Arizona’s Heat Deaths Aren’t a Weather Story. They’re a Meth Story With the AC Turned Off.

Phoenix has spent the last week north of 110°F. Somewhere in that heat right now, someone’s core body temperature is climbing past what their brain can register — not from carelessness, but because the drug in their system has quietly disabled the alarm that’s supposed to warn them.

Arizona’s overdose death rate has overtaken West Virginia’s for the first time in decades, and KJZZ reported August 4 that Arizona and New Mexico now rank among the highest overdose-rate states in the country. Dr. Rebecca Sunenshine, a Maricopa County public health official, told KJZZ the driver isn’t just the thermometer — it’s methamphetamine, a stimulant that revs up heart rate and metabolism while disabling the internal system that’s supposed to tell you when you’re overheating and make you sweat, seek shade, or stop moving — what doctors call thermoregulation.

Arizona’s heat crisis is a methamphetamine crisis that happens to peak in July.

The state that’s losing while the country wins

The national story right now is genuinely good: overdose deaths fell nearly 14% in 2025, the third straight annual decline, according to CDC data released in May. Arizona is not part of that story. The same CDC release named Arizona, alongside New Mexico and Colorado, as states where deaths rose 10% or more against the national grain. Statewide, deaths climbed from 1,651 in 2024 toward an estimated 2,200 in 2025. Maricopa County’s own dashboard shows the same climb up close — 2,069 overdoses in 2024 to 2,406 in 2025, with methamphetamine implicated in 67% of fatal overdoses and fentanyl in 59%, 85% involving more than one drug at once. Sunenshine’s math on heat deaths specifically is stark: about half involve substances, and 80% of those involve methamphetamine, with nearly half of those also carrying fentanyl.

What the heat actually does once meth is already working against you

Here’s the part that doesn’t make it into a headline: your body sweats because a part of your brain is monitoring your internal temperature and sounding an alarm when it climbs. Methamphetamine interferes with that exact monitoring system, on top of raising your metabolic rate — meaning you’re generating more heat internally while losing your ability to notice it. If you’re outside in 110-degree heat, unhoused or between housing, using meth, sitting in a car or on a sidewalk with no shade, your body can be in genuine danger before you feel anything is wrong. Add powdered fentanyl — increasingly potent and increasingly mixed in, per KJZZ’s reporting — and you’ve stacked a respiratory depressant on top of a drug that’s actively working against your survival instincts.

The money left in March, right when the trend turned

Arizona was notified in March that the federal money that funds the bulk of the state’s non-Medicaid addiction prevention and treatment work — the Substance Use Prevention, Treatment and Recovery Services block grant and the Mental Health Block Grant — was terminated, according to AHCCCS. Nobody’s claiming that single decision caused a death rate that was already climbing. But the timing is not subtle: the exact months Arizona’s numbers diverged from the rest of the country are the exact months its response lost federal funding.

Naloxone is still free and still stocked at Maricopa County cooling centers, and those centers are still open. That much hasn’t been cut. What’s been cut is the funding stream that was supposed to shrink the number of people outside in the first place — which means the state is now running the same heat, the same meth supply, and a thinner safety net than it had in June.