Europe’s summer of 2026 brought record heat stress across western Europe, widespread drought, unusually low river flows and an exceptionally active wildfire season, according to a new assessment from the EU’s Copernicus Climate Change Service.
Copernicus said western Europe recorded its hottest summer on record, while Europe as a whole experienced its third-warmest summer. Average surface air temperatures in western Europe during June, July and August were 2.5C above the 1991–2020 average.
Western Europe records prolonged heat
The Copernicus assessment found that at least 60% of western Europe experienced temperatures above 30C on 17 days during summer 2026. The same threshold was reached across at least 60% of the region on 11 days in 2003 and seven days in 2025.
Heat stress was also unusually persistent. Copernicus recorded a record number of days with strong or very strong heat stress across western Europe, with very strong heat stress corresponding to feels-like temperatures of at least 38C under the Universal Thermal Climate Index.
The heat arrived unusually early, with a major heatwave affecting parts of western Europe in late May, and periods of exceptional warmth continuing into September.
Heat, drought and fires compounded the impacts
The summer’s conditions extended beyond high temperatures. Copernicus reported much drier-than-average conditions across western and central Europe and widespread low river flows. Record-low seasonal flows affected large stretches of several major European rivers, including the Rhine, Danube, Seine, Rhône and Loire.
The low water levels disrupted navigation and placed additional pressure on irrigation, energy production and freshwater resources. Persistent dry conditions also helped fuel wildfire activity, particularly in Spain and France.
By the end of September, about 680,000 hectares had been burned by wildfires across Europe, according to data cited in the Guardian, making 2026 the third-worst year on record for burned area by that point. Wildfire emissions also contributed to dangerous air pollution, with fine particulate matter emissions reported at around 30% above the average of the previous two decades.
Health and infrastructure under pressure
The Copernicus assessment said the consequences of the summer extended to water availability, energy systems, transport, ecosystems and human health.
Heat exposure is particularly dangerous for older people, young children, people with existing health conditions and workers who spend long periods outdoors. The Guardian reported that recurring heatwaves were linked to tens of thousands of deaths across Europe, while harvests were damaged and some power plants were affected by the extreme conditions.
European climate and health experts have called for measures including more urban shade and greenery and better cooling in hospitals, schools and care facilities. The recommendations reflect the need to reduce exposure to extreme heat while strengthening infrastructure against interconnected climate risks.
What the summer shows about Europe’s climate risks
Copernicus said the 2026 summer demonstrated how heat, drought, wildfire, low river flows and other environmental pressures can occur together and affect multiple systems at the same time.
The assessment also recorded unusually warm European sea surface temperatures, adding another element to the season’s exceptional conditions.
For Australia, the European experience offers another example of how extreme heat can affect cities, agriculture, water resources, energy systems and ecosystems simultaneously. Australia By Aussie has also reported on how Berlin residents are using a digital platform to coordinate watering of street trees during hot weather, providing a practical example of community action alongside city services.
As temperatures rise, the Copernicus assessment highlights the importance of preparing for heat and drought while considering the wider effects on water, energy, transport, food production and public health.
Sources: Copernicus Climate Change Service; The Guardian.
