The UK experienced its warmest day of 2026 on Thursday, with temperatures soaring to a provisional 36.7C (98.1F) in Merryfield, Somerset. This landmark figure makes it the hottest June temperature recorded in the UK, surpassing previous records and potentially leading to the hottest June night ever.

A rare red warning for extreme heat, issued by the Met Office, remains in effect for southern, central, and western England, as well as parts of Wales, highlighting the significant danger to life posed by the conditions. This warning has been extended for a third consecutive day, impacting millions, including residents in London and parts of south-eastern England.

During this intense heatwave, various measures have been implemented to cope with the extreme conditions. Schools have closed their doors, a hosepipe ban is in effect for residents in Kent, and train services have faced significant disruptions. The heatwave's impact is widespread, affecting daily routines and infrastructure.

This extreme weather event follows a pattern of increasingly severe heat. On Wednesday, the UK recorded its warmest June night on record, with overnight temperatures in Cardiff failing to drop below 23.5C, breaking the 1976 record of 22.7C. Forecasters warn that Thursday night could see this record surpassed again.

All four nations of the UK recorded their highest temperatures of the year on Thursday. Wales saw a provisional 35.6C in Bute Park, Cardiff, its hottest June day on record. Scotland reached 31.2C in Threave, Dumfries and Galloway, while Northern Ireland recorded 30C in Castlederg, County Tyrone.

These extreme temperatures are attributed to a 'heat dome,' a mass of high pressure that traps heat over western Europe, leading to severe conditions across the continent. Scientists emphasize that climate change is significantly exacerbating these events, making heatwaves more intense and frequent.

Data from the Met Office indicates a stark increase in high-temperature days, with the number of days exceeding 30C between 2015 and 2024 more than tripling compared to the 1961-1990 average. This trend underscores the growing impact of climate change on the UK's weather patterns.

The Met Office has advised the public to expect adverse health effects, including serious illness or danger to life, and has called for substantial changes in working practices and daily routines. Concerns have also been raised about the potential failure of heat-sensitive systems and transport delays.