The Met Office has issued an unprecedented warning about the possibility of 45C heatwaves in the UK as an intense heatwave currently grips the nation. Red extreme heat warnings signal the threat to public health, infrastructure, and everyday life as record-breaking temperatures are expected to shatter longstanding UK June records.
Scientists from the Met Office emphasize that future heatwaves could grow dramatically more severe. A plausible scenario projects UK temperatures reaching 45C by 2056, driven by around 2.5C of global warming.
Professor Stephen Belcher CBE, the Met Office’s chief scientist, commented: “This heatwave will be a significant weather event with serious implications. Human-induced climate change has increased the likelihood and severity of such extremes. Seeing such temperatures in the UK in June is sobering.” He highlighted the serious health risks heat stress poses and noted impacts on sectors like transport, energy, and water supplies.
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This warning coincides with the 50th anniversary of the notorious 1976 summer heatwave, one of the most impactful weather events in UK history, marked by prolonged heat and drought. To commemorate, the Met Office developed a “2056 scenario” based on climate projections showing how a similar heatwave could intensify in a warmer future.
According to this projection, temperatures could soar to 45C in England, 41C in Wales, 38C in Scotland, and 30C in Northern Ireland. The scenario also envisions a prolonged two-week heatwave with nine consecutive days exceeding 40C somewhere in the UK — a stark illustration of potential future extremes.
Professor Belcher added, “Our climate has fundamentally changed since 1976, with average UK summers warming about 1.4C already. Extremes have shifted as well. This scenario is not a forecast but a scientific glimpse into future risks.”
Supporting research reveals that a heatwave like 1976 would be approximately 3C hotter in today’s climate. Professor Ed Hawkins MBE from the University of Reading noted, “Heatwaves like 1976 occurred in a cooler climate. With global temperatures rising, these events are becoming both more frequent and more intense.”
The 1976 heatwave’s legacy included record temperatures, drought, widespread water restrictions, and major strain on infrastructure. Images of standpipes in streets became a somber symbol of the crisis.
The Met Office stresses that current conditions already reflect many of these risks under the red warning, especially for vulnerable populations and critical services. Scientists warn that future heatwaves could exacerbate health risks, water shortages, wildfire dangers, and disruptions in food production.
Professor Hayley Fowler FRS of Newcastle University said, “Heatwaves like 1976 affected more than just temperatures—they caused drought, water scarcity, and major impacts on daily life. In a warming climate, these issues will become even more severe.”