Extreme heat caused an estimated 50,391 deaths across European cities during the summer of 2026, making it the deadliest summer for heat-related mortality in more than two decades. Scientists estimate that nearly two-thirds of the deaths were attributable to human-induced climate change, with elderly people, those suffering from chronic illnesses and socially isolated residents facing the greatest risks.
Europe records its deadliest summer heat
The findings, published on 23 October in the scientific journal Nature Health, were produced by researchers from Imperial College London and the London School of Hygiene & Tropical Medicine.
The researchers examined temperatures and heat-related mortality across 854 urban areas in 30 European countries between June and August.
They estimated that 32,619 deaths were attributable to additional warming caused by human activity, primarily greenhouse gas emissions from fossil fuels.
The total estimated death toll was 71% higher than in 2022, previously the deadliest summer in the study’s historical comparison.
Southern Europe suffers the greatest losses
Italy recorded the highest estimated number of heat-related deaths, at 13,303, followed by France with 7,268 and Spain with 6,824.
Germany registered approximately 6,340 deaths, while the United Kingdom recorded 4,354.
Mortality rates were particularly severe in Malta, Italy and Hungary, while Naples emerged as one of the hardest-hit cities.
The impact extended into northern Europe, where buildings, infrastructure and public services are often poorly adapted to prolonged extreme temperatures.
Poverty and isolation increase vulnerability
Scientists warned that the human consequences of extreme heat extend far beyond temperature measurements.
Elderly residents living alone, people with underlying medical conditions and low-income households face particularly serious risks.
High daytime temperatures place additional strain on the heart and respiratory system, while unusually warm nights prevent the body from recovering.
People unable to afford air conditioning or adequate ventilation are especially vulnerable.
Researchers estimated that almost half of the victims were aged over 85, although approximately 6,000 deaths occurred among people younger than 65.
Climate change intensifies the danger
One particularly severe heatwave between 17 June and 1 July accounted for nearly one-third of the estimated summer mortality.
During that period, temperatures averaged approximately 5.3°C above historical norms across the affected areas.
Scientists concluded that climate change has substantially increased Europe’s exposure to deadly heat.
The continent is warming approximately twice as quickly as the global average.
European cities face an urgent challenge
Researchers emphasised that the figures represent statistical estimates rather than individually confirmed causes of death.
The analysis covered urban areas representing approximately 40% of the population in the countries studied, meaning the wider European impact remains uncertain.
Scientists are calling for more green spaces, accessible cooling facilities, improved housing and stronger public-health warning systems.
The findings underline an increasingly urgent reality: extreme heat is becoming one of Europe’s most serious public-health threats, with the greatest burden falling on those least able to protect themselves.
NewsHub Finance | Europe / Climate & Environment | 24 October 2026
Extreme heat caused an estimated 50,391 deaths across European cities during the summer of 2026, making it the deadliest summer for heat-related mortality in more than two decades. Scientists estimate that nearly two-thirds of the deaths were attributable to human-induced climate change, with elderly people, those suffering from chronic illnesses and socially isolated residents facing the greatest risks.
Recent Comments