Dr. Shariful Haque Priom

Europe is facing one of its deadliest climate-related disasters in recent years after an unprecedented heatwave swept across much of the continent, contributing to more than 10,000 excess deaths in just one week. The alarming toll underscores the growing human cost of extreme weather as record-breaking temperatures continue to strain healthcare systems, fuel wildfires, and disrupt daily life across several countries.

According to mortality data compiled by EuroMOMO, a European mortality monitoring network supported by the European Centre for Disease Prevention and Control (ECDC) and the World Health Organization (WHO), approximately 10,650 excess deaths were recorded during the week of June 22–28, when the heatwave reached its peak across Western Europe. More than 9,000 of those deaths occurred among people aged 65 and older, highlighting the severe risks that prolonged extreme heat poses to elderly populations.

Western Europe experienced its hottest June since records began, with temperatures soaring above 40 degrees Celsius in several countries. Germany, France, and Spain were among the hardest hit, as blistering heat shattered longstanding temperature records. Germany registered a new national high of 41.7°C after breaking previous records on three consecutive days, while France experienced its hottest day ever, with temperatures climbing to 43.8°C.

The consequences of the extreme weather extended well beyond soaring temperatures. Wildfires spread rapidly across parts of southern Europe, destroying forests and forcing evacuations in vulnerable communities. Transportation networks also faced significant disruptions as intense heat warped railway tracks, damaged roads, and affected power supplies. Emergency services reported a surge in heat-related illnesses, including dehydration, heat exhaustion, and heat stroke, while authorities also linked the unusually hot conditions to an increase in drowning incidents as people sought relief in rivers, lakes, and coastal waters.

Health experts say the mortality figures reveal the true scale of the crisis, as many heat-related deaths are not officially recorded as being caused directly by high temperatures. Instead, scientists rely on “excess mortality”-the number of deaths exceeding what would normally be expected during a given period-to estimate the broader impact of extreme heat events.

Lasse Vestergaard, chief physician at Denmark’s Statens Serum Institut, which hosts EuroMOMO, described the mortality figures as highly unusual for this time of year.

“To have this kind of excess at this time of year is unusual. It’s really high,” Vestergaard said, adding that it was difficult to explain the elevated mortality by anything other than the extreme heat. Researchers involved in the analysis noted that there were no significant outbreaks of infectious diseases, including Covid-19, that could otherwise account for such a sharp increase in deaths.

Additional estimates suggest that England and Wales experienced around 2,700 excess deaths during May and June, according to researchers from Imperial College London, the UK Met Office, and the London School of Hygiene & Tropical Medicine. France, Belgium, and the Netherlands together reported approximately 3,700 excess deaths during the recent heatwave, further illustrating the widespread impact across Europe.

Medical experts warn that extreme heat affects the human body in multiple ways. In addition to causing heat stroke, prolonged exposure to high temperatures can worsen cardiovascular, respiratory, and kidney diseases. Older adults, individuals with chronic medical conditions, young children, and outdoor workers remain among the most vulnerable groups during prolonged heatwaves.

Climate scientists have repeatedly warned that global warming is making extreme heat events more frequent, more intense, and longer-lasting. Europe has emerged as one of the fastest-warming continents, experiencing increasingly severe summer heatwaves over the past two decades. Urban areas, where concrete and asphalt trap heat, often experience even higher temperatures than surrounding rural regions, creating dangerous “urban heat island” effects.

The World Health Organization has also expressed growing concern over the health impacts of rising temperatures. WHO Regional Director for Europe Henri Kluge recently cautioned that European countries must prepare for “more deadly weeks,” noting that another heatwave was already developing over the Atlantic and could bring renewed risks in the coming days.

The latest death toll serves as a stark reminder that extreme heat is now Europe’s deadliest weather-related hazard. As climate change continues to intensify weather extremes, governments face mounting pressure to strengthen heat action plans, improve early warning systems, protect vulnerable populations, and invest in climate adaptation measures designed to reduce the devastating human impact of future heatwaves.