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Study Finds Climate Change Heightened June Heatwave by Up to 4 °C

Rapid attribution research indicates human-driven warming contributed to roughly 1,500 of the 2,300 premature deaths linked to the European heatwave

Overview

  • The Mediterranean Sea experienced its warmest June on record, with marine heatwaves affecting 62% of its surface at unprecedented intensity.
  • Western Europe logged its hottest June ever, averaging 20.49 °C and enduring two early heatwaves that regularly exceeded 40 °C. Copernicus data confirm June 2025 as the third hottest June globally, with a 16.46 °C average air temperature and intense marine heatwaves across one-fifth of the ocean surface.
  • A rapid attribution study published July 9 found that human-driven climate change amplified Europe’s heatwave by 2 °C to 4 °C in most cities.
  • The same study estimates about 2,300 premature deaths between June 23 and July 2, of which roughly 1,500 would not have occurred without anthropogenic warming.