A dangerous stretch of summer heat is expected to impact nearly all of Iowa beginning this weekend, prompting the National Weather Service to issue an Extreme Heat Watch for much of the state. Some areas of western Iowa will also experience a Heat Advisory beginning Saturday before even more dangerous conditions arrive Sunday and continue through Monday.
Dangerous Heat Building Across Iowa
Temperatures this weekend will combine with high humidity to create heat index values well above the actual air temperature. During the peak of the event, many communities could experience feels-like temperatures between 105 and 110 degrees, with some locations potentially exceeding that threshold.
Unlike many summer heat events, this one is expected to last for several days. Overnight temperatures will remain unusually warm, providing little opportunity for people, pets, and buildings to cool down before the next day begins.
Heat Advisory vs. Extreme Heat Watch
Residents across the western half of Iowa will first be under a Heat Advisory from Saturday afternoon through Sunday morning, where heat index values around 105 degrees or higher are expected.
Beginning Sunday afternoon, the threat increases substantially as an Extreme Heat Watch goes into effect for nearly all of Iowa through Monday evening. This means confidence is growing that dangerously hot conditions capable of producing widespread heat-related illnesses may develop.
If forecast confidence continues to increase, some areas could be upgraded to an Extreme Heat Warning.
Why This Heat Event Is Concerning
Heat is consistently one of the deadliest weather hazards in the United States. While tornadoes and severe thunderstorms often receive the most attention, prolonged periods of extreme heat can lead to serious illness or death, especially when temperatures remain elevated overnight.
Those most at risk include:
- Older adults
- Young children
- People with chronic medical conditions
- Outdoor workers
- Athletes and anyone participating in prolonged outdoor activities
- Individuals without access to air conditioning
The risk increases significantly when the body cannot cool itself overnight after consecutive days of extreme heat.
How to Stay Safe
If you live in Iowa, now is the time to prepare for the hottest stretch of weather so far this summer.
Safety recommendations include:
- Drink plenty of water throughout the day, even if you don’t feel thirsty.
- Limit outdoor activities during the hottest part of the afternoon.
- Wear lightweight, loose-fitting clothing.
- Take frequent breaks in air-conditioned buildings.
- Check on elderly family members, neighbors, and anyone who may be vulnerable.
- Never leave children or pets inside a parked vehicle, even for a few minutes, as vehicle temperatures can become life-threatening very quickly.
If you begin experiencing symptoms such as dizziness, confusion, nausea, excessive sweating, or loss of consciousness, seek medical attention immediately.
Stay Weather Aware
Forecast details may continue to change over the next couple of days. Additional heat headlines, including possible upgrades to Extreme Heat Warnings, could be issued if confidence increases in even more dangerous conditions.
The Iowa Storm Chasing Network and IowaWeather.com will continue monitoring this developing heat event and provide updates on forecast changes, safety information, and any additional watches or warnings issued by the National Weather Service.
As always, stay hydrated, take the heat seriously, and continue checking back with IowaWeather.com for the latest forecast updates.