Heat Expands for Center of the Nation; Severe Thunderstorms for Plains and Upper Midwest

Dangerous heat expands across the Desert Southwest, Plains, Mississippi Valley and Midwest. Critical fire weather for portions of the Intermountain West. Risk for severe thunderstorms and flash flooding across the Upper Midwest/Great Lakes, Ohio Valley, and portions of the mid-Atlantic. Active monsoonal moisture fuels thunderstorms over the Southwest. Hurricane Fausto in the Pacific, should weaken Read More >

Current conditions at

Fort Madison Municipal Airport (KFSW)

Lat: 40.66°NLon: 91.33°WElev: 719ft.

Fog/Mist

77°F

25°C

Humidity 100%
Wind Speed SE 5 mph
Barometer 29.91 in
Dewpoint 77°F (25°C)
Visibility 1.75 mi
Heat Index78°F (26°C)
Last update 26 Jul 7:55 am CDT
Extended Forecast for

Denmark IA

Extreme Heat Watch July 26, 09:00pm until July 27, 10:00pm
Extreme Heat Warning July 26, 11:00am until July 26, 09:00pm
Click here for hazard details and duration
Extreme Heat Watch
Extreme Heat Warning
  • Today

    Today: A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 11am.  Areas of fog before 10am.  Otherwise, cloudy, then gradually becoming mostly sunny and hot, with a high near 95. Heat index values as high as 113. South wind around 5 mph becoming west in the afternoon.  Chance of precipitation is 20%.

    High: 95 °F

    Slight Chance
    T-storms and
    Areas Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 77. Southwest wind around 5 mph.

    Low: 77 °F

    Partly Cloudy

  • Monday

    Monday: Sunny and hot, with a high near 96. Heat index values as high as 110. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 96 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 74. West wind 5 to 10 mph becoming north after midnight.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

Detailed Forecast

Today
A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 11am. Areas of fog before 10am. Otherwise, cloudy, then gradually becoming mostly sunny and hot, with a high near 95. Heat index values as high as 113. South wind around 5 mph becoming west in the afternoon. Chance of precipitation is 20%.
Tonight
Partly cloudy, with a low around 77. Southwest wind around 5 mph.
Monday
Sunny and hot, with a high near 96. Heat index values as high as 110. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 74. West wind 5 to 10 mph becoming north after midnight.
Tuesday
Mostly sunny, with a high near 89.
Tuesday Night
Mostly clear, with a low around 67.
Wednesday
Sunny, with a high near 88.
Wednesday Night
Mostly clear, with a low around 65.
Thursday
Mostly sunny, with a high near 88.
Thursday Night
Mostly cloudy, with a low around 68.
Friday
A 30 percent chance of showers. Mostly sunny, with a high near 84.
Friday Night
Partly cloudy, with a low around 66.
Saturday
Mostly sunny, with a high near 86.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Denmark IA
 40.74°N 91.32°W (Elev. 699 ft)
8:02 am CDT Jul 26, 2026
8am CDT Jul 26, 2026-6pm CDT Aug 1, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database