A severe heatwave across Western Europe in June 2026 caused dozens of heat-related deaths and widespread disruption to power, transportation, schools and cultural sites, while exposing housing inequality and infrastructure weaknesses in France and the UK. In France, Prime Minister Sebastien Lecornu activated the highest level of health services mobilisation to redirect resources toward heat-affected populations, while more than 44 million people were placed under the highest red alert for heat this week.
Fortress Infrastructure, Fragile Lives
Daytime temperatures exceeded 40C in many places and stayed dangerously hot at night, a blunt reminder that the people at the bottom are expected to absorb the costs of a climate crisis they did not design. The extreme heat led to higher air pollution, a rise in hospital admissions, school closures and train cancellations. It also caused power cuts to thousands of homes from Brittany to the south-east, leaving people unable to ventilate their homes with electric fans or close electric blinds.
French nuclear energy output was reduced as high temperatures limited access to cooling water, and hundreds of thousands of poultry perished in the heat, overwhelming carcass collection services. The state’s grand systems, from energy to transport, were forced into emergency mode by weather that had become a stress test for a society built with little room for the vulnerable.
Transport in London and southern England was disrupted by heat-related speed restrictions, with guidance advising only essential travel and resulting cuts to services. In England, hospitals declared critical incidents as cooling units, laboratories and digital systems failed, contributing to overcrowding and risks to patient care. Doctors said radiotherapy machines and MRI scanners failed, critical IT systems stalled and cooling units that serve entire hospitals broke down.
The hot weather also prompted a surge in admissions and people arriving at A&E, causing severe overcrowding in some places and exacerbating heat-related pressures on infrastructure. One physician said, “Lots of people, especially older patients, are turning up having collapsed or with dehydration.” Another doctor said older patients in one geriatric ward had been forced to endure temperatures as high as 35C. A second doctor said, “My workplace was ‘unfit to cope’,” and described “awful conditions” in sweltering wards, clinics and corridors.
NHS staff were also navigating the challenge of providing care while sleep-deprived, and some medics were unable to work because their children’s schools had closed. Several NHS trusts in England declared critical incidents as a direct result of the extreme heat. One hospital did so after its machines failed in multiple areas, with labs used for testing affected and two linear accelerator machines, used to treat cancer patients, stopping working amid the high temperatures.
The doctor said their NHS trust had faced “major issues” with IT servers overheating on Wednesday and that staff were asked to turn off non-essential computers and electrical equipment, including lights. In Portsmouth, the Queen Alexandra hospital declared a critical incident after extreme heat caused cooling units to fail, leading to “elevated temperatures” across the hospital. The failure of the cooling units affected the hospital’s digital systems and critical clinical services, including operating theatres, cardiac catheter laboratories and diagnostic scanning facilities, Portsmouth hospitals university NHS trust said.
Its deputy chief executive, Mark Orchard, said, “The unprecedented pressures created by the current heatwave, combined with the failure of a number of our chiller units, have led to significant disruption across several of our services.” Some planned care and appointments were cancelled, while patients attending appointments were advised to bring lots of water as the hospital was “very hot.” In Norfolk, hundreds of patients had hospital appointments cancelled after MRI scanners stopped working in the extreme heat. Norfolk and Norwich university hospitals NHS foundation trust declared a critical incident, saying cooling systems that kept its scanners running had been affected by the hot weather and humidity. It said it currently had “no working MRI scanners” across its Norwich sites, including those at its main hospital and its community diagnostic centre.
Housing as a Heat Trap
The impact of the heatwave was made considerably worse by the high proportion of French buildings and infrastructure not designed to cope with high temperatures. Paris, one of Europe’s most densely populated cities, known for its poorly insulated housing stock, has for years been considered to have the highest heatwave mortality risk of any capital on the continent. The French government has been criticised for a lack of preparation and for cutting funding for projects designed to adapt infrastructure to the climate crisis.
Half of all French homes have insufficient protection from high temperatures, leaving inhabitants dangerously overheated, a report for the NGO Fondation pour le Logement found this month. About 66% of French people struggle to tolerate the heat in their homes. Maïder Olivier, the head of climate advocacy at the NGO, said France had a “massive and worsening problem of heat-trap housing.” She said climate inequality in France was growing, with low-income, suburban housing estates suffering the worst from heatwaves.
“One of the aggravating factors is having no possibility of escape,” she said. Many residents on heavily concreted estates had a lack of green space around their homes, often worked jobs in high temperatures without air conditioning, had to travel on crowded, hot buses and could not afford to leave on holiday in the summer.
In Grigny, one of the poorest towns in the greater Paris area, Aboubakar, 60, who once worked in a hotel kitchen, wept as he stood below his fourth-floor flat, which he felt could reach 40C inside. “I’m suffocating,” he said. “I can’t afford to buy a fan. There are no shutters on my flat. At night I can’t sleep, it’s like a furnace.” He said the heatwave had affected his mental health and that other problems, such as his illness and housing insecurity, felt much worse in the heat. “It’s impossible to be inside my flat during the day so I come down and sit under a tree,” he said.
Roland, 20, a student doing a youth work apprenticeship, had woken at 7am to have breakfast with his girlfriend on a bench under some trees before the temperatures rose too high to be outside. “We try to close the shutters and stay in the dark in our flat but there’s no air,” he said. “It can be depressing. We only dare open a window in the middle of the night. We don’t use electric fans because it costs too much.”
Inès Seddiki, the founder of the organisation Ghett’up in Seine-Saint-Denis north of Paris, said young people from suburban housing estates were particularly suffering in the extreme heat. “They are not causing the climate crisis but they are the least protected from its consequences,” she said. “There is a lack of medical facilities in their areas for health support, their homes are heat traps, and the heatwave has exposed the racism in our society against them.” She said when young people from the banlieue left their areas to try to seek respite, for example at the seaside, “some French commentators talk about an ‘invasion’ because it is a group of 15-20 young people who are Black or north African.” She said the heatwave had revealed the “inequality and segregation in French society.” Several towns in the richest area west of Paris, including Neuilly-sur-Seine, this week banned access to their municipal swimming pool for anyone coming from other towns.
The City for the Few
In Paris, the heatwave turned the city’s iconic zinc roofs into a health hazard for people living directly underneath in cramped attic dwellings that retain the searing heat and are impossible to ventilate. Amelie Kenney, a 23-year-old recent graduate, said, “It’s been the worst week that we’ve had in this apartment.” She said, “It’s just baking in the whole afternoon and it’s impossible to just get a respite.”
Kenney and her partner, Francesca Pilia, also 23, live in a sixth-floor walk-up with a desk, a double bed and a small electric piano squeezed into the apartment. Their one window, protruding from the zinc roof, faces west and is in direct sun from midday to dusk. They split the rent of 735 euros ($835) a month. Kenney said, “It was the cheapest place to be.” She added, “I like that it looks out onto the square. I can see marriages almost every Saturday morning.” But she also said, “But now I think if I could spend extra money to be somewhere else, I would.”
The apartment’s occupants said they invested in a small electric fan, take cold showers, sponge themselves down with a wet rag, hydrate and struggle with whether to keep the window open. Kenney said, “I’ll wake up and I’ll decide, it’s too hot, I have to open the window. An hour later, I wake up, I say, ‘It is too loud, I have to close the window.’” She called it “a very, very Kafkaesque cycle.”
France’s public health agency said in a report last year that a study of a record-breaking 2003 heat wave blamed for 15,000 heat-related deaths found that living in a Paris attic room directly under the roof increased the risk of death by more than fourfold. Researchers who studied heat-related deaths in European cities for a study published in The Lancet Planetary Health journal in 2023 found that Paris had the highest risks of heat-related deaths out of 30 European capitals they looked at.
About three-quarters of Paris rooftops use sheets of zinc as covering, and the tradecraft of its zinc roofers is recognized as a valued cultural heritage for humanity by UNESCO. Zinc is weather-resistant, malleable and can be recycled, but as a metal it also absorbs and conducts heat. Maider Olivier, with The Foundation for Housing for the Disadvantaged campaign group, said, “People find the rooftops of Paris charming. There’s the image of the attic room. But in reality, when you look at who lives in these apartments, it’s often students paying a great deal of money for a small room.”
She said, “Not only are they extremely exposed to heat, but it’s also impossible to create cross-ventilation to get rid of the heat at night.” She also said zoning regulations intended to preserve Paris’ character, including its signature rooftops, hinder efforts to adapt housing to extreme heat. “There are people who are unable to insulate their roofs or install shutters to block the sun and prevent their homes from overheating because of regulations to protect the rooftops,” she said. “But these regulations which protect the rooftops of Paris do not protect the people who live beneath those rooftops.”