How deadly have the heatwaves in England and Wales been?

The heatwaves that swept across England and Wales in May and June 2026 are now estimated to have caused more than 2,700 excess deaths, making them among the deadliest extreme weather events in British history and confirming that heat has become the country's most lethal natural hazard.

The figures, compiled by the Office for National Statistics and the UK Health Security Agency, show that the death toll was concentrated among people over 75, those with pre-existing cardiovascular and respiratory conditions, and residents of urban areas where the heat island effect kept night-time temperatures above 20°C for extended periods. London, Birmingham and Manchester recorded the highest mortality rates.

The death toll from the 2026 heatwaves exceeds that of the 2022 heatwave, which killed an estimated 3,200 people across the UK, and is part of a clear upward trend. The ten hottest years in the UK's recorded history have all occurred since 2002, and each successive heatwave season has been deadlier than the last on an age-standardised basis.

Public health experts say the figures should prompt a fundamental reassessment of how Britain prepares for heat. Unlike countries such as France, which reformed its heat response after the 2003 heatwave killed 15,000 people, the UK has been slow to implement systematic protections. Air conditioning remains rare in homes and care facilities, building regulations still prioritise warmth over cooling, and public awareness of heat risks is low compared with awareness of flood or storm risks.

The UKHSA has called for mandatory maximum temperature standards in care homes and hospitals, a national programme of urban greening to reduce the heat island effect, and a public information campaign on heat safety modelled on the drink-driving and smoking cessation campaigns of previous decades.