Record Heatwaves Impact Major Cities Worldwide in 2025

Background

In recent years, global temperatures have been on the rise, with climate scientists warning of more frequent and intense heatwaves. Many metropolitan areas, including those in Europe, North America, and Asia, have set summer temperature records in recent decades. Cities’ built environments, combined with population density, make them particularly vulnerable to extreme heat events.

What is happening now

This summer, an unprecedented series of heatwaves has struck major urban centres, including Paris, New York, Tokyo, and Dubai. Temperatures in some cities have reached over 45°C, prompting local governments to declare emergencies. Public health systems are under strain as hospitals report spikes in heat-related illnesses, and authorities have set up cooling centres to protect vulnerable populations. In several cities, public infrastructure such as power grids and public transport systems has come under significant pressure, with service interruptions reported in multiple locations.

Impact on Switzerland

Switzerland has not been spared the broader European trend. Swiss cities like Zurich, Geneva, and Basel have experienced notably high temperatures, although they have not reached the extreme levels seen elsewhere. Swiss meteorological services have issued warnings, and public health officials are advising residents on heat protection measures. Experts note that Switzerland’s reliance on hydropower could be affected if heatwaves intensify and drought conditions accompany high temperatures, impacting water reservoirs.

What happens next

As the Northern Hemisphere summer continues, authorities are closely monitoring the situation for further record-breaking events. Urban planning specialists and climate policy makers in Switzerland and globally are renewing calls for increased investment in adaptable infrastructure, real-time health monitoring, and green urban spaces. The lasting effects of the 2025 heatwaves are expected to influence European energy policy discussions and prompt further international cooperation on climate adaptation strategies.