Excessive Rainfall Potential for the Southeast; Heat Expands for Center of the Nation; Critical Fire Weather for Pacific Northwest

Flash flooding threatens areas from the Tennessee Valley to the Carolinas as storms repeat along a stalled front. Monsoonal storms may trigger flooding in the Southwest. Dangerous heat expands across the Desert Southwest, Plains, mid-Mississippi Valley and Southern Tier. Critical fire weather for interior Pacific Northwest. Cooler, drier air brings brief relief to the Great Lakes and Northeast. Read More >

Current conditions at

Fort Madison Municipal Airport (KFSW)

Lat: 40.66°NLon: 91.33°WElev: 719ft.

Overcast

68°F

20°C

Humidity 88%
Wind Speed SE 12 mph
Barometer 30.03 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 24 Jul 11:55 pm CDT
Extended Forecast for

Donnellson IA

Extreme Heat Watch July 26, 12:00pm until July 27, 10:00pm
Click here for hazard details and duration
Extreme Heat Watch
  • Overnight

    Overnight: A 30 percent chance of showers, mainly between 1am and 2am.  Mostly cloudy, with a low around 66. South wind around 5 mph.

    Low: 66 °F

    Chance
    Showers

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 89. South wind around 5 mph becoming calm.

    High: 89 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 72. Calm wind becoming south around 5 mph.

    Low: 72 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 93. Heat index values as high as 105. Southwest wind around 5 mph.

    High: 93 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 76.

    Low: 76 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of showers, mainly between 1am and 2am. Mostly cloudy, with a low around 66. South wind around 5 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 89. South wind around 5 mph becoming calm.
Saturday Night
Partly cloudy, with a low around 72. Calm wind becoming south around 5 mph.
Sunday
Mostly sunny, with a high near 93. Heat index values as high as 105. Southwest wind around 5 mph.
Sunday Night
Partly cloudy, with a low around 76.
Monday
Sunny, with a high near 94.
Monday Night
Mostly clear, with a low around 73.
Tuesday
Sunny, with a high near 93.
Tuesday Night
Partly cloudy, with a low around 70.
Wednesday
Sunny, with a high near 91.
Wednesday Night
Partly cloudy, with a low around 70.
Thursday
Mostly sunny, with a high near 90.
Thursday Night
Partly cloudy, with a low around 70.
Friday
Sunny, with a high near 89.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Donnellson IA
 40.64°N 91.56°W (Elev. 705 ft)
9:16 pm CDT Jul 24, 2026
12am CDT Jul 25, 2026-6pm CDT Jul 31, 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