A Climate Impact Lab report warns that the ongoing Super El Niño may cause more than 451,000 additional heat-related deaths worldwide by early 2027, with India facing about 15,800 excess fatalities.
The world is staring at a silent but staggering human toll. A new analysis by the Climate Impact Lab, based at the University of Chicago’s Energy Policy Institute, projects that the current “Super El Niño” will drive more than 451,000 additional heat-related deaths globally between June 2026 and the end of February 2027, compared with a normal year. India ranks fourth among the worst-hit countries, with an estimated 15,800 (±1,600) excess deaths between September 2026 and February 2027.
Scientists project global land temperatures will run 1.2°C above normal in the coming months, largely because of this powerful El Niño that began in June and is expected to persist through the Northern Hemisphere spring. These conditions will produce roughly 44 per cent more extremely hot days than in a typical year and resemble the temperatures climate change is expected to deliver about two decades from now. Researchers have called the event a “postcard from the future.”
The projected 451,000 deaths in the first half of this El Niño alone are about 65 times the 6,800 people believed dead or missing in the recent Nepal flash floods. Nearly 239,000 of those excess deaths are expected in the next six months alone. Impacts are forecast to linger into mid-2027, pushing the total higher still.
Global South Bears the Brunt of Extreme Heat
The heaviest burden will fall overwhelmingly on the Global South. Across Africa’s Sahel region, an additional 66,800 heat-related deaths are projected over the next six months. Nigeria alone accounts for 31,400 of them. Sudan faces 17,500, Niger 10,000 and Chad 8,000.
In Southeast Asia, the Philippines, Vietnam, Thailand and Cambodia together are expected to see 19,400 excess deaths, while Indonesia is projected to record 19,300. Brazil, the worst-affected country in South America, faces about 13,300 additional fatalities. The United States appears among the top 20 most affected nations, with roughly 3,500 projected excess heat deaths.
These figures come on top of the already elevated baseline of heat mortality driven by long-term climate change. The report makes clear that the Super El Niño is amplifying risks that poorer countries, with limited adaptive capacity and high outdoor labour exposure, are least equipped to handle.
India’s Winter Heat Risk and Summer Continuation
India’s projected 15,800 additional heat-related deaths place it just behind Nigeria, Indonesia and Sudan. Nearly half of those deaths are expected between December and February – months normally associated with cooler weather in much of the country. The mortality impact is not expected to end there. Researchers anticipate the toll will keep rising into India’s summer months of 2027.
This timing is critical. It gives authorities a narrow but real window to intervene before the peak risk period. Outdoor workers, the elderly, young children and urban poor living in heat-trapping informal settlements face the highest vulnerability. India’s dense population, rapid urbanisation and large informal workforce compound the challenge.
The findings align with broader warnings that El Niño is already disrupting South Asia’s climate patterns. Earlier this year, El Niño was projected to cut monsoon rainfall sharply across hundreds of Indian districts, heightening drought and heat stress risks for farmers and rural communities.
A Postcard from a Hotter Future
The Climate Impact Lab describes the current temperature anomalies as a preview of the climate that will become normal within about 20 years if greenhouse gas emissions continue on their present trajectory. “El Niño is effectively pushing us into the future – exposing us to temperatures that won’t be the norm for another two decades – before we have time to adapt and protect ourselves,” the report states.
This framing is deliberate. It underscores that the deaths projected for the coming months are not inevitable. They can be reduced substantially through targeted, evidence-based action. The Lab’s Adaptation Inventory identifies measures that have already proven effective in limited settings: heat early-warning systems, cooling centres and hydration stations, protections for outdoor workers, expanded health system capacity, and outreach to vulnerable populations.
Yet many of these interventions have been tested only in a handful of locations. Scaling them rapidly across high-risk regions in Africa, South Asia and Latin America remains the central challenge.
Urgent Action Can Still Save Tens of Thousands
Michael Greenstone, co-founder of the Climate Impact Lab and University of Chicago professor, emphasised the human scale behind the numbers. “The estimate of 451,000 people is such a large number that it can be numbing, but it is made up of parents and children, grandparents and neighbours, people going to work, caring for families, and living their lives,” he said.
The report is designed to give decision-makers precise geographic and temporal information so that emergency resources can be directed where they will save the most lives. Multilateral organisations, national governments and city authorities now have a clear map of where the greatest risks lie between now and February 2027 – and beyond.
In India, the coming winter months offer a critical opportunity. Strengthening heat action plans, ensuring outdoor workers receive rest, shade and water, and expanding cooling infrastructure in high-density urban areas could prevent thousands of deaths. Similar urgency applies across the Sahel and Southeast Asia.
Broader Climate Context in South Asia
The Super El Niño arrives against a backdrop of accelerating climate impacts across the region. Recent Himalayan ice avalanche disasters have already highlighted the need for stronger cross-border early-warning systems and regional cooperation. Heatwaves have repeatedly tested cities such as Ahmedabad, where community-level adaptations led by women in informal settlements have shown that local solutions can reduce mortality when properly supported.
India itself ranks among the countries most affected by extreme weather over the past three decades. Heatwaves that once lasted days now stretch for weeks, pushing temperatures above 45°C in multiple states and driving spikes in hospital admissions and excess deaths. The current El Niño is expected to intensify these trends.
Building Resilience Beyond the Immediate Crisis
While immediate emergency measures can avert tens of thousands of deaths in the next six to nine months, the report also stresses the need for longer-term investment. Improved temperature forecasting, wider access to cooling technologies, anticipatory financing and systematic evaluation of what works in different climates and health systems will be essential as the planet continues to warm.
The Climate Impact Lab plans to update its projections as El Niño evolves, providing decision-makers with continually refined guidance. The message is clear: the Super El Niño of 2026–27 is both a humanitarian emergency and a warning. The temperatures it brings will become ordinary within a generation. How many lives are lost between now and then depends on the speed and scale of the response.
