Researchers from Imperial College London published a scientific analysis in the journal Nature Health estimating that 50,391 people died from heat-related causes in 854 European cities during the summer of 2026. The report, released on Thursday, October 22, 2026, attributes approximately two-thirds of these deaths—more than 32,600 fatalities—to human-induced climate change.
The report identifies the summer of 2026 as western Europe's hottest on record, with average temperatures 2.9 degrees Celsius (5.2 Fahrenheit) above the 1991-2020 norm. Scientists calculated the impact by comparing actual temperatures in 854 cities across 30 European countries with modeled temperatures for a world without climate change. The study found that fossil fuel pollution was responsible for about 40% of heat deaths earlier this century, compared to around two-thirds estimated today.
Southern and western Europe reported the highest mortality rates, though northern regions such as the United Kingdom also recorded thousands of deaths. While the highest death rates occurred among individuals aged 85 or older, the study noted that more than 800 people between the ages of 20 and 44 died from heat-related causes. Lasse Vestergaard of the European Mortality Monitoring Network (EuroMOMO) stated that while the modeled estimates involve uncertainties, they are broadly in line with figures reported to EuroMOMO during the summer.
The researchers conclude that climate change now plays a more pronounced role in heat-related deaths than it did 20 years ago. This shift places additional pressure on national health systems to adapt to what researcher Clair Barnes described as increasingly hot and dangerous summers as long as fossil fuel use continues. The report also highlights that thousands of people under age 65 were affected.
These findings were released days after a United Nations report stated that the goal of limiting global warming to 1.5 degrees Celsius is no longer achievable. The analysis is expected to inform discussions at the annual UN climate talks scheduled to begin in Turkey in the coming weeks. National health authorities in the 30 studied countries are expected to release their own finalized mortality statistics, which scientists use to validate the modeling methods employed in this report. No specific deadline for those government reports was provided.