Scorching Summers—Extreme Heat Reshapes Europe’s Climate Reality

As summer begins, the dangerous heatwaves in Europe have already broken records in June, resulting in a shocking death toll figure, affecting human health, ecosystems, labour productivity, and infrastructure.

World Health Director-General Tedros Adhanom Ghebreyesus wrote on X that more than 1300 excess deaths have been recorded since 21 June linked to the extreme heat in Europe.

Adding that, “Right now 150 million people are living under extreme heat, hundreds have died, schools are shut, grids are buckling. Driven by climate change and global warming, the phenomenon of the “once-in-a-generation” heatwave is now occurring nearly annually. We were warned.”

The BBC notes that Germany recorded 41.7 °C in eastern Germany; the Czech Republic recorded 41.7 °C at Doksany, north of Prague; and Poland recorded 40.5 °C in Slubice. Heat stress is considered a silent killer in Europe, as its homes, buildings, infrastructure, and schools were not built for the rising temperatures.

The World Meteorological Organisation also provides a snapshot of the record-breaking heat that spanned across Europe:

Germany broke new temperature records for three consecutive days, with the town of Coschen in eastern Germany near the border with Poland reporting 41.7°C on 28 June.

Hungary: A new June temperature record of 40.7°C was set near the capital, Budapest, on 28 June, with heat forecast to intensify further. Poland also recorded a new all-time temperature record, provisionally of 40.5°C, as did the Czech Republic.

Austria set a new June temperature record of 40.0°C in Vienna, with a Red Alert continuing for the capital on 29 June.

The United Kingdom broke the June temperature record for three consecutive days, with 37.3°C recorded in southern England on 25 June –  a provisional figure which was likely to be revised upwards.

The Netherlands records a new national June temperature record of 39.4°C. Their national meteorological service, KNMI, issued an unprecedented Red Alert for extreme heat across eight provinces on 26 June.

Denmark set a new all-time high temperature of 37.0°C in two locations.

France: France recorded its hottest day on record on 24 June, beating the previous day’s record, with an average national temperature of 30.0° Celsius, above the July 2019 and August 2003 records. Temperatures rose to 43.8 °C in the town of Pulluau in western France.

Spain recorded its hottest June days on record on 23 and 24 June. In several locations, temperatures were well above 40°C, setting many new June station temperature records. The city of Bilbao reached 42.7°C, the highest June temperature recorded there.

Europe’s record temperatures were set against the backdrop of the latest WMO State of the Global Climate 2025 report, released just three months earlier, confirming that the last 11 years, 2015-2025, were the hottest period on record.

In France, more than 1,000 deaths have been linked to the scorching temperatures in June, affecting mostly people aged 65 and above. Heat stress is considered a silent killer in Europe, as its homes, buildings, infrastructure, and schools were not built for the rising temperatures.

Critical infrastructure buckles under the smouldering heat. The Times of India reports that extreme weather has damaged highways, delayed trains, strained power grids, and overwhelmed hospitals, with temperatures soaring above 40C in several European countries. Sections of Germany’s autobahn were damaged after concrete burst due to the heat. In France, asphalt-paved roads melted, nuclear power plants reduced output, and trains were delayed by extreme heat. In Paris, public hospitals are swamped with nearly 3000 heat-related emergencies for two consecutive days.

The World Weather Attribution article says the recent heatwave in Europe is the most severe ever recorded and is driven by a persistent high-pressure system. The dangerous heat in Europe would not be possible today without fossil fuels. “In 1976, when some of the previous European records were set, the 2026 temperatures would have been virtually impossible to occur in June, while also highly unlikely at any time of the year. In 2003, the first major heatwave of this century, daytime heat like this would still have been very rare, about 10 times less likely than today, while nighttime temperatures such as this June would have been more than a hundred times less likely in 2003.”

The WWA report’s findings also note that in much of Western Europe, June is warming faster than other months. Daily and nighttime temperatures are also warming faster than the global average, and because today’s climate is 1.4 C warmer than the pre-Industrial period, very high temperatures will be a regular feature in many European capital cities during the summer season.

The WWA study also assessed the Wet Bulb Globe Temperature (WBGT) – a comprehensive measure of heat stress typically used outdoors to estimate the combined effects of humidity, direct sunlight, and air movement on the body. All these interacting variables affect the body’s ability to regulate its internal temperature through sweating and heat exchange.

Their findings show that during the heatwave from June 18 to 29, 45% of European cities exceeded indoor WBGT thresholds. This means that the risk of heat is no longer limited to outdoors – the air inside buildings has become so hot and humid that the human body can no longer cool itself through sweating.

The finding is particularly alarming because only 20% of European households have air conditioning, compared with other countries. This is because of their colder climate, which is fast becoming a thing of the past, and also because ACs are expensive, and many Europeans feel guilty about the climate impacts of air conditioning. However, the climate is changing, and the summer heat will soon become unbearable, with serious health consequences.

Air conditioning can cut heat-related deaths by 75%, according to a 2007 study, and research published in The Lancet found that in 2019, 195,000 heat-related deaths among people over 65 were averted due to the adoption of AC (Andrews, 2026).