Study estimates 50,000 summer heat deaths in European cities

Researchers estimate that heat caused about 50,000 deaths across European cities during June–August 2026, with nearly two-thirds attributable to human-caused warming, according to findings reported by the Associated Press on October 22. Separately, The Straits Times reported that extreme heat reduced European Union economic output from April through September.³²

An estimated toll, not a death count

The analysis put the number of heat-related deaths at 50,391 across 854 cities, including 32,619 attributed to human-caused warming, according to AP. The Guardian and The Straits Times described the estimated urban toll as the highest recorded. The Straits Times reported that the study covered 30 countries, encompassing the EU, Britain, Switzerland and Norway.¹²³

The figures were calculated using observed temperatures and epidemiological models rather than death records from summer 2026, The Guardian reported. Researchers used historical relationships between heat and health to estimate mortality. AP said the cities studied represent about 40% of Europe's population; The Guardian cautioned that the results cannot readily be extended to the entire European population.¹³

AP described the estimate as conservative because it excludes a deadly heatwave in May. Identifying heat-related deaths is also difficult because high temperatures can worsen existing illnesses without appearing as the recorded cause of death, according to The Straits Times. Intensive-care consultant Andrew Hartle told the newspaper: “A post-mortem won’t tell you whether somebody was hot or not.”²³

Age and geography

People older than 85 accounted for almost half of the estimated deaths, The Guardian reported. The study also estimated 833 deaths among people aged 20 to 44. According to the newspaper, the share attributed to climate change reached 65% in summer 2026, compared with about 40% at the beginning of the century.¹

The highest estimated death rates were in Malta, Italy and Hungary, while Italy, France, Spain, Germany and the UK had the largest absolute tolls, according to The Guardian. It reported an estimated 4,354 deaths in the UK and a rate of 815 deaths per million people in Naples.¹

Economic losses alongside mortality

The Straits Times reported that extreme heat reduced EU GDP by roughly 0.17% between April and September, a loss two-and-a-half times the average for the same period over the preceding decade. It further reported that second-quarter GDP was reduced by heat by 0.2 percentage points in France and by 0.1% in Germany.²

The newspaper reported that western Europe's average summer temperatures were nearly 3°C above the 1991–2020 summer average, with some days as much as 12°C higher. It also described damage and disruption to essential infrastructure across Europe during the summer.²