Europe’s June Heat Wave Sets Records and Strains Infrastructure

An unidentified person was found dead Friday night in Paris’s Canal Saint-Denis, in what authorities suspect was another drowning linked to the European heat wave, apparently after trying to escape the heat. France has been among the countries hit hardest this week, with at least 40 heat-related drowning deaths, widespread school closures, canceled outdoor events and major rail disruptions caused by thermal expansion of tracks and damage to overhead power lines.

The heat wave is spreading east over the weekend, with central European capitals expected to approach 40 degrees Celsius, including Berlin at 38, Vienna at 37 and Prague at 37. Western Europe is seeing only slight relief, with forecasts of 35 in Paris, 33 in Madrid and 30 in London. June 2026 is not yet over, but it is already shaping up as possibly the hottest June ever recorded in Europe.

Nearly half of the 850 largest cities on the continent have already broken or matched their June heat records. France recorded its hottest day ever, with temperatures exceeding 44 degrees Celsius. Britain set its June record twice in one day, reaching 36.7 degrees in Somerset. Switzerland broke an 80-year record with 38 degrees in Basel, Germany set a regional record of 41.3 in Saarbrucken, and Belgium and the Netherlands reached 40 and 39.4 degrees respectively.

The heat is also driving health and infrastructure stress. Italy has seen heat-related deaths, more emergency admissions and power cuts tied to increased air-conditioning demand. Hospitals and transport systems in Belgium and the Netherlands are under pressure, while wildlife rescue centers in Belgium say birds, especially young ones, are suffering badly. Spain continues to face worsened drought and water stress as reservoir levels fall sharply.

The heat wave is also straining Europe’s energy system, with concern that French nuclear plants cooled by the Rhone and Garonne rivers may have to cut output. Because France is central to the continent’s power grid, any production limits could disrupt regional supply, push electricity prices higher and deepen Europe’s summer energy strain. It is still too early to estimate the death toll from this wave, but past events were severe: an estimated more than 60,000 people died from heat-related causes across Europe in summer 2022, over 47,000 in the cooler summer that followed, and about 2,300 in 12 European cities during last year’s first heat wave, which began at the end of June.