Extreme Heat Warning Issued for Iowa

July 28, 2025 – Iowa is set to endure one of the most intense heat events of the summer on Monday, July 28, 2025, as multiple Extreme Heat Warnings and Heat Advisories have been issued across nearly the entire state. The National Weather Service warns that heat index values could soar as high as 115°F in many areas, creating life-threatening conditions, especially for vulnerable populations and those working or spending extended time outdoors.

What Alerts Are in Effect?

Extreme Heat Warning

• Heat Index: 110°F to 115°F
• When: Monday, July 28 from 12:00 PM to 8:00 PM CDT
• Where: Much of central, southern, and western Iowa, including:
  • Des Moines, Ames, Fort Dodge, Carroll, Marshalltown, Indianola, Creston, Ottumwa, Council Bluffs, and Sioux City

Heat Advisory

• Heat Index: 100°F to 110°F
• When: Monday, July 28 from 12:00 PM to 8:00 PM CDT
• Where: Northern and eastern Iowa, including:
  • Mason City, Waterloo, Dubuque, Iowa City, Cedar Rapids, Davenport, Decorah

Areas Impacted Across Iowa

This dangerous heat will not be isolated. Nearly all of Iowa will be affected, from Sioux City in the west to Keokuk in the southeast, and from Decorah in the north to the Missouri border in the south. These heat alerts extend beyond Iowa as well, impacting surrounding states including Nebraska, Missouri, Illinois, Minnesota, and South Dakota. In many regions, this marks the second day of dangerously hot weather, with only limited relief overnight due to high humidity and elevated low temperatures.

Why This Heat Is Dangerous

Extreme heat is more than just uncomfortable — it’s a serious public health threat. When temperatures rise and humidity climbs, the human body struggles to cool itself, increasing the risk of heat-related illnesses. Heat exhaustion can develop quickly and is marked by symptoms such as heavy sweating, weakness, dizziness, nausea, and fainting. If not treated, heat exhaustion can lead to heat stroke, which is a medical emergency. Heat stroke symptoms include confusion, a lack of sweating despite high heat, a rapid pulse, and loss of consciousness. If you or someone else shows signs of heat stroke, seek emergency medical assistance immediately by calling 911.

What You Should Do

The National Weather Service advises the following precautions:

• Stay hydrated – Drink plenty of water throughout the day
• Seek air conditioning – Spend time in cool, indoor spaces whenever possible
• Avoid strenuous activity – Especially during the heat of the day
• Dress appropriately – Lightweight, light-colored, and loose-fitting clothing
• Check on others – Particularly elderly relatives and neighbors
• Never leave children or pets in cars – Temperatures can become fatal in minutes

For those who must work outdoors, OSHA recommends taking frequent breaks in shaded or air-conditioned areas. Employers should ensure their workers are protected.

Local Cooling Centers & Safety Resources

If you do not have access to air conditioning, check with local authorities about cooling centers in your area. Many community centers, libraries, and city buildings may offer temporary relief during periods of excessive heat.

This level of heat can be deadly. Take it seriously. Make plans now to stay safe, cool, and informed as Iowa heads into one of the hottest stretches of the summer.

Stay tuned to iowaweather.com and local news outlets for updates and safety information throughout the weekend.