Researchers estimate over 50,000 urban heat deaths in Europe in 2026
The study covers about 40% of the population across 30 countries, not all European heat deaths. Its authors call for targeted protection against extreme heat.
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The study covers about 40% of the population across 30 countries, not all European heat deaths. Its authors call for targeted protection against extreme heat.
Researchers at Imperial College London and the London School of Hygiene & Tropical Medicine estimate more than 50,000 heat-related deaths across 854 European urban areas during summer 2026, including more than 32,000 attributable to human-caused warming. Additional age and city estimates reported by the Guardian on 23 October come with an important qualification from an independent researcher: the analysis does not use actual death data from that summer.
The findings extend a study of summers from 2000 to 2025 published in Nature Health. The analyses estimate how much heat-related mortality is attributable to human-caused warming, driven primarily by burning fossil fuels.
The Guardian reports that people over 85 accounted for almost half of the modelled deaths. Inside Climate News’s 22 October report put that share at more than half, so the two accounts differ on the proportion.
| Age group | Estimated deaths |
|---|---|
| 20–44 | 833 |
| Under 65 | 6,000 |
Naples had the highest estimated heat-mortality rate among the cities studied, according to the Guardian: 815 deaths per million people after age standardisation. That adjustment makes populations with different age profiles comparable; the figure is a modelled rate, not a count of recorded deaths.
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The researchers compared observed summer temperatures with modelled temperatures in a climate without human-caused warming. They combined that comparison with historical relationships between temperature and death rates to estimate monthly heat mortality.
David García-García, a researcher in the mortality-monitoring system at the Carlos III health institute in Madrid, was not involved in the study. He called it a valuable contribution that allows comparisons across Europe, but stressed that its models use observed temperatures and established relationships between heat and mortality—not actual data on deaths during summer 2026. The Guardian also notes that the country estimates differ from national public-health agencies’ calculations, which use their own methods.
The study covered urban areas in 30 countries, representing about 40% of the population. Its authors cautioned that the estimates cannot easily be extended to calculate a total including towns and villages.
Across the urban areas studied, the analyses estimated a growing share of heat-related deaths attributable to human-caused warming.
| Summer | Share |
|---|---|
| 2003 | 42% |
| 2022 | 59% |
| 2026 | 65% |
Repeated heat waves swept across Europe from late May through August 2026. The researchers estimated that the late-June heat wave accounted for about a third of the summer’s heat-related deaths.
Inside Climate News reported a modelled United Kingdom death toll of 4,500. The Guardian gives a modelled UK estimate of 4,354.
Andrew Hartle, an anesthesia professor at Imperial College London and an intensive-care consultant at Imperial College Healthcare NHS Trust, said heat pushed hospital demand to levels usually associated with a severe winter flu season. Summer is normally the quietest period for health emergencies, he said. Patients overheated while receiving treatment for other conditions, and high temperatures increased the risk of medical equipment failure.
Clair Barnes, lead author of both papers, called for targeted measures to protect the most vulnerable people. Doctors quoted by the Guardian urged governments to burn fewer fossil fuels, strengthen health systems and cool cities, alongside encouraging people to drink water, seek shade and check on vulnerable neighbours and relatives.
The paper applying the analysis to summer 2026 has been accepted for publication and awaits publication.
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