Stepping outside across large parts of India during the summer of 2026 has become more than merely uncomfortable—it has become dangerous. Between mid-April and May, temperatures repeatedly climbed above 46°C across vast regions of the country, with many areas recording readings that were 5°C to 8°C higher than seasonal averages. In one of the most extreme cases, Balangir reached a blistering 48°C. By late April, an astonishing 98 of the world’s 100 hottest cities were located within India, highlighting the unprecedented scale of the heatwave affecting the nation.
What makes this event particularly alarming is that it was not confined to South Asia. At nearly the same time, Europe experienced its own severe heat-related emergencies. France reported deaths linked to extreme temperatures, while London recorded a tropical night, a phenomenon in which temperatures remain above 20°C even after sunset. Wildfires broke out in parts of Scotland, and the United Kingdom shattered a century-old temperature record only to surpass it again the following day. These simultaneous heat events across multiple continents underscored the growing influence of climate change on global weather patterns.
The immediate cause of the intense heat was the presence of persistent high-pressure weather systems that settled over South Asia and remained largely stationary. These systems suppressed cloud formation, prevented rainfall, and trapped hot air close to the surface. With little opportunity for cooling, temperatures continued to rise day after day. However, scientists argue that these weather patterns alone cannot explain the severity of the event. Long-term global warming has intensified such systems, making heatwaves hotter, longer-lasting, and more destructive than they would have been in the past.
According to Gavin Schmidt, humanity has already warmed the planet by approximately 1.5°C since the beginning of the industrial era. While this figure may appear modest, it represents an enormous shift in Earth's climate. Schmidt points out that the world has effectively travelled halfway toward the climatic conditions of the Pliocene epoch, which existed roughly three million years ago when global temperatures were around 3°C warmer than pre-industrial levels. What is most striking is the speed of this transformation. A change that naturally unfolded over millions of years has occurred in just about 150 years due to human activity and greenhouse gas emissions.
The danger of extreme heat is not determined solely by temperature. Humidity plays a critical role in how the human body responds to hot conditions. Under normal circumstances, sweating cools the body because evaporation removes heat from the skin. However, when humidity levels are high, the air already contains significant moisture, making evaporation much less effective. As a result, the body's natural cooling mechanism struggles to function, causing internal temperatures to rise. This can lead to heat exhaustion, heatstroke, organ failure, and, in severe cases, death if medical intervention is not provided quickly.
Scientific research has shown that combinations of heat and humidity can become deadly even at temperatures lower than many people assume. Older adults exposed to 35°C temperatures with 90 percent humidity may face risks comparable to those encountered in 45°C dry heat. Even healthy young adults can be vulnerable when temperatures approach 45°C alongside moderate humidity. Official reports linked at least 37 deaths in India and 10 deaths in Pakistan to the heatwave, although experts believe the true toll is likely much higher because many heat-related fatalities are recorded under other medical causes.
The heatwave also placed enormous strain on infrastructure and essential services. India’s electricity demand surged to a record 270.8 gigawatts on May 21 as millions of people turned to air conditioners, coolers, and fans to cope with the temperatures. The resulting pressure on the power grid contributed to outages in several regions. Water shortages intensified in multiple cities as demand rose sharply while available supplies came under increasing stress. In agricultural regions, livestock suffered severe impacts, with reports of cattle deaths emerging from parts of Rajasthan. Urban infrastructure also struggled, with road surface temperatures in Delhi reportedly reaching around 65°C, raising concerns about damage to roads, transportation systems, and public facilities.
Much of the infrastructure currently in use was designed for the climatic conditions of previous decades rather than the extreme temperatures now being experienced. As a result, systems that once functioned reliably are increasingly vulnerable during prolonged periods of heat. This reality has prompted experts to call for significant investments in climate adaptation, including more resilient power grids, improved water management systems, heat-resistant construction materials, and enhanced public health preparedness.
Perhaps the most concerning aspect of the crisis is that there may be no return to what was once considered normal. Schmidt argues that the idea of returning to a stable climatic baseline is misleading because global temperatures are continuing to rise. Stabilising the climate would require achieving net-zero emissions, meaning greenhouse gas emissions would need to be reduced to a level where any remaining emissions are balanced by removal from the atmosphere. Accomplishing this would require major transformations in energy production, transportation, manufacturing, and land use across the world.
Until such reductions occur, scientists expect temperatures to continue increasing and extreme weather events to become more severe. Climate models suggest that at the current warming level of around 1.4°C, heatwaves of this magnitude strike South Asia roughly once every five years. If global temperatures rise toward approximately 2.6°C by the end of the century, similar events could occur every two to three years while also becoming significantly hotter and more destructive.
The arrival of the monsoon season may provide temporary relief from the immediate heat across much of India. Increased cloud cover and rainfall generally reduce temperatures and alleviate some of the stress placed on people and infrastructure. However, climate scientists caution that such relief should not be mistaken for a solution. The underlying drivers of global warming remain active, and greenhouse gas concentrations in the atmosphere continue to rise.
The summer of 2026 therefore represents more than an exceptionally hot season. It serves as a stark reminder that climate change is no longer a distant threat confined to future generations. Its effects are being felt today through record-breaking temperatures, mounting pressure on infrastructure, rising health risks, and increasingly frequent extreme weather events affecting millions of people across multiple continents. The challenge now is not merely adapting to one heatwave but preparing for a future in which such events become increasingly common unless meaningful action is taken to reduce emissions and slow the pace of global warming.
