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

Hazardous Weather Conditions

Current conditions at

Fort Madison Municipal Airport (KFSW)

Lat: 40.66°NLon: 91.33°WElev: 719ft.

Fair

77°F

25°C

Humidity 94%
Wind Speed S 8 mph
Barometer 29.78 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 12 Aug 5:55 am CDT
Extended Forecast for

Fort Madison IA

Heat Advisory August 12, 12:00pm until August 12, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: Occasional showers and thunderstorms, mainly before 1pm. Patchy fog before 8am, then patchy fog after 3pm. High near 88. South wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 88 °F

    T-storms and
    Patchy Fog
    then Chance
    T-storms and
    Patchy Fog

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 4am. Patchy fog. Otherwise, partly cloudy, with a low around 73. East wind around 5 mph.

    Low: 73 °F

    Patchy Fog
    then Chance
    T-storms and
    Patchy Fog

  • Thursday

    Thursday: Showers and thunderstorms likely before 2pm, then a chance of showers between 2pm and 4pm, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 87. Heat index values as high as 100. Southeast wind around 5 mph. Chance of precipitation is 60%.

    High: 87 °F

    Showers
    Likely then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 72. Northeast wind 5 to 10 mph. Chance of precipitation is 70%.

    Low: 72 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Mostly cloudy, with a high near 88. Chance of precipitation is 30%.

    High: 88 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 74.

    Low: 74 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 1am. Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear
    then Chance
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

Detailed Forecast

Today
Occasional showers and thunderstorms, mainly before 1pm. Patchy fog before 8am, then patchy fog after 3pm. High near 88. South wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
A 30 percent chance of showers and thunderstorms, mainly after 4am. Patchy fog. Otherwise, partly cloudy, with a low around 73. East wind around 5 mph.
Thursday
Showers and thunderstorms likely before 2pm, then a chance of showers between 2pm and 4pm, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 87. Heat index values as high as 100. Southeast wind around 5 mph. Chance of precipitation is 60%.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 72. Northeast wind 5 to 10 mph. Chance of precipitation is 70%.
Friday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Mostly cloudy, with a high near 88. Chance of precipitation is 30%.
Friday Night
A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 74.
Saturday
Mostly sunny, with a high near 91.
Saturday Night
A 30 percent chance of showers after 1am. Mostly clear, with a low around 74.
Sunday
Mostly sunny, with a high near 86.
Sunday Night
Partly cloudy, with a low around 69.
Monday
Mostly sunny, with a high near 82.
Monday Night
Partly cloudy, with a low around 67.
Tuesday
Mostly sunny, with a high near 83.
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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:
5:46 am CDT Aug 12, 2026
Forecast Valid:
6am CDT Aug 12, 2026-6pm CDT Aug 18, 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