A report from the EU’s Copernicus climate monitoring service documented that western Europe endured its most intense summer heat on record, with surface air temperatures running 2.5 degrees Celsius above the recent decadal average from June through August. More than 60 percent of the western region experienced temperatures exceeding 30 degrees Celsius on 17 days throughout the season, compared to 11 such days in 2003 and seven in 2025. At least 60 percent of western Europe also suffered through 13 days classified as “very strong” heat stress, surpassing 38 degrees Celsius.
The broader European continent recorded its third-hottest summer on record, though with milder conditions than the western portion. The extreme heat contributed to tens of thousands of deaths across the region while simultaneously destroying agricultural harvests and forcing the closure of power plants unable to operate in such conditions. An unusually early heatwave began in late May and persisted through September, with recurring heat waves intensified by climate change. European sea surface temperatures also broke records this summer, while major rivers recorded their lowest flows in more than 30 years.
The combination of intense heat, widespread drought, and dry conditions created severe wildfire conditions. Fire weather severity in 2026 reached the worst levels ever recorded, according to data from the European Forest Fire Information System. By late September, approximately 680,000 hectares had burned, marking the third-worst total on record. Additionally, wildfire smoke released 30 percent more fine particulate matter into the atmosphere compared to the two-decade average, creating significant public health concerns.
Climate scientists attributed the extreme conditions primarily to fossil fuel pollution accumulating in the atmosphere, though a strengthening El Niño pattern also elevated global temperatures. Experts emphasized that the cascading effects of the heat extended beyond temperature records, affecting water supplies, energy infrastructure, transportation networks, ecosystems, and human health. Medical professionals and climate researchers have called on governments to reduce fossil fuel consumption while implementing adaptation strategies such as increasing urban vegetation, improving building shade coverage, and installing air conditioning in hospitals, schools, and care facilities.
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