Europe’s blistering summer pushed heat to a breaking point across the continent, with a record 52% of the region exposed to intense heat stress, according to the EU’s climate monitor.
Driven by climate change, the world’s fastest-warming continent was battered by a near-continuous run of heatwaves that arrived unusually early in spring, toppled temperature records and led to tens of thousands of excess deaths.
“One of the things that stands out for 2026 is that the heat was not only remarkable for its intensity, but also for its geographical extent,” said Samantha Burgess, climate lead at the European Centre for Medium-Range Weather Forecasts (ECMWF), which operates Copernicus.
Copernicus said the season ranked as Europe’s third warmest summer on record, while western Europe endured its hottest summer, with several countries posting all-time temperature highs.
In a media briefing, Burgess said four of Europe’s 10 most significant heatwaves took place this past summer, although August 2003 remains the most severe ever recorded.
Those repeated surges of extreme heat meant 52% of Europe faced “very strong” heat stress — a threshold reached when temperatures feel hotter than 38C — Copernicus reported.
The effects were even more widespread at the next tier: about 80% of the continent saw “strong” heat stress, or feels-like temperatures above 32C, conditions that persisted for a record 41 days by the end of the season.
Heat stress sets in when the body’s cooling mechanisms can no longer keep up, a dangerous cascade that can start with dizziness and headaches and, in the most serious cases, lead to organ failure and death.
“Summer 2026 demonstrated how heat stress is becoming both more widespread and more persistent,” Ms Burgess said, adding that heat was the leading cause of weather-related mortality globally.
Copernicus also pointed to severe dryness as a hallmark of the summer, saying river flows fell to their lowest levels since records began in 1992 — a drop that disrupted freight transport and strained irrigation, nuclear reactor cooling and hydropower.
In Europe, drought conditions have been intensifying for the past 45 years.
By the end of August, nearly half of Europe was affected by drought, Ms Burgess said.
“That’s one of the defining characteristics of summer this year, that it was not a single record. It was the way that multiple records appeared together across the climate system,” Ms Burgess said.
