June 23, 2026 - 188 views
A rare and dangerous spell of extreme heat is set to grip Wales this week, with the Met Office issuing a red warning for extreme heat for the first time ever across parts of the country.
The alert will be in force from 09:00 on Wednesday until 21:00 on Thursday, marking the most severe level of weather warning, indicating a high risk to life and significant disruption to essential services.
Forecasters are warning that temperatures could climb well beyond 37C (99F) in shaded areas, with some locations potentially reaching 38C to 40C (100–104F) at the peak of the heatwave. Officials say the conditions will be both exceptionally hot and humid, increasing health risks, particularly for the elderly, young children, and those with underlying health conditions.
The red warning covers large parts of south and mid Wales, including areas such as Cardiff, Swansea, Newport, Bridgend, and the Valleys, while amber heat health alerts have been extended across the whole of Wales for four days. The amber warnings highlight widespread pressure on health services, transport, and infrastructure.
North Wales is also expected to experience extreme conditions, with temperatures forecast to reach between 32C and 35C on Thursday, making it one of the hottest periods of the year for the region.
The Met Office has warned the heat could lead to disruption to roads and rail services, potential power outages, and increased pressure on emergency services. Authorities are urging people to avoid unnecessary travel, stay out of direct sunlight during the middle of the day, keep hydrated, and check on vulnerable neighbours.
The RSPCA has also issued advice for pet owners, warning that animals are particularly at risk in prolonged high temperatures and should be kept cool and out of hot environments.
First Minister Rhun ap Iorwerth said a Welsh Government response group has been established to monitor the situation closely and coordinate emergency planning across affected areas, with updates to be issued as conditions develop.
The UK’s first ever red heat warning was previously issued in England in July 2022, when temperatures exceeded 40C for the first time, highlighting how rare and serious this level of alert remains.
With temperatures expected to remain elevated through the week, officials say the coming days could place unprecedented strain on daily life across Wales.
