PHOENIX — Maricopa County health officials have confirmed the first heat-related death of 2026, an older adult male whose passing serves as a grim annual marker that the desert Southwest's deadliest season has officially begun. The announcement came in April, following a historic March heatwave that sent multiple days above 100°F — a jarring early signal in a region where triple-digit temperatures typically don't arrive until late May or June.
Then, in the second week of May, the National Weather Service issued a formal Extreme Heat Warning for the entire Phoenix metro area, with forecasted highs of 104°F on Saturday, 106°F on Sunday, and 108°F on Monday, May 11–13, 2026. That event affected more than 2 million people and triggered immediate activation of emergency protocols: trail closures at Camelback Mountain and Piestewa Peak between 8 a.m. and 5 p.m., expanded cooling center hours across Phoenix, Glendale, Chandler, Mesa, and Tempe, and emergency public health messaging urging residents to hydrate constantly and seek air-conditioned shelter.
