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Record Heat Stress Hits 52% of Europe This Summer
Confirmed
In Short: According to the EU's climate monitor, 52% of Europe faced intense heat stress this summer, breaking temperature records and causing widespread health impacts.
The European Centre for Medium-Range Weather Forecasts (ECMWF), which operates Copernicus, reported that 52% of Europe was exposed to 'very strong' heat stress, defined as conditions where temperatures feel hotter than 38C, during the summer of 2026.
Samantha Burgess, climate lead at ECMWF, highlighted that this summer was not only marked by the intensity of the heat but also its geographical extent, with four of Europe's top 10 heatwaves occurring this year alone.
The summer was the continent's third warmest on record and the hottest for western Europe, with several countries reporting all-time temperature highs. It also saw 80% of the continent experiencing 'strong' heat stress, or feels-like temperatures of more than 32C, for a record 41 days.
Burgess noted that heat stress, which occurs when the body's natural cooling systems are overwhelmed, was the leading cause of weather-related mortality globally. Symptoms range from dizziness and headaches to organ failure and death.
The summer was also characterized by dry conditions, leading to the lowest river flows since records began in 1992. This disrupted freight transport and put pressure on irrigation, nuclear reactor cooling, and hydropower.
Scientists have repeatedly warned that human-driven climate change is increasing the frequency and intensity of extreme heat across Europe, making droughts more severe in many regions.
By the end of August, drought affected almost half of Europe, exacerbating the already severe heat stress conditions.
Burgess emphasized that the summer of 2026 demonstrated how heat stress is becoming both more widespread and more persistent, with multiple record-breaking events throughout the season.
What this adds
The summer of 2026 was marked by an unusually early onset of heatwaves, which continued throughout the season.
Drought conditions have been increasing over the last 45 years in Europe, contributing to the severity of the heat stress experienced this summer.
What's confirmed
- Fuelled by climate change, the world's fastest-warming continent endured a relentless series of heatwaves that began unusually early in the spring, shattering temperature records and causing 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.
- Four of Europe's top 10 heatwaves occurred this past summer alone, Burgess said in a media briefing, with August 2003 still ranking as the most severe ever recorded.
- It was the continent's third warmest summer on record and the hottest for western Europe, with several countries reporting all-time temperature highs.
- Around 80% of the continent experienced "strong" heat stress, or feels-like temperatures of more than 32C, which occurred on a record 41 days by the end of the season.
- "Summer 2026 demonstrated how heat stress is becoming both more widespread and more persistent," Ms Burgess said, noting that it was the leading cause of weather-related mortality globally.
- The summer was also marked by dry conditions that led to the lowest river flows since records began in 1992, disrupting freight transport and putting pressure on irrigation, nuclear reactor cooling and hydropower, according to Copernicus.
What's still developing
- “That's one of the defining characteristics of summer this year, that it was not a single record,” Burgess said.
- Heat stress occurs when the human body can no longer cool itself effectively.