The United Kingdom recorded its hottest June day on record on Saturday, with temperatures reaching 36°C in parts of southern England. The reading, confirmed by the Met Office, surpasses the previous June high of 35.6°C set in Southampton in 1976. The milestone comes as a rare red warning for extreme heat — the highest level of alert — remains active across parts of central and eastern England, signaling a potential risk to life and significant disruption to infrastructure.
On June 29, weather stations across southern and central England registered unprecedented early-summer heat. The 36°C mark was recorded at Wisley in Surrey, with several other locations — including Heathrow, Kew Gardens, and Northolt — exceeding 35°C. The Met Office issued the red warning for extreme heat covering an area stretching from London north to Manchester and east to the Lincolnshire coast, effective from midday Saturday through Sunday evening. This is only the second time a red heat warning has been issued since the system was introduced in 2021, the first being during the July 2022 heatwave when temperatures topped 40°C for the first time in UK history.
June heatwaves of this intensity are historically rare in the UK. The previous June record of 35.6°C had stood for 47 years, and average late-June highs in southern England typically sit in the low 20s. Meteorologists attribute the spike to a plume of hot air drawn north from North Africa and the Iberian Peninsula, amplified by high pressure and strong June sunshine. Climate scientists note that while individual weather events cannot be solely attributed to climate change, the frequency, intensity, and duration of heatwaves are increasing globally due to human-driven warming. The UK’s 10 warmest years on record have all occurred since 2002.
The red warning means adverse health effects are likely across the population, not just among vulnerable groups. The UK Health Security Agency has issued a Level 4 heat-health alert — its highest — urging people to look out for older relatives, young children, and those with underlying conditions. Rail operators have imposed speed restrictions on tracks at risk of buckling, leading to cancellations and delays. Schools in some areas have closed early or moved lessons online. The NHS has reported increased demand for heat-related illnesses, and water companies have urged restraint to avoid supply issues. Employers are advised to allow flexible working and ensure cool rest areas.
Temperatures are expected to peak on Saturday and Sunday before a cold front brings thunderstorms and a sharp drop early next week. However, the Met Office warns that the breakdown of the heat may bring localized flooding and travel disruption. Looking ahead, climate projections suggest summers like this — and hotter — will become more common. The UK’s Climate Change Committee has warned the country is unprepared for rising heat risk, particularly in housing, healthcare, and transport. For now, the message is clear: stay hydrated, avoid exertion in peak sun, and check on neighbors. The record may fall again before the decade is out.
Image: Photo: Alec Doualetas · Pexels
Based on reporting from bbc.co.uk.
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