UK Heatwaves Linked To Over 2,700 Deaths

A first-of-its-kind scientific study has estimated that over 2,700 people died in England and Wales during two unprecedented heatwaves this early summer, highlighting the growing impact of climate change on human life.

The Scale of the Toll

During the May heatwave (21-29 May 2026) and the June heatwave (18-28 June 2026) respectively, an estimated 550 and 2,200 deaths in England and Wales were related to heat. Both events were also record breaking; the heatwaves were record breaking since May 1944 and June 1976 respectively.

The warm temperatures were well above average for this time of year. May was also record hot with the UK hitting 35.1C at Kew Gardens on 26 May, up on the previous record of 32.8C set in 1922 and matched in 1944, and June was also record hot, with 37.7C at Lingwood, Norfolk, beating the previous record of 35.6C set in 1957, and equalled in 1976.

The Climate Change Link

Scientists were clear on the link they made between the strength of both events and global warming. Dr Mark McCarthy, Met Office: "These have been exceptional for the two early season heatwaves in May and June, both of which have broken records that had been previously set in May 1944 and June 1976 respectively, even in this warmer climate.

The influence of human activities on the warming was quantified exactly by the research team and it was estimated that daytime maximum temperatures over England and Wales were 3-4°C warmer than they would have been in the absence of this additional warming. In June, while the country was in the red-warning phase, officials warned that healthy individuals could also be in danger to their health.

Methodology and Caveats

The study, by researchers from Imperial College London, the Met Office and the London School of Hygiene and Tropical Medicine, is based on well-known statistical modelling, not on data from death certificates.

The study is based on data from previous years to predict how many deaths might have occurred in May and June 2026, and relies on assumptions about exposure to heat, so the results haven't been independently verified.

The UK Health Security Agency (UKHSA) will release its official estimate in coming weeks based on national mortality data.

The Future is in Your Hands

Professor Clair Barnes, a climate scientist at Imperial College London said she was hoping the results would encourage the public to be more careful: "That's a lot of people dying for which we don't want to see that many people dying. “If the current trends continue, it is possible...

That in the future, deaths caused by heat in some parts of northern Europe could reach the number of deaths that are historically associated with cold winters,” some researchers involved in the study said, in a striking turnaround for an area that has long been seen as a strong driver of cold winter-related deaths

This Article discusses heatwave-related mortality in a factual, public-health context. If you or someone you know is affected by extreme heat and needs guidance on staying safe, local health authorities and the NHS provide dedicated heat-health advice.