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

Fort Madison Municipal Airport (KFSW)

Lat: 40.66°NLon: 91.33°WElev: 719ft.

Fair

28°F

-2°C

Humidity 37%
Wind Speed W 5 mph
Barometer 30.41 in
Dewpoint 5°F (-15°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 23 Feb 5:35 pm CST
Extended Forecast for

Hamilton IL

  • Tonight

    Tonight: Increasing clouds, with a low around 18. West wind 5 to 10 mph becoming south after midnight.

    Low: 18 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Cloudy, with a high near 53. Breezy, with a south wind 10 to 20 mph becoming west in the afternoon. Winds could gust as high as 35 mph.

    High: 53 °F

    Cloudy and
    Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 26. Northwest wind 5 to 10 mph.

    Low: 26 °F

    Decreasing
    Clouds

  • Wednesday

    Wednesday: Mostly sunny, with a high near 44. Northwest wind around 5 mph becoming northeast in the afternoon.

    High: 44 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Rain and snow likely. Mostly cloudy, with a low around 30. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 30 °F

    Rain/Snow
    Likely

  • Thursday

    Thursday: Mostly sunny, with a high near 46.

    High: 46 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 64.

    High: 64 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 34.

    Low: 34 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 18. West wind 5 to 10 mph becoming south after midnight.
Tuesday
Cloudy, with a high near 53. Breezy, with a south wind 10 to 20 mph becoming west in the afternoon. Winds could gust as high as 35 mph.
Tuesday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 26. Northwest wind 5 to 10 mph.
Wednesday
Mostly sunny, with a high near 44. Northwest wind around 5 mph becoming northeast in the afternoon.
Wednesday Night
Rain and snow likely. Mostly cloudy, with a low around 30. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Thursday
Mostly sunny, with a high near 46.
Thursday Night
Mostly clear, with a low around 31.
Friday
Sunny, with a high near 64.
Friday Night
Mostly clear, with a low around 34.
Saturday
Sunny, with a high near 53.
Saturday Night
Mostly cloudy, with a low around 25.
Sunday
A chance of rain and snow. Partly sunny, with a high near 40. Chance of precipitation is 40%.
Sunday Night
A chance of rain and snow. Mostly cloudy, with a low around 25. Chance of precipitation is 40%.
Monday
A chance of snow and freezing rain. Partly sunny, with a high near 39. Chance of precipitation is 30%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hamilton IL
 40.39°N 91.36°W (Elev. 512 ft)
Last Update:
4:46 pm CST Feb 23, 2026
Forecast Valid:
5pm CST Feb 23, 2026-6pm CST Mar 2, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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