Grand Canyon, North Rim
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The NWS warning was in effect for regions of the Grand Canyon below 4,000 feet elevation. Temperatures were forecast to potentially reach 110 degrees at Phantom Ranch and 102 at Havasupai Gardens.
The White Sage Fire, burning in northern Arizona near the destructive Dragon Bravo Fire, continues to grow with evacuations still in place.
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 wildfire has forced the Grand Canyon National Park’s North Rim to close for the rest of the 2025 season and destroyed the lodge located in the park, a historic landmark, the National Park Service said.