Heat-related deaths in 2026 reach record levels

The summer of 2026 saw 50,391 heat-related deaths across 854 European cities, a number twice as high as the totals from the heatwaves of 2003 and 2022. This figure comes from a study published in Nature Health, which attributes two-thirds of these deaths directly to climate change.

Unprecedented heatwaves strike Europe

Between June and August 2026, heatwaves affected 30 European countries with an intensity never before recorded. Researchers from Imperial College London and the London School of Hygiene & Tropical Medicine modeled mortality in 854 cities, which represent 40% of Europe’s population, finding that extreme temperatures caused 50,391 deaths.

A third of deaths occur in one month

The period from June 17 to July 1 alone accounted for a third of all heat-related deaths in 2026. During this time, continental temperatures were 5 degrees Celsius above the seasonal average. Emergency hospital services saw a 15% rise in admissions, with Naples' funeral services overwhelmed by the demand.

2026 heatwave breaks all previous records

The 2003 heatwave caused 28,000 deaths, and the one in 2022 recorded 29,000. The 2026 summer surpasses these figures almost double. Clair Barnes, a researcher at Imperial College London, said the summer of 2026 is likely the worst for heat-related mortality in much of Europe. CNN data show Western Europe’s temperatures were 2.9 degrees Celsius above the 1991-2020 average.

Climate change responsible for most deaths

The study found that 32,600 of the 50,391 deaths, or 65%, were directly caused by climate change from fossil fuels. Malcolm Mistry, a climatologist at the London School of Hygiene & Tropical Medicine, said this proportion is more alarming than the total number of deaths. Anthropogenic climate change’s share of heat-related deaths increased from 40% at the start of the century to 65% in 2026.

Naples bears the highest death rate

Naples holds the European record for heat-related deaths, with 815 per million inhabitants. The city’s high urban density, heat islands, and structural poverty contribute to this crisis. Dr. Mario Guarino, an emergency physician in Naples, noted that loneliness and financial hardship leave many elderly people without air conditioning or the means to use it.

Heat deaths reflect economic inequality

Poorer populations, without access to air conditioning or living in poorly insulated homes, are most affected by heat. In the UK, 4,354 heat-related deaths were recorded, with 2,500 attributed to climate change. Social isolation, often linked to financial instability, increases the risk of death from heat. While most victims were over 85, more than 800 young adults also died, showing that economic vulnerability affects all age groups.