European Heatwave Worst Ever, Impossible Without
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- World Weather Attribution scientists concluded the heatwave is the most severe and widespread ever to hit this region of Europe and would not have been possible in June without climate change driven by fossil fuel burning.
- Western European cities faced unprecedented heat stress, with 45% of the continent's 850 largest cities enduring their worst ever combination of temperature and humidity, which impairs the body's ability to cool itself.
- The UK recorded its hottest June temperature ever at 36.7°C in Somerset on Thursday, while London ambulance service handled its highest ever single-day count of life-threatening emergencies at 641.
- Climate attribution modeling showed the same heatwave would have been 2°C cooler in 2003 and 3.5°C cooler in 1976, and sweltering night-time temperatures are now about 100 times more likely than two decades ago.
- Past heatwave mortality in Europe was severe — more than 60,000 people died in summer 2022, and UKHSA data shows over 10,000 heatwave deaths in Britain between 2020 and 2024, while a 2024 study found 2,300+ deaths across 12 cities in just three days, two-thirds attributable to climate change.
- Infrastructure and policy responses are lagging: the UK Climate Change Committee said the country's infrastructure is "built for a climate that no longer exists," and Red Cross's Carolina Pereira Marghidan warned that early warning systems installed after 2003 are no longer enough.
Why it matters: With 100 million Europeans facing temperatures above 35°C and London recording 641 life-threatening emergencies in a single day, the WWA finding that this heatwave would have been 2–3.5°C cooler in past decades gives a concrete human cost to continued fossil fuel burning. The UK Climate Change Committee's warning that national infrastructure is "built for a climate that no longer exists" signals an urgent adaptation gap that current early warning systems alone cannot close.
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