Sep 4, 2026 · 15 min
Heat kills thousands more Americans than records show
A new investigation shows heat is even deadlier than we thought
Undercounted heat deaths obscure the scale of a growing public-health threat and make it harder for communities to protect vulnerable residents.
- 1Excess-mortality modeling estimates extreme heat kills roughly 9,000 Americans annually, far above official counts.
- 2Heat often contributes to heart attacks, kidney failure, and other conditions, making its role difficult to record consistently.
- 3Better tracking and protections, including utility-shutoff policies, could help communities measure and reduce heat deaths.
Don't miss
The researchers conclude that roughly 9,000 annual heat deaths is likely still an undercount, not a ceiling.
The brief
Official records suggest heat kills relatively few Americans, but a new investigation finds the true toll is likely closer to 9,000 deaths each year.
Heat is easy to miss on death certificates because it can trigger heart attacks, kidney failure, and other conditions; inconsistent reporting compounds the problem.
Researchers modeled excess deaths across counties, accounting for humidity, medications, acclimatization, temperature thresholds, and delays between exposure and death.
The estimate is probably conservative: more detailed national death data could raise it, but access to that data is still pending.
The episode treats heat as a policy problem, highlighting improved tracking in Arizona counties and proposed protections against utility shutoffs during New York heat waves.
Featuring
Alejandra Salazar
United StatesListen to the full episode and explore every guest, topic, and moment on PodLume.