An extraordinary heatwave is gripping large swaths of Western Europe, with meteorologists describing the event as "completely unprecedented and historic." Adrien Warnan, a forecaster at Météo-France, told reporters that the current temperatures are breaking all norms for the month of May.
Thermometers near London have already reached 35°C, while parts of France could see highs of 39°C. The United Kingdom is experiencing what is likely to be its warmest May since records began. The heat is not confined to these two countries; the phenomenon is affecting a broad corridor from the Iberian Peninsula to the Benelux nations, as a persistent high-pressure system traps hot air over the continent.
Human Toll and Adaptation
The health consequences are already being felt. Britain's Health Security Agency reported that approximately 1,500 people died due to heat in England last summer. Bob Ward, Policy and Communications Director at the Grantham Research Institute on Climate Change and the Environment at the London School of Economics, warned that the current temperatures are likely causing further fatalities. "We know that the temperatures we reached yesterday, which were nearly 35 degrees in London, unfortunately will likely have killed hundreds of people across the country, people with underlying health conditions, particularly respiratory illness. And they mainly die in homes that overheat," Ward said.
In Paris, tourists are adjusting their routines to cope. Sabina Ismailova, a 29-year-old visitor from Ukraine, described her strategy: "In the first part of the day, everything is going well and interesting. But then I'm going to my flat and just sleep because I need to have more energy, because it's so, so hot in this time." For those working indoors without air conditioning, conditions are even more challenging. Renata Stankeviciute, a Lithuanian chef living in England, told reporters: "Well, I'm working in the kitchen, so it's atrocious."
The heatwave is part of a broader pattern of extreme spring temperatures across Europe. Earlier this month, Spain braced for its first heatwave of 2025, with temperatures soaring to 38°C in May. Germany also experienced a Pentecost heatwave that brought near-30°C temperatures across the country. The current event is being driven by a so-called "heat dome," a meteorological phenomenon where a ridge of high pressure traps warm air beneath it, preventing cooling and leading to prolonged periods of extreme heat.
Experts are calling for urgent adaptation measures. Ward emphasized that Britain must make changes to homes and businesses to reduce the risk of overheating. "We need to retrofit buildings with better insulation, reflective roofing, and more green spaces to mitigate the urban heat island effect," he said. The Grantham Research Institute has long advocated for policies that address both climate mitigation and adaptation, warning that such events will become more frequent and intense as global temperatures rise.
For a deeper understanding of the meteorological forces at play, read our explainer on the heat dome driving this record May heatwave. The current episode is also part of a series of spring heat surges that are testing Europe's readiness, as detailed in our analysis of how the continent is coping with temperatures soaring to 38°C.
The heatwave is expected to persist for several more days, with little relief in sight. Authorities across affected countries have issued health warnings, urging people to stay hydrated, avoid strenuous activity during peak heat hours, and check on vulnerable neighbors. The event underscores the growing urgency for Europe to invest in climate-resilient infrastructure and public health systems capable of handling extreme weather events.
