National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Excessive Rainfall and Potential Tropical Cyclone in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce locally considerable flash flooding over parts of the northwestern Gulf Coast, lower Mississippi River Valley, and Deep South through Thursday. Potential Tropical Cyclone One is forecast to become a tropical storm (Arthur) as it moves along or just off the northwestern Gulf coast through Wednesday. An outbreak of severe weather is forecast in the Midwest Wednesday. Read More >

Hazardous Weather Conditions

Current conditions at

Fort Madison Municipal Airport (KFSW)

Lat: 40.66°NLon: 91.33°WElev: 719ft.

Thunderstorm in Vicinity Rain

63°F

17°C

Humidity 73%
Wind Speed S 18 G 23 mph
Barometer 29.42 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 17 Jun 7:35 am CDT
Extended Forecast for

Hamilton IL

Severe T-storm Watch June 17, 07:58am until June 17, 11:00am
Click here for hazard details and duration
...
  •  
    Severe T-storm Watch June 17, 07:58am until June 17, 11:00am

    NOW until 11:00am Wed

    Severe T-storm Watch

  • Today

    High: 86 °F

    Severe
    Thunderstorms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 63. West wind 5 to 10 mph, with gusts as high as 25 mph.

    Low: 63 °F

    Chance
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 78. Northwest wind around 10 mph.

    High: 78 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 58. Northwest wind around 5 mph becoming calm in the evening.

    Low: 58 °F

    Clear

  • Juneteenth

    Juneteenth: Sunny, with a high near 83.

    High: 83 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Chance of precipitation is 70%.

    Low: 66 °F

    Partly Cloudy
    then Showers
    Likely

Detailed Forecast

Today
Showers and thunderstorms before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Some of the storms could be severe and produce heavy rainfall. High near 86. Southeast wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
Tonight
A 30 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 63. West wind 5 to 10 mph, with gusts as high as 25 mph.
Thursday
Mostly sunny, with a high near 78. Northwest wind around 10 mph.
Thursday Night
Clear, with a low around 58. Northwest wind around 5 mph becoming calm in the evening.
Juneteenth
Sunny, with a high near 83.
Friday Night
Mostly clear, with a low around 63.
Saturday
Mostly sunny, with a high near 87.
Saturday Night
Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Chance of precipitation is 70%.
Sunday
Showers, with thunderstorms also possible after 1pm. High near 80. Chance of precipitation is 90%.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 63.
Monday
Partly sunny, with a high near 78.
Monday Night
Partly cloudy, with a low around 60.
Tuesday
Mostly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hamilton IL
 40.39°N 91.39°W (Elev. 574 ft)
Last Update:
6:57 am CDT Jun 17, 2026
Forecast Valid:
7am CDT Jun 17, 2026-6pm CDT Jun 23, 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