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As summer temperatures continue to push higher across the United Kingdom, a quieter crisis is unfolding behind school gates. Classrooms that were never designed for modern heat levels are becoming stifling, poorly ventilated spaces where children struggle to concentrate, and teachers struggle to teach. In many cases, the issue is not just the weather, but the buildings themselves.
Much of the school estate dates back decades some even over a century and was built for a climate that no longer exists in the same form. Education professionals, teaching unions and parents are warning that many UK schools are increasingly unable to cope with rising temperatures, as ageing buildings with poor ventilation, limited airflow, small opening windows and overcrowded classrooms turn hot weather into a serious disruption to learning.
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According to reports, many UK schools lack air conditioning and rely on makeshift cooling methods such as fans and blinds, with indoor temperatures in some cases reaching levels that disrupt lessons or force early closures. Climate scientists and meteorological experts increasingly view heatwaves not as rare events but as a growing and recurring feature of the UK climate, placing additional strain on infrastructure such as schools that were not designed for sustained extreme heat.
The UK has experienced a clear long-term warming trend, with temperatures rising steadily over recent decades and extreme heat events becoming more frequent and intense, meaning recent summers have increasingly included heat episodes that would once have been considered exceptional or rare. The Met Office’s climate monitoring shows that heatwaves and prolonged warm spells are now a more regular feature of the UK climate system than in previous generations, reflecting the broader impact of global warming on national weather patterns.
Meanwhile, guidance from the Department for Education stresses the importance of adequate ventilation, indoor air quality and thermal comfort in schools to ensure safe and effective learning environments, particularly during periods of high temperature, though teaching unions and campaigners argue that implementation remains uneven across the school estate, especially in older buildings where ventilation systems are limited or outdated, leaving many classrooms increasingly vulnerable to overheating.
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The result is a growing mismatch between educational spaces and environmental reality. In classrooms where windows barely open or where opening them provides limited airflow due to poor building design, temperatures can climb quickly once pupils fill the room. The situation is often worse in buildings with flat roofs, limited shading, or older brickwork that absorbs and retains heat.
Many school buildings across the UK were constructed in eras when heatwaves were rare and prolonged high temperatures were not a planning consideration. Victorian and mid-20th century schoolhouses still form a significant part of the estate in both urban and rural areas. These buildings were typically designed to retain heat during colder months rather than manage excess heat during summer.
In practice, this means classrooms often lack mechanical ventilation systems or air conditioning. Instead, they rely on passive airflow windows, doors, and corridor circulation which becomes ineffective when outdoor air is also hot and still. In densely packed classrooms, where pupil numbers have increased over time without equivalent expansion of physical space, heat builds rapidly.
Public health advice from the NHS highlights that excessive heat can lead to dehydration, heat exhaustion, and worsening of pre-existing health conditions. Through the NHS Heat Exhaustion Guidance outlines symptoms such as dizziness, fatigue, headaches, and nausea, all of which can be particularly concerning in school settings where young children may not recognise or communicate discomfort early.
Despite this, many schools are left relying on improvised measures: blinds drawn during heat peaks, classroom doors propped open for airflow, or temporary adjustments to timetables. In some cases, physical education and outdoor activities are rescheduled or cancelled entirely during extreme heat periods. The UK Government School Building Guidance outlines expectations for maintaining safe and suitable learning environments, including ventilation standards. However, education unions argue that funding constraints and ageing infrastructure limit schools’ ability to make meaningful upgrades at scale.
Compounding the issue is the fact that many school refurbishments prioritise insulation for winter efficiency rather than cooling for summer resilience. While this is beneficial during colder months, it can inadvertently trap heat during warmer periods, particularly in buildings without cross-ventilation or external shading.
The tension between energy efficiency and thermal comfort is becoming more visible as climate patterns shift. Buildings designed to conserve heat now often struggle to release it, creating environments that can become uncomfortable within hours of occupancy during hot weather.
Educational research consistently shows that high indoor temperatures can significantly disrupt learning, with peer-reviewed studies published in SAGE journals demonstrating that thermal discomfort in classrooms reduces cognitive performance, including attention, memory retention and task accuracy. A meta-analytic study published in Building and Environment finds that rising classroom temperatures are strongly associated with declines in students’ ability to complete academic tasks, including mathematical and language-based work, with optimal performance occurring at lower, stable temperatures rather than heat-stressed conditions.
In practical terms, this evidence shows that prolonged exposure to warmer classroom environments can reduce learning efficiency and test performance, particularly during sustained academic periods such as exam preparation, when concentration and memory recall are most critical for outcomes.
The Met Office has repeatedly highlighted that heatwaves in the UK are no longer rare anomalies but recurring seasonal risks. Their climate monitoring shows increasing frequency of days where temperatures exceed thresholds historically associated with southern Europe rather than northern Europe. This shift has prompted wider discussion about how public infrastructure including schools, hospitals, and care homes must adapt.
Yet adaptation is uneven. While some newer school buildings incorporate modern ventilation systems, shading structures, and heat-resistant materials, many older schools remain unchanged. Funding for large-scale retrofitting is limited, and schools often prioritise urgent repairs such as roofing, plumbing, and safety compliance over climate adaptation.
Local authorities and school trusts face difficult decisions about resource allocation, often balancing immediate operational needs against long-term environmental resilience. In this context, heat mitigation measures such as installing air conditioning or advanced ventilation systems are frequently delayed or deemed unaffordable.
Government guidance from the Department for Education stresses the importance of safe learning environments, and encourages schools to consider thermal comfort in design and refurbishment projects. Campaigners argue that without targeted funding streams, guidance alone is insufficient to address systemic issues.
There is growing awareness among parents about the conditions children face during hot weather. Concerns are not limited to comfort, but also to safeguarding, particularly for pupils with asthma, heart conditions, or other medical vulnerabilities that can be exacerbated by heat stress.
Climate health resources, including those from the Met Office and the NHS, increasingly emphasise the importance of hydration, ventilation, and avoiding prolonged exposure to high indoor temperatures. Yet implementing these principles consistently in school environments remains challenging without structural change.
Experts warn that reliance on temporary fixes may no longer be sufficient. Instead, a broader rethinking of school design may be required one that treats overheating not as an occasional inconvenience, but as a predictable and recurring condition that buildings must be designed to withstand. However, many pupils across the UK will continue to sit in classrooms that swelter under heat that their schools were never built to handle, learning in conditions that increasingly feel out of step with the climate of the present day.
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