Why 35°C in Britain Feels More Oppressive Than 45°C in India: Climate Scientists Explain

Britain's recent heatwave, with temperatures reaching around 35°C, has led to school closures, health warnings and pressure on public infrastructure, leaving many people wondering why conditions can feel more unbearable than the 45°C temperatures regularly experienced in parts of India. Experts explain that the human body responds to far more than just the number displayed on a thermometer. Factors such as humidity, overnight temperatures, housing design, urban infrastructure and long-term adaptation all influence how hot weather is actually experienced.

One of the biggest reasons lies in geography and climate. Britain is located between 50° and 60° north latitude and is surrounded by the Atlantic Ocean, the North Sea and the English Channel, giving it a temperate maritime climate with relatively high humidity throughout the year. India, by contrast, lies largely within the tropical and subtropical zones, where extremely hot summers are an expected annual occurrence. As a result, both people and infrastructure in India are better prepared to cope with prolonged periods of intense heat.

Humidity plays a crucial role in determining how hot conditions feel. The human body cools itself by producing sweat, but this process only works effectively when sweat evaporates from the skin. In humid environments like Britain, moisture in the air slows evaporation, making it harder for the body to release heat. This increases the risk of dehydration, heat exhaustion and heatstroke. Meteorologists therefore often rely on the "wet-bulb temperature", which combines air temperature and humidity, to better measure the stress heat places on the human body.

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Another major factor is the design of buildings. Most British homes were constructed to retain warmth during long, cold winters, with insulated walls, limited natural ventilation and very little use of air conditioning. During heatwaves, these buildings absorb heat during the day and release it slowly at night, keeping indoor temperatures uncomfortably high. In contrast, many Indian homes are designed to stay cool through features such as ceiling fans, cross-ventilation, shaded courtyards and increasingly widespread use of air conditioners.

Human adaptation also makes a significant difference. In India, temperatures rise gradually through spring before reaching their peak in May and June, allowing the body time to adapt by improving its ability to sweat efficiently, regulate body temperature and conserve essential salts. Britain's heatwaves often arrive suddenly after weeks of relatively cool weather, leaving residents with little opportunity to acclimatise. Daily routines in India also commonly involve avoiding outdoor activities during the hottest hours, whereas British infrastructure and public services have historically been built around much cooler conditions.

Climate experts also point to the impact of warm nights. Britain's long summer daylight hours allow roads, buildings and pavements to absorb heat for extended periods before slowly releasing it after sunset. When overnight temperatures remain above 20°C, often referred to as "tropical nights", the human body gets little chance to cool down and recover from daytime heat exposure. As climate change increases the frequency and intensity of European heatwaves, scientists say Britain's infrastructure, housing and public services are facing growing challenges in adapting to weather conditions for which they were never originally designed.

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