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A Large and Slow-Moving Storm System Producing Thunderstorms and Heavy Rain

A slow-moving and large storm system will produce widespread strong to severe thunderstorms and heavy rainfall with possible flooding from the Midwest and Ohio Valley to the Southern U.S. into late week. Record-breaking heat is possible in central California. Read More >

Hazardous Weather Conditions

Current conditions at

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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Overcast

71°F

22°C

Humidity 68%
Wind Speed SE 13 mph
Barometer 29.90 in (1012.0 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 24 May 10:54 pm CDT
Extended Forecast for

Grafton IL

  • Tonight

    Tonight: Showers and thunderstorms before 3am, then showers likely and possibly a thunderstorm between 3am and 5am, then a chance of showers and thunderstorms after 5am. Low around 66. Southeast wind around 14 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.

    Showers

    Low: 66 °F

  • Wednesday

    Wednesday: Showers and thunderstorms. High near 79. Southeast wind 14 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.

    T-storms

    High: 79 °F

  • Wednesday
    Night

    Wednesday Night: Showers and thunderstorms, mainly before 1am, then showers likely and possibly a thunderstorm after 1am. Low around 63. South wind 8 to 13 mph. Chance of precipitation is 80%.

    T-storms

    Low: 63 °F

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 72. South wind 8 to 10 mph. Chance of precipitation is 90%.

    Showers
    Likely then
    Showers

    High: 72 °F

  • Thursday
    Night

    Thursday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 58. West wind 6 to 8 mph. Chance of precipitation is 60%.

    Showers
    Likely

    Low: 58 °F

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 69.

    Chance
    Showers

    High: 69 °F

  • Friday
    Night

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

    Partly Cloudy

    Low: 55 °F

  • Saturday

    Saturday: Mostly sunny, with a high near 77.

    Mostly Sunny

    High: 77 °F

  • Saturday
    Night

    Saturday Night: Mostly clear, with a low around 62.

    Mostly Clear

    Low: 62 °F

Detailed Forecast

Tonight
Showers and thunderstorms before 3am, then showers likely and possibly a thunderstorm between 3am and 5am, then a chance of showers and thunderstorms after 5am. Low around 66. Southeast wind around 14 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.
Wednesday
Showers and thunderstorms. High near 79. Southeast wind 14 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.
Wednesday Night
Showers and thunderstorms, mainly before 1am, then showers likely and possibly a thunderstorm after 1am. Low around 63. South wind 8 to 13 mph. Chance of precipitation is 80%.
Thursday
Showers and possibly a thunderstorm. High near 72. South wind 8 to 10 mph. Chance of precipitation is 90%.
Thursday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 58. West wind 6 to 8 mph. Chance of precipitation is 60%.
Friday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 69.
Friday Night
Partly cloudy, with a low around 55.
Saturday
Mostly sunny, with a high near 77.
Saturday Night
Mostly clear, with a low around 62.
Sunday
Mostly sunny, with a high near 84.
Sunday Night
Partly cloudy, with a low around 70.
Memorial Day
Mostly sunny, with a high near 90.
Monday Night
Mostly clear, with a low around 72.
Tuesday
Sunny, with a high near 89.
Click Map For Forecast
Disclaimer
Map Legend
Point Forecast:
Grafton IL
 38.98°N 90.42°W (Elev. 673 ft)
Last Update:
10:12 pm CDT May 24, 2022
Forecast Valid:
11pm CDT May 24, 2022-6pm CDT May 31, 2022
 
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