Western Europe Breaks June Heat Record as Climate Change Fuels Extreme Weather

Western Europe experienced its hottest June on record, with average temperatures soaring more than 3°C above the 1991-2020 norm, the European Union's Copernicus Climate Change Service reported on Thursday.

The average temperature in the region reached 20.74°C, surpassing the previous record set in June 2025. The heatwave, which swept across the continent from mid-June, was part of a broader pattern of increasingly frequent and intense heat extremes linked to human-induced climate change.

Globally, June 2026 was the second hottest June on record, with temperatures 1.39°C above pre-industrial levels (1850-1900). The world's oceans also recorded their highest June temperatures, driven by the developing El Niño weather pattern in the tropical Pacific.

Europe is the fastest-warming continent, and changes in atmospheric circulation are contributing to more frequent and severe heatwaves. The June heatwave was caused by a 'heat dome' — a high-pressure system that traps heat — leading to all-time and monthly temperature records in several countries.

The extreme heat had severe health impacts, with thousands of deaths reported, mostly in France, Spain, and Belgium. According to an AFP analysis, more than two-thirds of Europeans (410 million people) experienced temperatures exceeding 35°C during the June 15-30 heatwave. High humidity worsened the situation, as nighttime temperatures offered little relief, leading to multiple 'tropical nights' in a row.

The Mediterranean also faced a record-breaking marine heatwave, with hot spells affecting the Atlantic coasts and putting marine ecosystems at risk. Dry conditions raised drought risks in eastern Europe and contributed to wildfires in the Iberian Peninsula and southern France.

Samantha Burgess, strategic climate lead at the European Centre for Medium-Range Weather Forecasts (ECMWF), which operates Copernicus, emphasized that heatwaves will become more intense and longer-lasting in a warmer world. She stressed the need for Europe to develop adaptation plans, noting that many historic buildings were constructed for a climate that no longer exists.

World Weather Attribution, a network of climate scientists, stated that the June heatwave was the 'most severe ever recorded' based on three-day average peak temperatures. They concluded that such an event would have been 'virtually impossible' without climate change, and a similar heatwave in 2003 would have been about 2°C cooler.

Burgess called for urgent action to achieve net-zero emissions from fossil fuels, warning that heatwaves will only worsen as emissions continue to accumulate in the atmosphere.