Europe heat deaths hit record 50,000 in cities this summer, scientists estimate
Heat killed an estimated 50,000 people in European cities between June and August 2026 - the worst summer on record - and researchers attribute about two in three of the deaths to human-caused climate change.
Europe heat deaths hit record 50,000 in cities this summer, scientists estimate
Heat-related mortality in Europe reached its highest recorded level this summer, with an estimated 50,000 deaths in European cities between June and August 2026, according to new research. Scientists attribute two in every three of those deaths - roughly 32,000 extra lives - to human-caused climate change.
How the estimate was made
The figures were modelled using historical relationships between heat and health in 854 cities, and the researchers describe this summer as the worst on record - nearly twice as deadly as the next two most dangerous years. The modelling combined established heat-mortality relationships with 2026 temperature data to produce rapid estimates; the death tolls for individual countries differ from what national public health agencies have calculated.
Because the studied cities account for about 40% of the European population, the toll cannot easily be extrapolated to towns and villages. Malcolm Mistry, a co-author of the study at the London School of Hygiene & Tropical Medicine, called the numbers staggering and said the proportion linked to warming was the greater worry.
"But perhaps what is even more alarming is the proportion of these deaths that we attribute to anthropogenic climate change."
That climate-driven share has itself been rising, from about 40% of heat deaths at the start of the century to 65% this summer. David García-García of the Carlos III health institute in Madrid, who was not involved in the study, called it valuable but noted the limitation: "these are estimates based on observed temperatures and epidemiological models, which do not incorporate actual data on deaths".
Where the toll was heaviest
People succumbed to heat at the highest rates in Malta, Italy and Hungary, while the largest absolute death tolls were recorded in Italy, France, Spain, Germany and the UK. In Naples, the hardest-hit city on the continent, 815 people per million died from the heat in age-standardised estimates.
- Highest per-capita heat death rates: Malta, Italy and Hungary
- Largest absolute tolls: Italy, France, Spain, Germany and the UK
- Hardest-hit city: Naples, at 815 heat deaths per million people
- UK: scientists estimated 4,354 heat deaths this summer
Katie White, the UK's climate transition minister, responded to the national estimate: "These shocking figures represent thousands of families who have lost a loved one this summer due to the climate crisis".
On the ground in Naples
The study's city-level figures match what emergency staff say they saw. Mario Guarino, an emergency doctor at Ospedale CTO in Naples, witnessed a 15% increase in emergency room visits during the hottest weeks. He described the "defining characteristic" of the period as the complexity of health problems exacerbated by heat, with loneliness and poverty compounding the crisis.
"The real epidemic these days is loneliness."
Guarino said many elderly people cannot afford air conditioning, or avoid using it because of electricity costs. Across the continent, age shaped the toll: people over 85 made up almost half of the deaths, though 833 people aged 20 to 44 were also thought to have died from heat.
A summer of record heat stress
The deaths came during a summer the EU's climate monitoring service described as the worst for heat in western Europe on record, with more than half the continent seared by "very strong" heat stress that felt hotter than 38C. Eastern Europe's slightly less punishing temperatures brought the continental average to its third-hottest level on record.
The background to that intensity is a long-term trend: greenhouse gases have warmed Europe about twice as fast as the global average, and scientists expect rising heat deaths to outweigh falling cold deaths.
Doctors have urged governments to respond on several fronts: burn fewer fossil fuels, strengthen health systems, green cities, expand air conditioning, and encourage hydration, shade and checking on vulnerable neighbours. For now, the 50,000 figure stands as a modelled estimate, awaiting actual 2026 death data.
