Copernicus: June 2025 – Third-warmest June globally.

From the press release issued today (7 Jul 2025):

“June 2025 saw an exceptional heatwave impact large parts of western Europe, with much of the region experiencing very strong heat stress. This heatwave was made more intense by record sea surface temperatures in the western Mediterranean. In a warming world, heatwaves are likely to become more frequent, more intense and impact more people across Europe.”
– Samantha Burgess, Strategic Lead for Climate at ECMWF

Global Temperatures 

• June 2025 was the third-warmest June globally, with an average ERA5 surface air temperature of 16.46°C, 0.47°C above the 1991-2020 average for June.
• June 2025 was 0.20°C cooler than the record June of 2024, and 0.06°C cooler than June 2023, which was the second warmest.
• June 2025 was 1.30°C above the estimated 1850-1900 average used to define the pre-industrial level. It was only the third month in the last 24 with a global temperature less than 1.5°C above the pre-industrial level.*
• The 12-month period of July 2024 – June 2025 was 0.67°C above the 1991-2020 average, and 1.55°C above the pre-industrial level.

And

Europe and other regions 

• The average temperature over European land for June 2025 was 18.46°C, 1.10°C above the 1991-2020 average for June, making the month the fifth-warmest June in the record.
• Most of western and central Europe experienced warmer-than-average air temperatures in June 2025. Western Europe as a whole saw its warmest June on record, with an average temperature of 20.49°C, 2.81°C above the 1991–2020 average. It narrowly surpassed (by only 0.06°C) the previous June record set in 2003 (20.43°C).
• Two major heatwaves in mid- and late June 2025 affected large parts of western and southern Europe. Much of the region saw feels-like temperatures exceeding 38°C, corresponding to ‘very strong heat stress’. Parts of Portugal saw feels-like temperatures reach around 48°C or ‘extreme heat stress’. An additional analysis of these heatwaves can be found here.
• Outside Europe, temperatures were most above average over the United States, northern Canada, central Asia, eastern Asia, and west Antarctica.
• Temperatures were most below average over southern South America, with record cold conditions recorded in Argentina and Chile. India and east Antarctica also had below-average temperatures.

And

Sea surface temperature

• The average sea surface temperature (SST) for June 2025 over 60°S–60°N was 20.72°C, the third-highest value on record for the month, 0.13°C below the June 2024 record.
• An exceptional marine heatwave developed in the western Mediterranean in June, leading to the highest daily SST ever recorded for the region as a whole in June (27.0°C), corresponding to the highest daily SST anomaly for any month (3.7°C above average).