Arizona’s National Weather Service has issued a heat advisory that will span from Saturday through Tuesday, warning residents across multiple counties of extreme temperatures that could reach 110°F with heat indices over 115°F. the advisory covers the Yuma/Martinez Lake area, the Lower Colorado River Valley, and a wide swath of the Mogollon Rim, Grand Canyon Country, and the White Mountains.

Yuma’s 110°F Peak: A Saturday Extreme

From 9:00 AM to 11:00 PM Saturday, the Yuma/Martinez Lake and Lower Colorado River Valley are expected to hit 110°F, with a heat index of 115°F. According to the National Weather Service, ressidents in these areas are urged to stay indoors, stay hydrated, and avoid strenuous activity. The advisory will lapse at 11:00 PM Saturday.

Sunday’s Expansion to the Grand Canyon and Coconino Plateaus

On Sunday, the heat advisory expands to cover the Little Colorado River Valley in Navajo County, Grand Canyon Country, and the Coconino Plateau , among others. Temperatures are forecasted at 108°F with a heat index of 113°F, and the warning remains in effect until 8:00 PM. The advisory also reaches the Northeast Plateaus and Mesas, extending to 9:00 PM.

Monday‑Tuesday: The Mogollon Rim and White Mountains Stay Hot

Monday and Tuesday’s advisory will affect the Western Mogollon Rim, Oak Creek and Sycamore Canyons,and the White Mountains, with temperatures again pegged at 108°F and a heat index of 113°F. the National Weather Service advises residents to keep informed and plan activities around the heat advisory, which will end at 8:00 PM on Tuesday.

What Residents Must Do: Precautions and Planning

Across all affected regions, the National Weather Service repeatedly stresses the importance of staying indoors, drinking plenty of water, and avoiding strenuous activities during peak heat hours. Residents are also encouraged to check forecasts regularly and adjust plans accordingly. The advisory remains active until the stated times each day, with the agency monitoring conditions and issuing updates as needed.

Who Is Most at Risk? Vulnerable Populations and Outdoor Workers

While the advisory covers a broad geographic area, the most vulnerable groups—elderly individuals, outdoor workers, and those with pre‑existing health conditions—are at heightened risk. The National Weather Service’s repeated warnings underscore the need for community outreach and emergency preparedness in these high‑temperature zones.