The United Kingdom recorded its hottest May day in at least 79 years on Sunday, with temperatures breaching records across England, Wales, Northern Ireland and Scotland as a powerful early-summer heatwave settled over western Europe. Kew Gardens in west London reached 32.3°C (90.1°F), while Cardiff hit 27.4°C and Armagh 23.4°C. Edinburgh came within a fraction of Scotland's May record, reaching 23.5°C — just 0.1°C short of the all-time Scottish May high. The previous Saturday had already marked the earliest 30°C day in the UK since 1952.
Several locations in south-east England officially crossed the heatwave threshold — defined by the Met Office as temperatures exceeding a set level for three consecutive days, with the bar varying by region. In London and surrounding counties the threshold is 28°C, while for much of England and south-east Wales it sits at 26°C or 27°C. Areas now formally in heatwave conditions include Santon Downham in Suffolk, Heathrow, Kew Gardens and Northolt in London, and sites in Oxfordshire and Essex. Forecasters warned temperatures could climb further on Monday, potentially reaching 33°C to 34°C. Across the Channel, the French national weather agency Météo-France noted that periods of exceptional heat are becoming more frequent, more premature and more intense — a pattern evident as Paris also sweltered during the opening days of the Roland-Garros tennis tournament.
The Met Office linked the records directly to climate change, noting that breaking the previous May temperature record of 32.8°C is now roughly three times more likely than it would have been before the Industrial Revolution. "What was around a one-in-100-year event is now around a one-in-33-year event," a spokesperson said. The UK Health Security Agency issued amber heat alerts for London, the east of England, the East and West Midlands, and the south-east, cautioning of heightened risk for people over 65 and those with respiratory or cardiovascular conditions. The alerts are set to remain in place until Wednesday.
The heat drew large crowds to beaches, parks and open water, but also brought tragedy. Emergency services in Lincoln were called to Swanholme Lakes after a 15-year-old boy got into difficulty in the water; his body was later recovered and identified as Declan Sawyer. Water safety experts urged the public to exercise caution around lakes, rivers and quarries, warning that cold water shock poses a serious danger even on warm days. Data from the National Water Safety Forum shows that May is statistically the deadliest month for inland water fatalities, with 28 deaths recorded in May 2024 alone. Experts advised anyone in difficulty to adopt the "float to live" technique — lying back, tilting the head and conserving energy until breathing stabilises — and urged bystanders not to enter the water themselves but to call emergency services and throw a flotation aid.
The wider disruption of the weekend's heat was felt across public life. Drinks breaks were taken during Premier League football's final fixtures and the League One playoff final at Wembley stadium. The Marylebone Cricket Club temporarily relaxed its famously strict dress code at Lord's cricket ground in London. In Kent, residents of three villages near Ashford — Charing, Challock and Molash — faced a second day of water shortages after pumping station failures at South East Water, a reminder that infrastructure as well as human health faces growing strain as extreme heat events become an increasingly routine feature of the European spring.