PARIS — Two children died after being left in a hot car outside Lyon. In southern Spain, the thermometer reached 45 degrees Celsius. Across a continent that was not built for this kind of heat, Europe’s worst heatwave in more than twenty years is still expanding its death toll.
As of Wednesday, Spain’s official mortality surveillance system, the MoMo network, estimated 212 deaths linked to the heat in just four days, from Sunday through Wednesday. France had recorded at least 40 drowning deaths, most of them young people who sought relief in rivers and unsupervised lakes, along with 18 deaths directly attributed to heat exposure. In the United Kingdom, Somerset recorded 36.4 degrees Celsius on Thursday, the highest June temperature in the country’s recorded history.
The World Health Organization issued a warning that was unusual in its directness. “Leaders must prioritise investment in climate-resilient health systems, while also accelerating climate action and mitigating the drivers of the climate crisis,” the WHO director-general said Wednesday, as temperatures in France hit their highest nationally-averaged reading on record for the second consecutive day, with one town in the southwest exceeding 44 degrees Celsius.
At least 101 million Europeans are experiencing temperatures above 35 degrees Celsius, according to the World Meteorological Organization. This is the second major heatwave to strike the continent in less than two months. The first, in late May, prompted the United Kingdom to issue its earliest major heat warning in recorded history. The current episode is worse.
The structural problem Europe faces is not meteorological. It is architectural and physiological. Approximately 20 percent of European homes have air conditioning, compared with more than 90 percent in the United States and South Korea. The populations most exposed are elderly people living alone, people experiencing homelessness, outdoor workers, infants, and individuals taking psychiatric or cardiac medications that impair the body’s ability to regulate temperature.
“When temperatures hold at 35 to 40 degrees through the night, the human body has no recovery window,” said Dr. Renaud Piarroux, an epidemiologist at Paris’s Hôpital Pitié-Salpêtrière who has studied the health burden of European heat events. “The heart has to keep working. Blood thickens. Kidneys under-perfuse. For someone who is 80 years old or has chronic heart failure, three nights like this can be fatal without anyone nearby to notice.”
The comparison European health officials return to most often is 2003. That summer, a 14-day heatwave killed approximately 70,000 people across the continent, more than 15,000 in France alone, where the carnage was so severe that morgues ran out of space and refrigerated trucks were commandeered for bodies. That disaster prompted a continent-wide restructuring of heat-health response plans, including France’s national canicule system, which triggers specific health protocols at defined temperature thresholds.
Those plans are now activated. France’s public health agency, Santé Publique France, raised the canicule alert to its highest level in eight of 13 regions on Wednesday. More than 845 schools have been closed or forced to alter their schedules. French grid operator RTE warned of rolling power outages as air-conditioning demand spiked in commercial and public buildings, according to France 24.
Spain’s response has been contested. The death figures from the MoMo surveillance system (212 in four days) are statistical estimates, not a confirmed count. The system compares current mortality against a seasonal baseline and attributes the excess to the heat. Critics note that no national-level alert was issued until June 23, two days after temperatures began their ascent toward 45 degrees in Andalusia, according to reporting by Al Jazeera.
The WMO noted Thursday that the extreme heat is disrupting economic activity, infrastructure, and agriculture across the continent. Power transmission lines lose efficiency at high temperatures, agricultural crops across the Iberian Peninsula and southern France face acute stress, and wildfire risk has spiked.
What the WHO warning explicitly addresses is the structural gap between the heat forecasts that meteorologists can now produce with high confidence, days to weeks in advance, and the capacity of health systems to act on them. Heat-health action plans exist on paper across Europe, but implementation varies sharply. Wealthy urban areas tend to open cooling centers, conduct welfare checks on elderly residents, and halt high-intensity outdoor work. Rural areas with fewer resources often do neither.
The International Federation of Red Cross and Red Crescent Societies has called on governments to close that gap before the summer deepens. “For thousands of people across Europe, extreme temperatures, without action, can quickly become a matter of life and death,” the federation said.
The final toll from this episode is not yet known. The 212 deaths estimated in Spain cover only the period through Wednesday. Temperatures remained at or near record levels on Thursday and are forecast to stay elevated through the weekend. France’s excess mortality will not be calculable for days. Scientists who have studied the link between marine heat waves and this summer’s escalating extreme weather conditions have noted that heatwaves of this intensity, once considered once-in-a-generation events in northern and central Europe, are projected to arrive every two to three years by 2035. The continent’s health systems were not designed for that frequency, and neither was the infrastructure that supports them.
