The NPS recommends avoiding hiking the Grand Canyon's inner trails between 10 a.m. and 4 p.m., when temperatures are at their peak. Temperatures in the inner canyon can reach over 120 degrees Fahrenheit in the shade, creating "extremely hazardous conditions for hikers," the NPS said.

A 67-year-old Texas man died Tuesday at the Grand Canyon after abandoning an attempt to hike down to the Colorado River. He turned around and began ascending toward the rim before he was found, accord

After a 67-year-old hiker dies in the Grand Canyon, authorities warns of heat-related illness due to daytime temperatures in excess of 120°F