The average high temperature in London at the end of May is around 68 degrees Fahrenheit. On Monday May 25 it hit 94.6 degrees. On Tuesday May 26 it hit 95.2 degrees, recorded at Kew Gardens by the UK Met Office. The May temperature record for England and Wales, a record that had stood for a very long time, was broken twice within 24 hours. The overnight temperature in parts of London did not fall below 70 degrees, what meteorologists call a tropical night, which has essentially never happened in the UK before in May.
Across the Channel, France was worse. Parts of the country hit 99 degrees Fahrenheit. Deaths were reported as the heat became dangerous for vulnerable people. Spain pushed past 100 degrees in some areas. Scotland, which rarely features in heatwave coverage, saw a wildfire break out near Arthur's Seat, the hill overlooking Edinburgh. Hundreds of properties in southeast England lost water supply as demand spiked beyond what the infrastructure was designed to handle.
This is not a normal weather event being described in dramatic terms. The records being broken here are genuinely extraordinary. Scientists who study extreme weather are using language they do not usually use. CNN quoted one expert describing the situation as mind-bogglingly crazy. That is not a phrase climate scientists reach for lightly.
What is causing the Europe heatwave 2026
The mechanism behind this heatwave is a heat dome, a high pressure system that sits over a region and traps warm air underneath it, preventing the normal flow of cooler Atlantic weather that western Europe typically relies on. This particular dome is sitting over western Europe and pulling extremely hot air up from North Africa and the Sahara. The result is temperatures that are not just above normal but in a completely different category from anything this part of the continent has recorded in May before.
What makes the 2026 Europe heatwave significant beyond the immediate record-breaking is the timing. A heatwave of this intensity in late May, before summer has even officially started, gives the continent very little room before the actual summer months arrive. Soil is already dry. Rivers are already low. The wildlife and plant systems that buffer against heat have not had the usual gradual transition. When July and August arrive with their own heat events on top of a depleted May, the cumulative effect is significantly worse than a single isolated summer heatwave would be.
Why this is especially dangerous in the UK
The United Kingdom is not built for heat. That is not a criticism, it is a physical fact about the housing stock and infrastructure of a country that developed over centuries in a cool, damp climate. Approximately five percent of UK homes have air conditioning. Houses are insulated to keep heat in during the long winters, which means in extreme summer heat they trap warmth inside and become dangerously hot. Opening windows at night to cool a house down, the standard UK method of managing hot weather, does not work when overnight temperatures stay above 70 degrees.
The result is that heat events which would be uncomfortable but manageable in countries with widespread air conditioning become genuinely life-threatening in the UK for elderly people, young children, and anyone with underlying health conditions. The government issued warnings about risks to life during the May 2026 heatwave, which is language that gets used sparingly and only when the situation warrants it.
Several drownings were reported in both Britain and France as people tried to cool down in rivers, lakes and reservoirs. These drownings are a consistent and tragic feature of UK heatwaves. When the infrastructure for staying cool does not exist and the heat becomes unbearable, people make decisions about water that they would not normally make, often with fatal consequences.
What scientists are saying
Climate scientists have been clear and consistent on what is happening here. This is climate change in the form that the models have been predicting for years, now arriving in observable, measurable reality. Europe is the fastest-warming continent on earth. Data from the EU's Copernicus climate service and the World Meteorological Organization shows that European temperatures have been rising at roughly twice the global average rate. The continent is now regularly experiencing weather that would have been considered extreme outliers under historical climate patterns.
The specific framing that scientists use for events like the 2026 Europe heatwave is attribution science. Studies done in the immediate aftermath of major heat events have consistently shown that the probability of such events occurring would be extremely low in a world without the additional warming from greenhouse gas emissions. In plain language, this heatwave would very likely not be happening, or would be far less extreme, if the global temperature had not already risen by around 1.3 degrees Celsius above pre-industrial levels.
The May timing is what scientists find most alarming about the 2026 event. The 2025 European heatwaves, which caused an estimated 16,500 deaths across the continent, peaked in July and August. The 2026 event is arriving six to eight weeks earlier. If the pattern continues, genuinely dangerous heat will arrive in spring and extend deep into autumn, dramatically lengthening the window during which vulnerable people face life-threatening conditions.
How this compares to previous European heatwaves
The 2003 European heatwave killed an estimated 70,000 people and was at the time considered a once-in-a-century event. Since then there have been major heatwaves in 2019, 2022, 2023, 2024 and 2025. The once-in-a-century event has happened every few years. The 2022 UK heatwave saw temperatures reach 40.3 degrees Celsius at Coningsby in Lincolnshire, the first time 40 degrees had ever been recorded in the UK. That record had stood less than four years before the 2026 May event arrived.
The pattern is not subtle. Records that were considered extraordinary when they were set are being exceeded, sometimes within a few years. The direction of travel is clear and the pace is not slowing down. The 2026 May heatwave in Europe is not an anomaly in a stable climate. It is the latest data point in a trajectory that climate scientists have been documenting and warning about for decades.
What is different about the current moment is that the events are now happening in real time, at a frequency and intensity that makes it difficult to dismiss them as isolated incidents. People across Europe who lived through the 2022 heatwave, then the 2023 heatwave, then the 2025 summer that killed an estimated 16,500 people, are now experiencing another record-breaking event less than a year later, in May rather than July.
The once-in-a-century heatwave has now happened several times in the last decade. At some point the phrase stops meaning anything and the question becomes what we actually plan to do about the infrastructure, the housing stock, and the health systems that are not built for this reality.
What happens next and what the summer forecast says
According to the US National Oceanic and Atmospheric Administration, NOAA, a hot summer is forecast across most of the United States regardless of what happens in Europe. The two events are not directly linked, with forecasters saying there is no clear connection between the Europe heat event and what North America will experience in the coming weeks. However, a hot summer on top of an already depleted water table and dry vegetation from the May heatwave in Europe will amplify whatever the continent faces in July and August.
For the United Kingdom specifically, the Met Office has not issued a long-range forecast suggesting an unusually hot summer, but the baseline has shifted enough that what would have been considered a hot summer ten years ago is now a moderate one. The May records that were broken this week were broken by around 2 degrees Celsius, which is not a small margin. These are not close-run records being nudged upward by fractions. The gap between what used to be normal and what is now being recorded is significant and growing.
The immediate practical concerns following the May 2026 heatwave include water supply resilience, which was visibly strained in southeast England, wildfire preparedness, which clearly needs to extend further north into Scotland than previously planned, and public health infrastructure for vulnerable people during extended heat events. Whether governments act on any of these at a meaningful scale before the next event arrives is the question that emergency planners are asking and that the public should probably be asking too.
A note on this coverage
This post is based on reporting by CNN, NPR, Scientific American and The Weather Network, all published between May 25 and 27 2026. The temperature figures cited are from the UK Met Office. Where scientists are quoted, the attributions are accurate to the source reporting. This is a fast-moving story and conditions may have changed since publication.