Record June-May 2026 Heatwave Claims Thousands of Lives in England and Wales

In June 2026, England and Wales experienced three consecutive days of red-level heat warnings, the longest such period on record. During the peak (24-26 June) an estimated 440 people died each day. Across the combined May (21-29 May) and June (18-28 June) events, about 2,700 premature deaths were recorded.

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• May heatwave: ? 550 excess deaths; ? 60 % linked to the additional 1.4 °C of human-caused warming.

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• June heatwave (18-28 June): ? 2,200 excess deaths; ? 38 % attributed to global heating.

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• Overall, more than 40 % of the 2,700 deaths would not have occurred without the current level of anthropogenic warming.

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The analysis used established research on heat-related mortality in England and Wales to calculate “excess deaths,” which include heart attacks and other emergencies triggered by extreme heat.

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The UK Health Security Agency (UKHSA) issued three successive red warnings, noting heightened risk for the young, elderly and those with underlying conditions. UKHSA previously reported over 10,000 heat-related deaths in Britain between 2020 and 2024. The Climate Change Committee, warning for more than a decade, has said the UK’s protective plans are inadequate for rapidly worsening extreme weather.

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Denis Fernando of Friends of the Earth described the situation as “a national scandal that the UK remains so dangerously unprepared.”

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Prof Emma Howard Boyd, chair of the Heat Risk Commission, warned that the figures “are already approaching the reported toll from the record-breaking heat of 2022” and cautioned the government against treating them as an anomaly.

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• “These are big numbers and we don’t want to see this many people dying,” — Dr Clair Barnes, Imperial College London

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• “We’ve reached the point where the heat is so extreme that we can’t help but acknowledge the impacts it has.” — Dr Clair Barnes, Imperial College London

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• “We know that human-induced climate change is making heatwaves more frequent and more intense, both globally and here in the UK,” — Dr Mark McCarthy, Met Office

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• “It’s a national scandal that the UK remains so dangerously unprepared.” — Denis Fernando, Friends of the Earth

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• “Particularly alarming is that these figures, covering just the first half of the summer, are already approaching the reported toll from the record-breaking heat of 2022 … Government cannot afford to treat these figures as an anomaly – they are a warning of the climate we now live in.” — Prof Emma Howard Boyd, London School of Economics

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• “It really underestimates the total burden of heat.” — Dr Ross Thompson, UKHSA

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