In late May 2026, an exceptional heatwave struck several European countries at once, setting all-time temperature records for the month of May: 35.1°C at Kew Gardens in the United Kingdom, 40.3°C at Mora in Portugal and 37.8°C at Angoulême in France. Deaths directly or indirectly linked to the heat were recorded, with France confirming at least 7 victims, and drownings were reported in both the United Kingdom and France.
The episode exposed structural vulnerabilities: water networks under strain in the United Kingdom, electricity grids stressed in Sweden and Belgium, and health alert systems raised to their maximum level in Italy. The weather agencies consulted — Copernicus, the World Meteorological Organization and the Met Office — unambiguously attribute the event to climate change, judging that it would have been nearly impossible in an undisturbed climate.
The wider context gives the event greater significance. A joint report projects a 91% probability that the 1.5°C threshold above pre-industrial levels will be temporarily crossed at least once between 2026 and 2030, with 2027 identified as a particularly high-risk year given the return of El Niño. The convergence of extremes across northern and southern Europe challenges the map of vulnerabilities established since 2003 and is pushing previously spared countries to reassess their infrastructure.
Several readings coexist. Some actors frame the heatwave primarily as a quantifiable long-term economic shock, while others see it as evidence of lagging adaptation policies. The scope of the risk is also contested: Nordic countries and non-European observers stress that the phenomenon extends beyond the Mediterranean basin, whereas others frame it as a front-line crisis confined to the south of the continent. The degree of certainty around certain scientific projections likewise remains debated among actors.
