Europe, the fastest-warming continent in the world, faced a succession of heatwaves in 2026 that began unusually early in the year, breaking temperature records and contributing to tens of thousands of excess deaths. The summer of 2026 was Europe's third-warmest on record and the hottest ever recorded in western Europe, with several countries registering all-time temperature highs.
According to Samantha Burgess, climate lead at the European Centre for Medium-Range Weather Forecasts (ECMWF), four of Europe's 10 most intense heatwaves occurred during the summer of 2026 alone. Although the August 2003 heatwave remains the most severe ever recorded, this year's heatwaves were remarkable for their intensity and geographical extent.
Copernicus found that 52 percent of Europe was exposed to "very strong" heat stress, with feels-like temperatures exceeding 38C, while around 80 percent of the continent experienced "strong" heat stress, with feels-like temperatures exceeding 32C. Such conditions occurred on a record 41 days by the end of the summer season.
Heat stress occurs when the human body can no longer cool itself effectively, leading to symptoms ranging from headaches and dizziness to organ failure and death. The European summer of 2026 demonstrated how heat stress is becoming both more widespread and more persistent, with extreme heat now being the leading cause of weather-related mortality worldwide.
The heat was only one part of an unusually extreme European summer, with dry conditions pushing river flows to their lowest levels since records began in 1992, affecting freight transport and placing additional pressure on irrigation systems, hydropower production, and the cooling of nuclear reactors.
Drought has become increasingly common across Europe over the past 45 years, with drought conditions affecting almost half of the continent by the end of August. The combination of persistent heat, drought, and exceptionally low river levels highlighted how several climate extremes can now unfold at the same time.
Western Europe experienced its hottest summer on record, underlining the growing exposure of densely populated regions to sustained periods of dangerous heat. Scientists have repeatedly warned that human-driven climate change is increasing the frequency and intensity of extreme heat across Europe, while warmer conditions are also making droughts more severe in many regions.
Key points
- Europe's summer of 2026 was marked by four of its 10 worst heatwaves, record heat stress, and drought.
- The continent experienced its hottest summer on record in western Europe and third-warmest summer overall.
- Climate change is increasing the frequency and intensity of extreme heat across Europe.
