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.