The United Kingdom recorded an estimated 2,877 excess deaths linked to two major heatwaves during May and June 2026, according to a rapid assessment released by the UK Health Security Agency (UKHSA).
The preliminary figures mark a dramatic increase from the 1,504 heat-associated deaths recorded throughout the whole of summer 2025, highlighting the growing health risks posed by prolonged periods of extreme heat.
June Heatwave Accounted for Majority of Deaths
The report estimates that 753 deaths were associated with the hot weather experienced between 24 and 27 May, while a further 2,124 deaths were linked to the more severe heatwave that affected the country from 21 to 28 June.
Although the figures remain provisional and will be updated in the agency’s annual report next year, they already place 2026 close to the record set in 2022, when 2,985 heat-related deaths were reported across England.
Record Temperatures Trigger Highest-Level Health Alert
The June heatwave lasted for eight consecutive days and prompted the issuance of a red Heat-Health Alert, only the second time England has reached the highest warning level since the alert system was introduced.
The period also saw exceptional temperatures, with the Met Office confirming new monthly records.
Temperatures climbed to 31.5°C at Kew Gardens on 26 May before soaring to 37.7°C in Lingwood, Norfolk, on 26 June.
Health officials said the extreme conditions underscored the growing importance of early warning systems designed to protect vulnerable communities during periods of dangerous heat.
Early-Season Heat Presents Additional Challenges
UKHSA noted that heatwaves arriving earlier in the year can have an even greater impact because individuals, healthcare providers and local authorities may not yet be fully prepared for sustained high temperatures.
The agency said its Heat-Health Alert system, operated in partnership with the Met Office, plays a crucial role in helping emergency services, health organisations and local authorities prepare for periods of dangerous weather.
To strengthen preparedness, UKHSA recently updated its Adverse Weather and Health Plan for England covering the 2026–2027 period.
Experts Warn Climate Change Could Worsen Future Summers
Dr. Ross Thompson, Principal Environmental Public Health Scientist at UKHSA and author of the assessment, said the latest findings illustrate the serious health consequences that extreme heat can have, particularly for older adults and people living with underlying medical conditions.
He warned that if additional heatwaves occur later this summer, 2026 could become the deadliest year on record for heat-related deaths in England.
Thompson also stressed that climate change is expected to increase both the frequency and intensity of extreme heat events, making long-term adaptation and preparedness increasingly important for communities and public services.
Government Expresses Concern Over Pressure on NHS
Health and Social Care Secretary Yvette Cooper said the prolonged periods of extreme heat had placed considerable strain on both public health and the National Health Service.
She noted that while winter has traditionally been viewed as the period of greatest pressure on healthcare services, increasingly severe summers are creating a new set of challenges for hospitals, emergency responders and care providers.
Cooper also extended her sympathies to families who lost loved ones during the recent heatwaves and praised NHS staff, care workers and emergency personnel for their efforts in caring for vulnerable people throughout the exceptionally demanding period.
Public Urged to Protect Vulnerable People During Hot Weather
With more hot weather still possible before the end of summer, health officials are encouraging the public to remain vigilant and check on elderly relatives, neighbours and others who may be particularly vulnerable to high temperatures.
The agency also advised people to seek medical assistance promptly if they become concerned about their own health or the wellbeing of someone affected by the heat.
While the latest figures remain provisional, UKHSA said the final analysis will be published in its annual report in early 2027, providing a clearer picture of the full health impact of this year’s record-breaking summer heat.
