citiesabc, first_page
The 10 UK Cities Where Homes May Struggle Most in Extreme Heat
11 Aug 2026
London tops a new ranking of UK cities exposed to extreme heat, as record temperatures, ageing housing, limited urban greenery and rising overheating risks put the resilience of British homes under growing scrutiny.
Extreme heat is rapidly becoming an urban resilience challenge for the United Kingdom.
A new August 2026 study by Tradefix Direct has identified ten UK cities where homes may be particularly exposed when temperatures climb, with London, Peterborough and Cambridge occupying the top three positions.
The research comes during another remarkable year for British temperatures. The Met Office reported that England experienced its warmest June on record in 2026, while the UK registered a new June maximum-temperature record of 38.0°C at Lingwood on 26 June. By mid-July, 2026 had already recorded more UK days above 30°C than the entire summer of 1976.
The implications extend far beyond uncomfortable summer afternoons. Extreme heat raises questions about housing design, ventilation, urban green infrastructure, public health and how cities built for a traditionally temperate climate will adapt to a warmer future.
The UK Cities Most Exposed to Extreme Heat
Tradefix Direct ranked cities primarily according to the hottest temperature recorded in the study's dataset. Housing age, green-space coverage, humidity and historical mean maximum temperatures were included as supporting indicators.
| Rank | City | Homes Built Before 1919 | Green Space | Average Humidity | Mean Daily Max Temperature (1991–2020) | Hottest Day in Study |
|---|---|---|---|---|---|---|
| 1 | London | 21.9% | 18.29% | 72% | 23.9°C | 40.2°C |
| 2 | Peterborough | 10.7% | 23.16% | 42% | 22.7°C | 39.9°C |
| 3 | Cambridge | 18.0% | 14.18% | 46% | 23.3°C | 39.9°C |
| 4 | Nottingham | 17.4% | 20.68% | 33% | 21.8°C | 39.8°C |
| 5 | Leeds | 17.3% | 16.38% | 40% | 21.3°C | 39.8°C |
| 6 | Milton Keynes | 5.8% | 20.43% | 54% | 22.8°C | 39.6°C |
| 7 | Sheffield | 19.0% | 17.07% | 37% | 21.4°C | 39.4°C |
| 8 | York | 16.7% | 12.15% | 36% | 21.5°C | 39.3°C |
| 9 | Chelmsford | 7.8% | 19.32% | 50% | 23.0°C | 39.1°C |
| 10 | Derby | 17.3% | 15.25% | 36% | 21.8°C | 39.0°C |
Source: Tradefix Direct, August 2026.
It is important to distinguish the figures in the study from official national temperature records. While London reaches 40.2°C in the dataset, the Met Office confirms that the UK's official all-time temperature record is 40.3°C, recorded at Coningsby in Lincolnshire on 19 July 2022.
1. London: Extreme Heat Meets a Dense Urban Environment
London ranks first, with the study recording a maximum temperature of 40.2°C.
The capital combines several characteristics relevant to heat resilience. Around 21.9% of its properties in the dataset were built before 1919, green-space coverage stands at 18.29%, and its recorded average humidity is the highest among the ten cities at 72%.
London's challenge is not simply temperature. Dense development, extensive hard surfaces, building configuration and the urban heat-island effect can all influence how quickly neighbourhoods heat up and, crucially, how slowly they cool after sunset.
Heat resilience therefore needs to be considered as much at street and neighbourhood level as at building level.
2. Peterborough: Newer Housing Does Not Remove the Risk
Peterborough ranks second after reaching 39.9°C.
Only 10.7% of properties in the study were built before 1919, significantly below London's figure, while green space covers 23.16%.
Its position demonstrates an important point: housing age alone cannot explain overheating risk.
Modern buildings can also overheat depending on insulation, glazing, orientation, ventilation, floor level and the ability of occupants to block solar heat during the day and release accumulated heat at night.
3. Cambridge: High Temperatures and Limited Green Space
Cambridge also reached 39.9°C, according to the research.
Its green-space figure of 14.18% is among the lowest in the top ten, while 18% of properties were built before 1919.
Urban vegetation can play an important role in climate adaptation. Trees provide shade while vegetation and soil can help reduce local temperatures through evapotranspiration. Consequently, city strategies around tree canopy, parks, green corridors and the design of public space increasingly intersect with heat resilience.
4. Nottingham: Cooler Averages Do Not Prevent Extremes
Nottingham recorded 39.8°C, despite having a mean daily maximum of 21.8°C in the study.
The contrast illustrates why historical averages alone can provide an incomplete picture of climate risk.
Homes and infrastructure need to cope not only with typical summer conditions but also with increasingly severe temperature spikes.
Approximately 17.4% of Nottingham's housing in the dataset predates 1919, while green space accounts for 20.68%.
5. Leeds: Traditionally Cooler Cities Are Not Immune
Leeds also reached 39.8°C in the study.
Its mean daily maximum temperature of 21.3°C is among the lowest within the top ten, yet its extreme-temperature figure is nearly 40°C.
For northern cities that historically designed homes, infrastructure and public spaces around cooler conditions, increasingly severe heat events could require a significant change in assumptions around urban planning and building performance.
6. Milton Keynes
Milton Keynes recorded a study high of 39.6°C.
Only 5.8% of its properties were built before 1919, the lowest figure in the top ten, while green space accounts for 20.43%.
Its inclusion again highlights that newer housing stock is not automatically protected from overheating. Building form, large windows, solar gain and limited opportunities for cross-ventilation can make some newer dwellings vulnerable during prolonged periods of heat.
7. Sheffield
Sheffield ranks seventh at 39.4°C.
Around 19% of properties in the study were constructed before 1919, while green-space coverage stands at 17.07%.
The city's presence alongside southern locations demonstrates the increasingly national character of Britain's heat challenge.
8. York: Lowest Green-Space Share in the Top Ten
York reached 39.3°C, but perhaps its most notable indicator in the research is its 12.15% green-space coverage — the lowest of all ten cities.
The figure raises a broader question facing planners worldwide: how much urban land should be dedicated to natural cooling infrastructure?
Trees, vegetation, parks, water features, shaded streets and green roofs are increasingly being treated as infrastructure rather than simply aesthetic amenities as cities prepare for hotter conditions.
9. Chelmsford
Chelmsford recorded 39.1°C, with a comparatively high mean daily maximum of 23°C.
Only 7.8% of properties in the study were built before 1919, while green-space coverage reaches 19.32%.
Its relatively modern housing profile suggests once again that a city's exposure to heat cannot be reduced to the age of its buildings.
10. Derby
Completing the top ten is Derby, where the study records a peak temperature of 39.0°C.
Around 17.3% of homes were built before 1919, with green space covering 15.25% of the city.
Together, the ten locations illustrate how extreme heat can intersect with very different urban forms, housing profiles and local climates.
Britain's Overheating Problem Is Already Visible
The wider evidence suggests that residential overheating is moving from a future climate scenario to a present-day housing challenge.
The English Housing Survey 2024–25, published in July 2026, found that approximately 3 million homes reported overheating in 2024. The proportion of occupied homes where residents reported overheating had increased from 7% in 2019 to 12% in 2024.
That trend is especially significant because Britain's housing was historically designed primarily around keeping occupants warm rather than preventing dangerous summer temperatures.
The UK Health Security Agency warns that hot homes can worsen health conditions and can, in serious circumstances, become dangerous. Its guidance identifies characteristics including restricted ventilation, large areas of glazing and homes that retain heat as factors that can increase overheating risk.
Meanwhile, the Climate Change Committee has repeatedly warned that Britain's adaptation to rising temperatures is progressing too slowly.
In its 2025 Progress in Adapting to Climate Change report, the Committee concluded that the UK's preparations for climate change remained inadequate. It was unable to evaluate nationwide progress on preventing buildings from overheating because sufficiently comprehensive datasets on the existing building stock were still lacking.
That gap matters. Without measuring what is happening inside homes, policymakers can struggle to identify the neighbourhoods, building types and residents most exposed to dangerous temperatures.
Older Homes Are Only One Part of the Story
The Tradefix Direct analysis uses the proportion of homes built before 1919 as one contextual indicator. However, age should not be interpreted as a straightforward measure of overheating vulnerability.
Government housing research has found that newer homes can also experience significant overheating.
A home's summer performance depends on a combination of characteristics: orientation, insulation, thermal mass, window size, shading, ventilation, occupancy patterns and the ability to release heat overnight.
Older buildings may present retrofit challenges, but modern highly insulated dwellings can also trap heat when solar gains are high and ventilation is inadequate.
This means effective adaptation needs to focus on building performance, rather than assuming that one particular generation of homes is universally most vulnerable.
From Energy Efficiency to Climate Resilience
For decades, British housing policy has understandably concentrated on winter warmth and energy efficiency.
Extreme heat adds another dimension.
Insulation remains critical for reducing energy consumption and winter fuel demand, but retrofit programmes increasingly need to consider year-round thermal performance. Measures intended to retain heat in winter should be designed alongside ventilation, shading and other approaches that reduce overheating in summer.
England introduced Building Regulations Part O in 2022 to reduce overheating risk in new residential buildings.
The much larger challenge is the millions of homes that already exist.
Research commissioned by the Climate Change Committee concluded that significant retrofit work could be required across Britain's housing stock as the climate warms.
Potential interventions range from relatively simple measures, external shading, shutters, reflective surfaces and improved ventilation, to more structural changes involving windows, roofs, façades and surrounding urban landscapes.
Green Infrastructure Will Become Essential City Infrastructure
The ranking also highlights another component of heat resilience: green space.
Urban trees and vegetation can shade buildings and streets while helping reduce local temperatures. At city scale, connected parks, tree canopies, green roofs and other nature-based infrastructure can help counter some of the effects associated with heavily built-up environments.
For cities such as York and Cambridge, which have some of the lowest green-space percentages in the Tradefix dataset, the relationship between development and natural cooling deserves particular attention.
The future smart city may therefore be defined not only by sensors, AI platforms and digital infrastructure, but by how effectively technology is integrated with trees, parks, water, architecture and climate-responsive urban design.
2026 Is Reinforcing the Warning
The timing of the research is particularly relevant.
The Met Office confirmed 2025 as the UK's warmest year on record, with a mean temperature of 10.09°C.
The following year has already delivered further milestones.
England experienced its warmest June on record in 2026. A temperature of 38.0°C at Lingwood on 26 June established a new official UK June daily maximum, while temperatures of at least 35°C were recorded during May, June and July of the same year for the first time in the UK's observational record.
These records do not mean every British summer will continually become hotter than the previous one. They do, however, sit within a long-term trend towards higher temperatures and more severe heat extremes.
Building the Heat-Resilient City
The lesson from the Tradefix Direct ranking extends beyond identifying which city occupies first or tenth place.
The more important question is whether Britain's housing and urban infrastructure are evolving rapidly enough for a climate in which temperatures approaching 40°C can no longer be dismissed as unimaginable.
Cities will need to combine building retrofit, climate-responsive construction, urban greening, better heat-risk mapping, public-health planning and data-driven monitoring.
Local governments may also need increasingly granular information. Heat vulnerability can change dramatically from one neighbourhood — or even one building — to another.
Smart-city technologies could help identify overheated buildings, model urban heat islands, prioritise tree planting and monitor vulnerable infrastructure. But technology alone will not solve the problem. Physical urban design will remain fundamental.
The cities of the future will need to become intelligent in two senses: digitally connected and environmentally adaptive.
As Britain's temperature records continue to fall, keeping cities liveable will increasingly depend on treating heat resilience not as an emergency response to an occasional heatwave, but as a permanent element of housing, infrastructure and urban policy.
Sources
- Tradefix Direct — Original August 2026 Research Dataset
https://docs.google.com/spreadsheets/d/e/2PACX-1vQvht9YUcaAkqaDRx7Hl4-kUKN07Pl8s2805pdKAui9pc3rJOPBlNtIixJpv-uaj-wLsDi4_u7R4LgP/pubhtml - Tradefix Direct
https://tradefixdirect.com/ - Met Office — UK Climate Extremes and Official Temperature Records
https://www.metoffice.gov.uk/research/climate/maps-and-data/uk-climate-extremes - Met Office — Record High Temperatures Verified, July 2022
https://www.metoffice.gov.uk/about-us/news-and-media/media-centre/weather-and-climate-news/2022/record-high-temperatures-verified - Met Office — England's Warmest June on Record, 2026
https://www.metoffice.gov.uk/about-us/news-and-media/media-centre/weather-and-climate-news/2026/englands-warmest-june-on-record--the-second-warmest-for-the-uk-and-wales- - Met Office — New June Daily Temperature Record Verified, 2026
https://www.metoffice.gov.uk/about-us/news-and-media/media-centre/weather-and-climate-news/2026/new-june-daily-temperature-records-heading-into-the-record-books - Met Office — 2025 Is the UK's Warmest and Sunniest Year on Record
https://www.metoffice.gov.uk/about-us/news-and-media/media-centre/weather-and-climate-news/2026/2025-is-double-record-breaker-uks-warmest-and-sunniest-year-on-record - UK Government — English Housing Survey 2024–25: Weather Resilient Homes
https://www.gov.uk/government/statistics/english-housing-survey-2024-to-2025-weather-resilience-in-housing-fact-sheet/english-housing-survey-2024-to-2025-weather-resilient-homes-fact-sheet - UK Health Security Agency — Beat the Heat: Keep Cool at Home Checklist
https://www.gov.uk/government/publications/beat-the-heat-hot-weather-advice/beat-the-heat-keep-cool-at-home-checklist - Climate Change Committee — Progress in Adapting to Climate Change: 2025 Report to Parliament
https://www.theccc.org.uk/publication/progress-in-adapting-to-climate-change-2025/ - Climate Change Committee / Arup — Addressing Overheating Risk in Existing UK Homes
https://www.theccc.org.uk/publication/addressing-overheating-risk-in-existing-uk-homes-arup/ - UK Government — Approved Document O: Overheating
https://www.gov.uk/guidance/approved-document-o-overheating-frequently-asked-questions
Share
Sara Srifi
Sara is a Software Engineering and Business student with a passion for astronomy, cultural studies, and human-centered storytelling. She explores the quiet intersections between science, identity, and imagination, reflecting on how space, art, and society shape the way we understand ourselves and the world around us. Her writing draws on curiosity and lived experience to bridge disciplines and spark dialogue across cultures.
