71. Chance of precipitation is 30%.

    High: 71 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 57.

    Low: 57 °F

    Chance
    T-storms

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 71. Chance of precipitation is 50%.

    High: 71 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 61. Northwest wind 9 to 13 mph, with gusts as high as 22 mph.
Tonight
A 20 percent chance of rain after 2am. Increasing clouds, with a low around 36. Northeast wind 8 to 13 mph, with gusts as high as 22 mph.
Tuesday
A 20 percent chance of rain before 10am. Mostly cloudy, with a high near 52. East wind around 11 mph.
Tuesday Night
Mostly cloudy, with a low around 41. Southeast wind around 10 mph.
Wednesday
Partly sunny, with a high near 72. South wind 10 to 15 mph, with gusts as high as 24 mph.
Wednesday Night
Partly cloudy, with a low around 55.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 71. Chance of precipitation is 30%.
Thursday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 57.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 71. Chance of precipitation is 50%.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 56.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 78.
Saturday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80.
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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:
7:36 am CDT Apr 6, 2026
Forecast Valid:
7am CDT Apr 6, 2026-6pm CDT Apr 12, 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