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By Joe Edwards
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The National Weather Service (NWS) has issued an extreme heat warning for the Grand Canyon as dangerously hot temperatures settle over the region, just weeks after park officials confirmed three heat-related hiker deaths in the inner canyon.
Forecasters warned Monday that temperatures will soar well above average, creating life-threatening conditions for those unprepared for the desert heat.
“Today starts a warming trend with hot daytime temperatures reaching 5-10 degrees above normal, as high as 110° for the inner Grand Canyon,” the NWS Flagstaff forecast office in Arizona said in a social media post Monday. “Moisture starts to return as early as tomorrow with slight chances for an afternoon thunderstorm over the high country.”
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Triple-Digit Heat Below the Rim
The extreme heat warning is in effect from 10 a.m. Monday to 7 p.m. MST Tuesday, encompassing Grand Canyon Country, including Supai, Grand Canyon Village, Tusayan, and the Grand Canyon North Rim.
Meteorologists expect “dangerously hot conditions” below 4,000 feet, with daytime temperatures ranging from 101 degrees at Havasupai Gardens to 112 degrees at Phantom Ranch.
“Most individuals will be at risk for heat-related illnesses without effective cooling or adequate hydration, especially with prolonged outdoor exposure,” the NWS warned.
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Recent Hiker Fatalities
The advisory comes on the heels of a deadly stretch inside the park. According to the National Park Service (NPS), three people died in separate incidents earlier this month after appearing to succumb to heat-related illness while hiking in the Grand Canyon’s inner canyon.
The fatalities included a 72-year-old man on the South Kaibab Trail on June 12, and a 67-year-old man and 68-year-old woman on the North Kaibab Trail on June 16.
The NPS said all three individuals were found deceased when responders arrived, despite rapid response and aerial support, and were later taken to the Coconino County Medical Examiner’s Office.
Park officials have repeatedly urged visitors to take summer conditions seriously, noting how rapidly the environment can turn hostile.
“Hiking in Grand Canyon can be a challenge for anyone, especially during the heat of summer. The recent increase in heat-related incidents comes as summer temperatures in the Inner Canyon have reached dangerous levels, creating conditions that can quickly overwhelm hikers during the hottest parts of the day,” the agency said in a statement.
Safety Precautions and Emergency Signs
The NWS advised anyone in the area to drink ample fluids, stay in air-conditioned rooms, avoid direct sunlight, and check on neighbors and relatives. Officials also cautioned against leaving children or pets unattended in vehicles, noting that interior car temperatures can reach lethal levels within minutes.
“Take action when you see symptoms of heat exhaustion and heat stroke. Anyone overcome by heat should be moved to a cool and shaded location," the agency said. “Heat stroke is an emergency! Call 911.”
Contact Newsweek editors on this story: John Fitzpatrick and Anthony Murray.
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