Record heatwave engulfs Europe: France records 74 drownings, six nations shatter June temperature records

A ferocious and unusually early heatwave has gripped western and central Europe, pushing temperatures well above 40°C in multiple countries and triggering health emergencies, transport chaos and dozens of fatalities. The heat dome, which scientists say would be virtually impossible without human-caused climate change, broke long-standing June records in France, Germany, Switzerland, Denmark and Austria on 27 June, with forecasts warning that 193 million people would face temperatures above 35°C on Saturday.

Record-shattering temperatures

Germany saw its highest June temperature ever when the mercury hit 41.3°C near Saarbrücken on the French border, according to the national weather service. Switzerland recorded 39°C at Basel-Binningen, erasing a previous June record of 36.9°C set in 1947. Denmark reported 37°C, the highest temperature since measurements began in 1874, while Austria logged 38.7°C at Bad Deutsch-Altenburg near the Slovak frontier. France, which on the same day experienced its hottest day on record, saw the thermometer reach 40.4°C in several locations.

The heatwave will peak at the weekend, with temperatures far exceeding 40 degrees Celsius in some parts of Germany.

Human toll and health systems under strain

French Interior Minister Laurent Nuñez announced that 74 people had drowned since 18 June, largely in unsupervised rivers, small lakes and private swimming pools. He noted that many deaths were caused by cardiac arrest linked to thermal shock from sudden immersion. In Paris, emergency calls surged 80% week-on-week, and deputy mayor for health Antoine Alibert said stretchers were piling up in hospital corridors. Hospitals in the United Kingdom declared critical incidents as cooling systems and digital infrastructure failed, while nurseries asked parents to collect children early because school buildings had become dangerously hot.

There is a phenomenon of hydrocution, sometimes from over-activity… We are seeing many deaths from cardiac arrest.

We are in the midst of a health crisis. This is an exceptional and extreme heatwave phenomenon.

A two-speed Europe under accelerating climate pressure

New analysis by the ClimateHub consortium, coordinated by the National Observatory of Athens and supported by the EU’s Copernicus Climate Change Service, shows that southern Europe and the Balkans already endure the highest average number of heatwave days. Malta and North Macedonia are at the top, while traditionally mild countries such as the Netherlands and Norway are seeing their statistics upended by growing variability. Central Europe is recording a statistically significant increase in heatwave days that has visibly accelerated in recent years. The researchers stress that Greece starts from a much higher baseline, having experienced a steady positive trend in heatwave days throughout the 1991–2020 period.

Scientists link the heat to fossil-fuel emissions

Experts said the searing temperatures would have been practically impossible without anthropogenic climate change. The current heatwave has made nighttime temperatures this week 100 times more likely than they would have been even two decades ago. Epidemiologists drew parallels with the deadly 2003 European heatwave that claimed 70,000 lives, many of them elderly people living alone.

Climatologists have long warned that we would experience many ‘2003s’. Now that has become painfully obvious.

Disruption and warnings

Street parties and music festivals were cancelled across France, Germany and the Netherlands, though Budapest Pride went ahead despite extreme heat alerts. German authorities urged citizens to reduce water consumption, and wildfires and power cuts were reported in several French regions. The weather system began moving eastward into Poland late on 27 June, with forecasters warning that extreme heat would persist into Sunday.