The National Weather Service (NWS) has issued an extreme heat warning on Monday for parts of Arizona including the Grand Canyon, warning that prolonged outdoor exposure presents health risks due to “dangerously hot conditions.”
Why It Matters
The NWS says that extreme heat warnings are “reserved for only the hottest days of the year,” and are “issued when temperatures are expected to rise to dangerous levels.”
Officials cautioned that without proper cooling and hydration, individuals face a risk of heat-related illnesses, particularly with extended exposure outdoors.
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What To Know
The NWS alert warns of “dangerously hot conditions” below 4,000 feet in the Grand Canyon on Monday, with daytime temperatures ranging from 102 degrees Fahrenheit at Havasupai Gardens, to 114 degrees at Phantom Ranch.
“Day hikers on Bright Angel Trail should descend no farther than 1 1/2 miles from the upper trailhead,” the NWS said.
“Between the hours of 10 a.m. and 4 p.m., hikers should be out of the canyon or at Havasupai Gardens or Bright Angel campgrounds, physical activity is discouraged.”
It said that hikers should carry proper gear such as a wide-brimmed hat, sunscreen, salty snacks, enough water, and an electrolyte mix. It added that increasing calorie intake can help sustain energy levels.
The extreme heat warnings also cover southern Arizona more widely, as well as a neighboring portion of southeastern California, with temperatures up to 116 degrees possible in places.
Elsewhere, heat advisories have been issued for parts of New Mexico and western Texas, where triple-digit temperatures are expected on Monday.
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What People Are Saying
The NWS forecast office in Flagstaff, Arizona, said on X, formerly Twitter, on Saturday: “An Extreme Heat Warning remains in effect through Monday for the Grand Canyon below 4000′. Be sure to exercise enhanced caution with any outdoor activities, especially for individuals who are sensitive to heat.”
The NWS said on X on Wednesday: “During hot and humid weather, your body’s ability to cool itself is challenged in ways you may not expect. When your body heats too rapidly, or when too much fluid or salt is lost through dehydration or sweating, you may experience a heat-related illness. Stay weather-ready by learning the symptoms of extreme heat exposure and the appropriate responses.”
NWS Phoenix said on X on Sunday:”High temperatures will be running 5-10 degrees above normal this week, with the hottest day being today. Temperatures will also be similarly hot on Thursday for south-central and southeastern AZ, following the passage of a dry and weak weather system early week.”
What Happens Next
The extreme heat warning for southern parts of Arizona is set to remain in force until 8 p.m. on Monday evening.
The NWS issues regular forecast updates on its website and social media channels.