Heat-Related Deaths in 2025 Lower Than Expected Despite Record Warmth
The number of heat-related deaths recorded during the summer of 2025—the warmest on record in the UK—was significantly lower than anticipated, according to officials.
Approximately 1,504 heat-associated deaths were reported in England, based on data from the UK Health Security Agency (UKHSA), which is about half of the 3,039 deaths that had been predicted.
These figures come despite 2025 experiencing the warmest summer ever recorded, characterized by four heatwaves, a peak temperature nearing 38°C, and an average temperature of 16.1°C.
The UKHSA attributed the reduced death toll to heat health alerts and proactive measures implemented across the NHS and care systems, which likely mitigated the impact of the extreme heat.
How Hot Was 2025?
Summer 2025 featured four heatwaves, though these were relatively brief and did not break individual temperature records, according to the Met Office.
The highest temperature recorded was 35.8°C in Faversham, Kent, on 1 July. This was slightly below the 35.9°C recorded in 1976 and well under the UK's all-time high of 40.3°C set in July 2022.
Nonetheless, the season’s average temperature of 16.1°C established it as the warmest summer on record, surpassing the previous record of 15.76°C set in 2018.
The Met Office described the summer of 1976 as "iconic," noting it had 16 days exceeding 32°C compared to nine such days in 2025.
The sustained warmth was driven by multiple factors, including dominant high-pressure systems, unusually warm seas surrounding the UK, and dry spring soil conditions, the forecaster explained.
Why Were Deaths Lower Than Expected?
The UKHSA suggested that warmer conditions in late spring 2025 may have prompted individuals to adopt protective behaviors earlier than usual ahead of peak heat periods.
Dr Agostinho Sousa, head of extreme events and health protection at UKHSA, said the lower-than-expected deaths "suggests that the actions taken across the health and care system may be helping to reduce harm."
He also cautioned that ongoing vigilance remains necessary, stating:
"As periods of heat become more intense, longer and more frequent, coordinated preparation and response remain essential to protect the most vulnerable in our society."
Who Is Most at Risk?
While heat can affect anyone, certain vulnerable groups such as older adults and infants face a higher risk of serious health consequences.
Consistent with previous years, the highest heat-associated mortality rates were observed among older age groups, particularly those aged 75 and over.
Factors such as advanced age and chronic health conditions like heart disease can reduce an individual's ability to cope with the physiological stress caused by heat.
During hot weather, overheating can occur easily, sometimes leading to heat exhaustion or heatstroke.
What Is the Forecast for 2026?
The Met Office's outlook for global average temperatures in 2026 indicates it is likely to exceed 1.46°C above pre-industrial levels, potentially ranking as the fourth warmest year on record.
Although localized UK temperature projections for 2026 are not available, the recent winter season has been relatively mild.
For the upcoming Easter Bank Holiday weekend, the Met Office has issued yellow wind warnings for parts of the UK.
An area of low pressure is expected to bring gales and heavy rain to northern and western regions, with potential risks of damage and travel disruption.
The bank holiday weekend weather is anticipated to be mixed, with the possibility of snow in northern areas, while southern and eastern parts may experience extended dry spells and warm sunshine at times.
