Three hikers died from heat-related illness at Grand Canyon National Park in June 2026. A 72-year-old man died on June 12 along the South Kaibab Trail. A 67-year-old man and a 68-year-old woman died on the North Kaibab Trail on June 16. The U.S. National Park Service advised visitors to avoid hiking in the middle of the day due to extreme heat. Rescue efforts occurred prior to the deaths. According to gdelt, the U.S. National Weather Service issued an extreme heat watch for Grand Canyon National Park from midday Monday through Tuesday, forecasting temperatures reaching or exceeding 110 degrees Fahrenheit at Phantom Ranch. According to hindustantimes, temperatures at the rim of the Grand Canyon are often 20-25 degrees cooler than at the bottom. According to scrippsnews.com, daytime temperatures at Grand Canyon can exceed 109 degrees Fahrenheit.