Periods of extreme heat in Switzerland during the summer of 2026 were associated with approximately 600 excess deaths, according to figures reported by Swiss health authorities and analysed in national coverage.
The impact was not restricted to the oldest members of the population. Reports indicate that people younger than 65 were also affected, underlining the fact that extreme heat can create health risks beyond traditionally recognised vulnerable groups.
High temperatures can place considerable stress on the cardiovascular and respiratory systems, particularly among people with underlying medical conditions. Heat exposure can also contribute to dehydration and other acute health problems.
The Swiss experience illustrates why heat preparedness is becoming increasingly relevant to public health. Monitoring vulnerable populations, improving access to cooling and communicating risks during heatwaves are increasingly important components of climate-related health protection.