Switzerland's hottest summer on record killed around 1,257 people between May and August, according to new estimates from the Swiss Tropical and Public Health Institute
That's 5.5% of all deaths in those four months — the worst heat toll since the 2003 disaster.
Around 85% of the victims were aged 75 or over, and heat remains the country's deadliest natural hazard.
The figure does not yet cover September, which was also unusually hot.
A consolidated study is due in spring 2027.
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