Summer Heat Wave Killed More Than 50,000 People in Europe, New Analysis Finds

Europe's summer heat wave this year caused an estimated 50,391 deaths, making it the deadliest the continent has recorded, according to a new analysis. CNN reported the findings on Friday, citing two peer-reviewed papers published in the journal Nature Health.

The researchers attributed more than half of those deaths to climate change driven by fossil fuel pollution. They found that temperatures ran 2.9 degrees Celsius above the 1991-2020 average, and that some areas periodically saw readings more than 12 degrees Celsius above normal.

The papers concluded that the 2026 summer was "likely to have been the most dangerously hot summer that Europe has experienced to date." Southern and western Europe were hit hardest, but CNN noted that the United Kingdom and other regions usually known for cooler weather also recorded thousands of heat-related deaths.

To reach the figures, the team examined 854 European cities across 30 countries. They compared the temperatures actually recorded with estimates of what would have occurred without climate change. They then applied the established relationship between high temperatures and daily deaths to model likely heat-related mortality from June to August.

Older people bore the greatest burden, with the highest death rates among those aged 85 and above. Still, more than 800 of the victims were between 20 and 44. The analysis said the toll was substantially higher than in the heat wave summers of 2022 and 2003, and the highest in 26 years. It also found that fossil fuel pollution-driven climate change now accounts for about two-thirds of modern heat-related deaths, compared with around 40% earlier this century.

Clair Barnes, an author of the reports and an extreme weather and climate change researcher at Imperial College London, told CNN that the team could be "quite confident" the summer was likely the worst on record for heat-related mortality across much of Europe. "We're well off-track to limit the worst consequences of climate change, and governments need to realize that without faster action and coordination, things will only get worse," she said. She added that behind the statistics are real people and grieving families.

Raquel Nunes, an associate professor of health and environment at Warwick University who was not involved in the research, described the results as growing evidence of how deadly extreme heat can be. She noted that it is often called a "silent killer" because its effects are not always immediately visible, and said the thousands of deaths among people under 65 were especially alarming.

Lasse Vestergaard, chief physician at the European Mortality Monitoring Network (EuroMOMO), said the Nature Health findings largely matched the network's own. He cautioned, however, that the results should be treated carefully "as they involve several uncertainties and assumptions."

The findings arrive as world leaders prepare to attend the annual United Nations climate talks in Turkey. A UN report released earlier last week warned that the planet has missed its chance to limit global warming to 1.5 degrees Celsius above pre-industrial levels.