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

Heavy Rain and Thunderstorms in the Plains; Tropical Moisture Brings Heavy Rain to Southern California and Southwest

Heavy rain showers and thunderstorms, some severe, will persist across the Plains and Mississippi Valley through Friday. Increasing tropical moisture from the remnants of Mario will bring showers, thunderstorms, and a flash flooding threat across much of southern California into the Desert Southwest through Friday. Read More >

Hazardous Weather Conditions

Current conditions at

Fort Madison Municipal Airport (KFSW)

Lat: 40.66°NLon: 91.33°WElev: 719ft.

Fair

66°F

19°C

Humidity 88%
Wind Speed NW 3 mph
Barometer 30.04 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 17 Sep 11:55 pm CDT
Extended Forecast for

Fort Madison IA

  • Overnight

    Overnight: Partly cloudy, with a low around 64. East wind around 5 mph becoming north.

    Low: 64 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 90. Calm wind becoming south around 5 mph in the morning.

    High: 90 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms before 1am, then a chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 66. South wind around 5 mph becoming west after midnight. Chance of precipitation is 40%.

    Low: 66 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. Southwest wind around 5 mph. Chance of precipitation is 50%.

    High: 81 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers. Partly cloudy, with a low around 64.

    Low: 64 °F

    Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 66.

    Low: 66 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 30 percent chance of showers. Partly sunny, with a high near 84.

    High: 84 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A 40 percent chance of showers. Partly cloudy, with a low around 65.

    Low: 65 °F

    Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 64. East wind around 5 mph becoming north.
Thursday
Mostly sunny, with a high near 90. Calm wind becoming south around 5 mph in the morning.
Thursday Night
A slight chance of showers and thunderstorms before 1am, then a chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 66. South wind around 5 mph becoming west after midnight. Chance of precipitation is 40%.
Friday
A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. Southwest wind around 5 mph. Chance of precipitation is 50%.
Friday Night
A 30 percent chance of showers. Partly cloudy, with a low around 64.
Saturday
Mostly sunny, with a high near 85.
Saturday Night
Mostly cloudy, with a low around 66.
Sunday
A 30 percent chance of showers. Partly sunny, with a high near 84.
Sunday Night
A 40 percent chance of showers. Partly cloudy, with a low around 65.
Monday
A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 83.
Monday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Tuesday
Mostly sunny, with a high near 82.
Tuesday Night
Partly cloudy, with a low around 60.
Wednesday
Sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Fort Madison IA
 40.61°N 91.36°W (Elev. 518 ft)
Last Update:
9:46 pm CDT Sep 17, 2025
Forecast Valid:
12am CDT Sep 18, 2025-6pm CDT Sep 24, 2025
 
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