UK heatwave delivers exceptional sunshine and persistent 30C temperatures

Britain is in the grip of an exceptional heatwave that has delivered days of persistent temperatures above 30°C and the highest levels of sunshine ever recorded for a July week, testing the country's infrastructure, its health systems and its population's tolerance for extreme weather.

The Met Office said the heatwave, caused by a high-pressure system that has been stationary over the British Isles for more than a week, has broken several records. The temperature at Heathrow reached 36.2°C on Tuesday, the highest July reading since records began. More significantly, the persistence of the heat — seven consecutive days above 30°C across a wide area of England and Wales — is unprecedented in the historical record.

The impact on daily life has been significant. Hospitals have reported a sharp increase in heat-related admissions, with emergency departments in London and the South East operating under severe pressure. Several rail operators have imposed speed restrictions because of the risk of track buckling, and Network Rail has deployed monitoring teams to critical sections of the network. Schools in several local authorities have closed early or suspended outdoor activities.

The heatwave has also exposed the limitations of Britain's built environment. The vast majority of homes, schools and hospitals in the UK were designed to retain heat, not to stay cool, and the country has one of the lowest rates of air conditioning in the developed world. Public health officials have warned that heatwaves of this intensity will become more common as the climate warms and that the country is not adequately prepared.

The Met Office says the heatwave is expected to break by the weekend, when a cold front moving in from the Atlantic should bring temperatures back towards the seasonal average. But the respite is expected to be temporary, and forecasters warn that further periods of extreme heat are likely before the end of the summer.