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

Tropical Moisture Will Bring Heavy to Excessive Rainfall with Possible Flooding This Week

Tropical moisture will surge over the southwest into the central U.S. this week with several days of heavy to excessive rainfall which may bring limited to considerable flooding. Isolated severe thunderstorm gusts and a couple of tornadoes will be possible from southeast New Mexico into west Texas. Read More >

Current conditions at

Fort Madison Municipal Airport (KFSW)

Lat: 40.66°NLon: 91.33°WElev: 719ft.

Fair

57°F

14°C

Humidity 67%
Wind Speed SE 6 mph
Barometer 30.00 in
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 29 Sep 2:55 am CDT
Extended Forecast for

Pontoosuc IL

  • Overnight

    Overnight: Partly cloudy, with a low around 56. Southeast wind around 5 mph.

    Low: 56 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 80. South wind 5 to 10 mph.

    High: 80 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers, mainly after 4am. Increasing clouds, with a low around 68. South wind around 10 mph.

    Low: 68 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers and thunderstorms likely before 1pm, then a chance of showers. Mostly cloudy, with a high near 78. South wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 78 °F

    Showers
    Likely then
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers after 1am. Mostly cloudy, with a low around 70.

    Low: 70 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: Showers before 1pm, then showers and possibly a thunderstorm between 1pm and 4pm, then showers after 4pm. High near 75. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

    High: 75 °F

    Showers

  • Thursday Night

    Thursday Night: Showers. Low around 61. Chance of precipitation is 80%.

    Low: 61 °F

    Showers

  • Friday

    Friday: A 40 percent chance of showers before 1pm. Mostly cloudy, with a high near 68.

    High: 68 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 56. Southeast wind around 5 mph.
Tuesday
Mostly sunny, with a high near 80. South wind 5 to 10 mph.
Tuesday Night
A 30 percent chance of showers, mainly after 4am. Increasing clouds, with a low around 68. South wind around 10 mph.
Wednesday
Showers and thunderstorms likely before 1pm, then a chance of showers. Mostly cloudy, with a high near 78. South wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
A 50 percent chance of showers after 1am. Mostly cloudy, with a low around 70.
Thursday
Showers before 1pm, then showers and possibly a thunderstorm between 1pm and 4pm, then showers after 4pm. High near 75. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Thursday Night
Showers. Low around 61. Chance of precipitation is 80%.
Friday
A 40 percent chance of showers before 1pm. Mostly cloudy, with a high near 68.
Friday Night
Partly cloudy, with a low around 55.
Saturday
Mostly sunny, with a high near 68.
Saturday Night
Partly cloudy, with a low around 56.
Sunday
Sunny, with a high near 69.
Sunday Night
Mostly clear, with a low around 52.
Monday
Sunny, with a high near 67.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Pontoosuc IL
 40.63°N 91.21°W (Elev. 531 ft)
Last Update:
1:26 am CDT Sep 29, 2026
Forecast Valid:
3am CDT Sep 29, 2026-6pm CDT Oct 5, 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