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Forecasters are sounding the alarm as a brutal heatwave descends on the Grand Canyon, with lower sections of the iconic national park expected to bake under temperatures as high as 112°F (44.4°C) starting Monday — creating potentially lethal conditions for unprepared visitors.

The National Weather Service has issued an Extreme Heat Watch for areas below 4,000 feet, warning of “dangerously hot conditions” from 10 a.m. Monday through 7 p.m. Tuesday. Daytime highs could reach 111°F at Phantom Ranch and 97°F at Havasupai Gardens, with officials stressing that most people will be at serious risk of heat-related illness without proper hydration and cooling.

This alert comes just days after three hikers died in separate heat-related incidents within the park, including a 72-year-old man on the South Kaibab Trail and a 67-year-old man and 68-year-old woman on the North Kaibab Trail. Despite rapid responses and aerial support, all three were found deceased.

The Grand Canyon is one of the most breathtaking natural wonders on Earth, but it can also be one of the most unforgiving. What looks like a stunning hike can quickly become a life-threatening ordeal when extreme heat combines with steep terrain and limited shade. Park officials are now strongly advising visitors to avoid the inner canyon during peak hours (10 a.m. to 4 p.m.) and to rethink strenuous activity altogether during this dangerous stretch.

This situation highlights a growing challenge for America’s national parks as climate patterns shift and extreme weather events become more frequent. With the U.S. currently co-hosting the 2026 FIFA World Cup and recent matches already raising concerns about heat safety, this week’s Grand Canyon warning serves as a broader reminder of how rising temperatures are reshaping outdoor recreation and public safety across the country.

For anyone planning a trip to this natural treasure, the message from authorities is clear: respect the heat, or it may claim you next.