The UK Health Security Agency (UKHSA) has reported an estimated 2,877 heat-related deaths in England during the May and June heatwaves, putting the country on track for its highest ever summer total. The record of 2,985 deaths was set in 2022, and August, traditionally the hottest month, has not yet arrived.
Breakdown of fatalities
The UKHSA analysis estimated 753 deaths during the heatwave from 24 to 27 May and a further 2,124 between 21 and 28 June. This total is almost double the figure for the entire summer of 2025. The estimates are based on excess mortality during heatwave periods compared to similar times of year without heatwaves.
Government and expert responses
Health Secretary Yvette Cooper expressed condolences, stating: “My thoughts are with all those who have lost loved ones as a result of the long and intense heatwaves.” She also thanked NHS staff, care workers, and emergency responders for their work during these challenging months.
Dr Ross Thompson, principal environmental public health scientist at UKHSA, said: “The new figures highlight the significant danger that very hot weather can pose to people’s health. As the climate becomes warmer, we can expect periods of hot weather to become longer, more frequent and more extreme. That’s why it’s vital that individuals, communities and systems are prepared to deal with higher temperatures, and to ensure those most vulnerable are protected.”
Climate context and records
Heatwaves are intensified by the fossil-fuel-driven climate crisis, and the late June heatwave was the most severe and widespread ever recorded in western Europe. The heat in 2027 is expected to be exacerbated by a looming super El Niño system. A new June high temperature of 38°C was recorded at Lingwood, Norfolk, while Kew Gardens saw a May record of 31.5°C.
Dr Garyfallos Konstantinoudis of Imperial College London, co-author of a related study, said: “The UKHSA’s analysis provides clear, tragic confirmation of the significant health impact these heatwaves had across England and Wales. Let’s not forget that behind these numbers are real people who died too soon. We must take urgent action to adapt our homes, care settings, and infrastructure, while doubling down on global efforts to reach net zero and stop temperatures rising further.”
Impact on emergency services
Some ambulance services reported record numbers of calls during the heatwaves. The UKHSA estimate may be slightly revised in the coming months as full death records become available.
