Heat Wave's Deadly Toll: 200 Climate-Related Deaths in Swiss Cities

New research reveals climate change contributed to approximately 200 heat-related deaths in Swiss cities during summer 2025, with Zurich most affected.

Key Takeaways

Climate change was responsible for 68% of all heat-related deaths in 854 European cities surveyed
Zurich recorded the highest number of heat-related deaths in Switzerland with 49 casualties
The study has not yet undergone peer review

By The Numbers

200

Heat-related deaths in Swiss cities

16,500

Total heat-related deaths in European cities

49, 33, 29, 27

Deaths in Zurich, Bern, Geneva, and Basel respectively

They Said

"The majority of heat-related deaths go unreported"
— Researchers

Key Findings and Impact

Swiss Cities Most Affected

European Context

Health Implications and Response

Sources & References

Climate crisis led to 200 heat-related deaths in Switzerland in summer 2025

SWI swissinfo.ch