Current conditions at

Fort Madison Municipal Airport (KFSW)

Lat: 40.66°NLon: 91.33°WElev: 719ft.

A Few Clouds

77°F

25°C

Humidity 47%
Wind Speed Vrbl 1 mph
Barometer 30.01 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 20 Jun 12:55 pm CDT
Extended Forecast for

Pontoosuc IL

Flood Watch June 21, 07:00am until June 21, 07:00pm
Click here for hazard details and duration
Flood Watch
  • This Afternoon

    This Afternoon: Sunny, with a high near 80. Northwest wind around 5 mph.

    High: 80 °F

    Sunny

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms after 4am.  Increasing clouds, with a low around 64. North wind around 5 mph becoming east after midnight.

    Low: 64 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. Some of the storms could produce heavy rainfall.  High near 71. East wind 10 to 15 mph, with gusts as high as 25 mph.  Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

    High: 71 °F

    Heavy Rain

  • Sunday Night

    Sunday Night: Showers likely, mainly between 11pm and 1am.  Mostly cloudy, with a low around 59. Northeast wind 10 to 15 mph, with gusts as high as 25 mph.  Chance of precipitation is 60%.

    Low: 59 °F

    Showers
    Likely

  • Monday

    Monday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 77.

    High: 77 °F

    Sunny

  • Tuesday Night

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

    Low: 62 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 80. Northwest wind around 5 mph.
Tonight
A 30 percent chance of showers and thunderstorms after 4am. Increasing clouds, with a low around 64. North wind around 5 mph becoming east after midnight.
Sunday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. Some of the storms could produce heavy rainfall. High near 71. East wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Sunday Night
Showers likely, mainly between 11pm and 1am. Mostly cloudy, with a low around 59. Northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Monday
Mostly sunny, with a high near 74.
Monday Night
Mostly clear, with a low around 59.
Tuesday
Sunny, with a high near 77.
Tuesday Night
Mostly clear, with a low around 62.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Mostly clear, with a low around 61.
Thursday
Mostly sunny, with a high near 77.
Thursday Night
Mostly clear, with a low around 61.
Friday
Mostly sunny, with a high near 78.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Pontoosuc IL
 40.63°N 91.21°W (Elev. 531 ft)
12:46 pm CDT Jun 20, 2026
1pm CDT Jun 20, 2026-6pm CDT Jun 26, 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