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June 2025 Ranks as Third-Warmest on Record, Copernicus Finds

Record-breaking ocean temperatures in the western Mediterranean highlight the accelerating trend of global warming driven by greenhouse-gas emissions.

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Most of Western and Central Europe experienced warmer than average air temperatures in June. (AP)
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Overview

  • June 2025 was the world’s third-warmest June on record, with global surface air temperatures 1.3 °C above pre-industrial levels and 0.47 °C above the 1991–2020 average.
  • Western Europe experienced its warmest June ever, averaging 20.49 °C during back-to-back heatwaves and widespread heat stress.
  • Global sea surface temperature for June reached 20.72 °C, marking the third-highest level for the month on record.
  • An exceptional marine heatwave in the western Mediterranean drove daily sea surface temperatures to a record 27 °C, the largest global daily anomaly for any month.
  • Data from July 2024 to June 2025 show a 12-month average 1.55 °C above pre-industrial levels, underscoring persistent warming beyond the Paris Agreement’s 1.5 °C target.