A new analysis of the June heatwave in Europe has found that temperatures once regarded as virtually impossible are becoming an increasingly familiar part of the continent’s summers. According to researchers, it was the most severe heatwave recorded across the region they examined, with climate change making such extremes tens to hundreds of times more likely than they were only a few decades ago.
The findings from World Weather Attribution (WWA) suggest Europe is entering a period in which exceptional heat is becoming less exceptional. The continent already records more deaths from heatwaves than from floods, storms, wildfires and all other weather-related hazards combined. An ageing population, rising rates of chronic illness and unequal access to cooling are leaving millions more vulnerable as periods of extreme heat become more frequent.
The researchers examined the heatwave that affected large parts of Western Europe between June 18 and 29. They found that the weather pattern itself was not especially unusual. Similar atmospheric conditions have occurred many times before. The difference is that those same weather patterns are now unfolding in a much warmer climate, pushing temperatures far beyond what they would once have reached.
The study estimates that the June 2026 heatwave would have been about 3.5 degrees Celsius cooler during the day had it occurred under the climate conditions of 1976, one of Europe’s benchmark hot summers. Even compared with the notorious 2003 heatwave, daytime temperatures were roughly 2 degrees higher than they would have been in the climate that existed at the time.The analysis also found that June is warming faster than any other month across much of Western Europe. Daytime temperature extremes are increasing at roughly three times the global average rate of warming, while night-time temperatures are rising at about twice the global average.
Using the ERA5 climate dataset, the researchers found that many European capitals experienced not only their hottest three-day period ever recorded for June, but also the hottest consecutive three-day spell observed since 1950. They argue that these are no longer isolated events. As global temperatures continue to climb, similar heatwaves are expected to occur more often.
The effects are not shared equally and older people living alone, those with chronic illnesses, homeless people, migrants and lower-income households face the greatest risks because many lack access to cooling, heat-resilient housing or adequate healthcare. The report argues that these inequalities should sit at the centre of future adaptation policies rather than be treated as an afterthought.
Cities face additional challenges as dense development, limited green space and ageing buildings trap heat long after sunset, creating urban heat islands where temperatures remain significantly higher than in surrounding areas. Much of Europe’s housing, transport infrastructure and electricity network was designed for a cooler climate and is increasingly under pressure during prolonged heatwaves.
The researchers also assessed heat stress using the Wet Bulb Globe Temperature (WBGT), an internationally recognised measure that combines heat and humidity. During the June heatwave, nearly 45 per cent of the European cities included in the study exceeded indoor WBGT thresholds associated with potentially hazardous conditions, even for healthy people exposed over long periods.
The findings add to growing calls for governments to accelerate adaptation by upgrading older buildings, expanding urban green spaces, improving passive cooling and redesigning cities to cope with higher temperatures. But the researchers argue that adaptation alone will not be enough.Latest News, Breaking News & Top News Stories | The Express TribuneOur CorrespondentRead More