The ‘silent killer’: what you need to know about heatwaves
Heatwaves are becoming increasingly dangerous due to climate change, with an estimated half a million deaths attributed to hot weather each year. The health risks associated with extreme heat include exacerbated chronic illnesses and increased accidents, particularly affecting vulnerable populations. As global temperatures rise, the frequency and intensity of heatwaves are expected to worsen, necessitating urgent action to mitigate their impact.
- ▪Heatwaves kill an estimated half a million people each year, making them a significant health threat.
- ▪High temperatures stress the body, particularly affecting those with chronic illnesses, leading to increased mortality.
- ▪Vulnerable groups, including outdoor workers, the elderly, and low-income individuals, are at greater risk during heatwaves.
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Hot weather in the City of London. Photograph: Martin Godwin/The GuardianView image in fullscreenHot weather in the City of London. Photograph: Martin Godwin/The GuardianClimate crisisExplainerThe ‘silent killer’: what you need to know about heatwavesHow spells of hot weather put us in danger and what measures we can take to protect ourselvesAjit NiranjanTue 26 May 2026 07.17 EDTFirst published on Fri 27 Jun 2025 09.22 EDTSharePrefer the Guardian on GoogleHeatwaves have grown hotter and stronger as the planet has warmed, making what doctors call a “silent killer” even more dangerous. How worried should we be about heat – and how can we stay safe as the climate changes?How many people die from heat?Hot weather kills an estimated half a million people each year.
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