One billion children at risk from heatwaves, WHO warns – UK faces growing threat

**Lead**

The World Health Organization has warned that more than one billion children worldwide are now at extreme risk from the escalating threat of heatwaves, a crisis that is reshaping childhood itself. The United Kingdom, long accustomed to temperate summers, is not immune. As the Met Office records ever-higher temperatures and the NHS braces for repeated heat-health alerts, the cultural and practical implications for British children are becoming impossible to ignore.

**Context**

The WHO’s latest assessment on climate change and child health, released this month, highlights that children are physiologically far more vulnerable to heat stress than adults. Their bodies heat up faster, they sweat less efficiently, and they are less able to regulate their internal temperature. This makes them especially susceptible to heatstroke, dehydration, and the worsening of chronic conditions such as asthma. The report notes that heatwaves are becoming more frequent, longer, and more intense across every continent, driven by climate change. In the UK, the record-breaking temperature of 40.3°C in July 2022 was a watershed moment. Since then, successive summers have seen schools forced to close early, sports days cancelled, and playgrounds emptied during peak heat hours. The UK Health Security Agency has issued repeated amber and red heat-health warnings, with specific guidance for childcare settings and schools. The WHO’s warning underscores that no country is safe, and that the UK must urgently adapt its public health infrastructure, education policies, and cultural norms to protect the youngest and most vulnerable.

**Analysis**

The cultural impact of this warning is profound. In Britain, summer has long been synonymous with outdoor play, family holidays, and the freedom of school holidays. But as heatwaves become the new normal, the very idea of a British summer is being rewritten. Children’s daily routines – from morning assemblies to afternoon sports – are increasingly disrupted. There is a growing demand for heat-resilient school buildings: shaded playgrounds, hydration stations, and, in some cases, air conditioning in classrooms that were never designed for such extremes. Beyond infrastructure, there is a cultural shift underway. Parents are having to rethink what constitutes safe outdoor time. The traditional British expectation that children should spend hours outside for their physical and mental health now clashes with the reality of dangerous heat. This requires a recalibration of parenting norms, school policies, and even urban planning. The WHO’s warning also highlights deep inequities. Children from low-income families, who may lack access to cool spaces, gardens, or even reliable hydration, are disproportionately affected. In the UK, this mirrors existing health inequalities: children in deprived areas are more likely to live in heat-trapping urban environments and less likely to have access to green spaces or swimming pools. The government’s recent heatwave strategy and the NHS’s public health campaigns are steps in the right direction, but the scale of the threat demands a far more comprehensive cultural and policy response. The question is no longer whether heatwaves will affect British childhood, but how quickly society can adapt to protect it.

**Sources**

World Health Organization (WHO) – report on climate change and child health, 2026; UK Met Office – climate data and temperature records; UK Health Security Agency – heat-health warning guidance; NHS – advice on heatwaves and children’s health; UNICEF – reports on child vulnerability to climate change.