Record Heatwaves Hit Major Cities in 2025: Impact and Response

Background

In recent years, the frequency and intensity of heatwaves have increased globally, driven by climate change and urban expansion. Scientists have repeatedly warned that extreme weather events could become the norm if greenhouse gas emissions are not curbed. In 2025, this has proved true in an unprecedented way, as major cities across continents are experiencing record high temperatures. Meteorological agencies are reporting that this year’s heat is surpassing previous records and challenging infrastructure worldwide.

What is happening now

As of June 2025, several major cities—including Paris, New York, Tokyo, and Mumbai—are seeing heatwaves with temperatures exceeding 40°C (104°F). Authorities are issuing red alerts and urging residents to stay indoors during peak hours. Hospitals are responding to a marked increase in heat-related illnesses, while demand for electricity is straining power grids due to widespread use of air conditioning. Public transport systems in some regions have also been disrupted by the extreme temperatures, causing commuter delays and logistical challenges.

Impact on Switzerland

Switzerland, while not facing the highest spikes, is also experiencing unusually hot weather. Swiss cities such as Geneva and Zurich have recorded temperatures well above the June average. Local government agencies are implementing heat action plans, providing water distribution points, and advising the elderly to take extra precautions. Swiss agriculture faces challenges as heat stress affects crops and livestock, while mountain regions grapple with accelerated glacier melt, increasing the risk of landslides and flooding downstream. Public health and energy demand are current focal points for Swiss authorities.

What happens next

Authorities globally and in Switzerland are evaluating long-term solutions, including updating building codes, expanding green urban spaces, and enhancing early warning systems. Researchers stress the need for sustained climate policies and global cooperation to reduce emissions and support cities in adapting to new temperature norms. The ongoing situation will continue to be monitored throughout the summer, and further adaptation initiatives are expected as policymakers respond to the evolving crisis.