A single heatwave event lasting six days in late June produced more than 10,650 excess deaths across Europe, of which approximately 9,000 were among people aged 65 and over, according to S&P Global Ratings. In the UK, the May and June heatwaves combined produced around 2,877 excess deaths – almost double the 1,504 recorded across the 2025 summer. Across Europe as a whole, the economic losses from last year’s heatwave season reached approximately €43 billion, of which less than 2% was covered by insurance, according to Moody’s estimates.
