Fewer heat-related deaths in 2025 despite warmest summer

• Despite record temperatures (38°C peak, 16.1°C mean) and four heatwaves in summer 2025, heat-related mortality decreased, suggesting improved public health preparedness and heat-health alert systems are effective
• The sustained high temperatures across multiple heatwave events did not translate to expected excess deaths, indicating population adaptation and potentially better awareness of heat risks among vulnerable groups
• Current UK heat mitigation strategies warrant continued investment, as they appear to be successfully protecting population health even during unprecedented thermal stress

Summer 2025 was the warmest UK summer on record, with four heatwaves, a top temperature of nearly 38C and a mean temperature of 16.1C

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