It’s been nearly five years since a deadly heat dome gripped the Pacific Northwest. Many hundreds of people died — including 69 in Multnomah County alone — from the extreme heat event that sent the temperature soaring to 116 degrees in Portland and broke other temperature records in the region.

As climate change makes extreme heat events more frequent and longer-lasting, a new Portland State University predicts that heat-related illnesses could double by 2040 across more than 50 of the largest metro areas in the U.S., including Seattle and Portland. The cost of treating heat-related illnesses is also expected to double, according to the study, likely further straining healthcare systems and vulnerable populations.

The study’s authors developed a model integrating multiple variables, including demographic information about age, race and health; climate data; visits to hospitals and emergency rooms for heat-related illnesses; and access to air-conditioning or other cooling infrastructure. The study reveals that cities in the Pacific Northwest could bear an especially high public health burden with their aging populations and lack of cooling infrastructure.

Vivek Shandas is a professor of earth, environment and society at PSU and co-author of the study. He joins us to share more details.

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News Source : https://www.opb.org/article/2026/06/09/heat-related-illness-pacific-northwest/