Severe Thunderstorms and Flooding from the Southern Plains to the Great Lakes; Record Heat in the East

Widely scattered severe thunderstorms may produce damaging winds, hail, and flash flooding from the southern Plains into the lower Great Lakes. Elevated to locally critical fire weather conditions will persist across portions of the Southwest and Southern High Plains due to gusty winds and dry conditions. An early-season heatwave will challenge temperature records across the eastern U.S.. Read More >

Current conditions at

Fort Madison Municipal Airport (KFSW)

Lat: 40.66°NLon: 91.33°WElev: 719ft.

Overcast

64°F

18°C

Humidity 94%
Wind Speed SW 9 mph
Barometer 29.92 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 19 May 6:55 am CDT
Extended Forecast for

Hamilton IL

  • Today

    Today: Showers likely before 10am, then a slight chance of showers and thunderstorms between 10am and 11am.  Mostly cloudy, with a high near 69. Southwest wind around 15 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph.  Chance of precipitation is 60%.

    High: 69 °F

    Showers
    Likely then
    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 48. North wind around 10 mph, with gusts as high as 20 mph.

    Low: 48 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 68. Northeast wind around 10 mph, with gusts as high as 20 mph.

    High: 68 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 47. East wind around 5 mph.

    Low: 47 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 70.

    High: 70 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A 50 percent chance of showers after 1am.  Cloudy, with a low around 53.

    Low: 53 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers likely, mainly before 1pm.  Mostly cloudy, with a high near 67. Chance of precipitation is 70%.

    High: 67 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 53.

    Low: 53 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 77.

    High: 77 °F

    Mostly Cloudy

Detailed Forecast

Today
Showers likely before 10am, then a slight chance of showers and thunderstorms between 10am and 11am. Mostly cloudy, with a high near 69. Southwest wind around 15 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%.
Tonight
Mostly cloudy, with a low around 48. North wind around 10 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 68. Northeast wind around 10 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 47. East wind around 5 mph.
Thursday
Mostly cloudy, with a high near 70.
Thursday Night
A 50 percent chance of showers after 1am. Cloudy, with a low around 53.
Friday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 67. Chance of precipitation is 70%.
Friday Night
Mostly cloudy, with a low around 53.
Saturday
Mostly cloudy, with a high near 77.
Saturday Night
Mostly cloudy, with a low around 56.
Sunday
Partly sunny, with a high near 83.
Sunday Night
Mostly cloudy, with a low around 61.
Memorial Day
Partly sunny, with a high near 85.
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ABOUT THIS FORECAST

 
Point Forecast:
Hamilton IL
 40.39°N 91.36°W (Elev. 512 ft)
3:22 am CDT May 19, 2026
7am CDT May 19, 2026-6pm CDT May 25, 2026
 
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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