Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across much of northeast Texas into the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Saturday could bring areas of flooding across parts of the central Plains into the upper Midwest/Great Lakes, and Four Corners states. Read More >

Current conditions at

Fort Madison Municipal Airport (KFSW)

Lat: 40.66°NLon: 91.33°WElev: 719ft.

Partly Cloudy

88°F

31°C

Humidity 66%
Wind Speed Vrbl 2 mph
Barometer 30.16 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index98°F (37°C)
Last update 17 Sep 2:35 pm CDT
Extended Forecast for

Pontoosuc IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 87. Northwest wind around 5 mph.

    High: 87 °F

    Mostly Sunny

  • Tonight

    Tonight: A 10 percent chance of showers after 5am.  Increasing clouds, with a low around 71. North wind around 5 mph.

    Low: 71 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms, mainly before 11am.  Mostly cloudy, then gradually becoming sunny, with a high near 84. East wind 5 to 10 mph becoming southeast in the afternoon.

    High: 84 °F

    Chance
    Showers then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A 10 percent chance of showers after 5am.  Partly cloudy, with a low around 74. Southeast wind 5 to 10 mph.

    Low: 74 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: A chance of showers between 7am and 1pm.  Mostly cloudy, with a high near 87. Chance of precipitation is 30%.

    High: 87 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm, then showers after 1am.  Low around 72. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 72 °F

    Showers

  • Sunday

    Sunday: Showers likely, with thunderstorms also possible after 1pm.  Mostly cloudy, with a high near 78. Chance of precipitation is 70%.

    High: 78 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am.  Mostly cloudy, with a low around 64. Chance of precipitation is 60%.

    Low: 64 °F

    Chance
    T-storms then
    Showers
    Likely

  • Monday

    Monday: Showers likely, mainly before 1pm.  Mostly cloudy, with a high near 67. Chance of precipitation is 60%.

    High: 67 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 87. Northwest wind around 5 mph.
Tonight
A 10 percent chance of showers after 5am. Increasing clouds, with a low around 71. North wind around 5 mph.
Friday
A 40 percent chance of showers and thunderstorms, mainly before 11am. Mostly cloudy, then gradually becoming sunny, with a high near 84. East wind 5 to 10 mph becoming southeast in the afternoon.
Friday Night
A 10 percent chance of showers after 5am. Partly cloudy, with a low around 74. Southeast wind 5 to 10 mph.
Saturday
A chance of showers between 7am and 1pm. Mostly cloudy, with a high near 87. Chance of precipitation is 30%.
Saturday Night
Showers likely and possibly a thunderstorm, then showers after 1am. Low around 72. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 78. Chance of precipitation is 70%.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Monday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 67. Chance of precipitation is 60%.
Monday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 60.
Tuesday
Mostly cloudy, with a high near 64.
Tuesday Night
Mostly cloudy, with a low around 57.
Wednesday
Partly sunny, with a high near 70.
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ABOUT THIS FORECAST

 
Point Forecast:
Pontoosuc IL
 40.63°N 91.21°W (Elev. 531 ft)
2:21 pm CDT Sep 17, 2026
2pm CDT Sep 17, 2026-6pm CDT Sep 23, 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