El Niño projected to cause 450,000 deaths from heat in six months

A staggering new scientific assessment warns that an unprecedented super El Niño weather event is projected to cause more than 450,000 additional heat-related deaths worldwide over the next six months. Compounding the existing baseline of heat mortality already elevated by the human-caused climate crisis, the soaring temperatures driven by the current ocean oscillation are shattering historical precedents across the globe, striking vulnerable populations from Indonesia to India, and Nigeria to the United States, according to The Guardian.

The phenomenon, characterised by the warming of surface waters in the central and eastern Pacific Ocean, acts as a massive redistribution of energy within the global climate system. Recent data indicates that the temperature anomaly at the heart of the current El Niño has reached 3.05 degrees Celsius above the historical average, decisively breaking the previous record of 3.02 degrees Celsius set during the catastrophic 2015 event, as reported by Streamline Feed. Meteorological forecasts suggest the situation will intensify further, with predictive models indicating the temperature anomaly could peak at an astonishing 4.0 degrees Celsius in November and December. Any anomaly above 2.0 degrees is officially classified as a "very strong" or "super" El Niño, pushing Pacific temperatures around 2.6 degrees Celsius above the 30-year average, according to The Standard.

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The El Niño currently heating up the planet burst through the highest temperature ever recorded for the phenomenon, several months before its expected peak. The heat is so much greater than previous events that scientists have called it mind-blowing and Godzilla-level, as detailed by Gazeta Express. The projections were produced by the Climate Impact Lab at the University of Chicago, combining seasonal temperature forecasts with highly localised estimates of how elevated heat affects mortality across more than 24,000 distinct regions worldwide, using a baseline of heat deaths from the average month between 1996 and 2025.

"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."

Prof Michael Greenstone, co-founder of the Climate Impact Lab and at the University of Chicago, via The Guardian

While the exact mortality estimate stands at 451,000 additional heat-related deaths between September 2026 and February 2027, researchers emphasise that elevated levels of heat deaths are expected to continue until June or July 2027. Furthermore, this staggering figure accounts solely for physiological heat stress and does not include the myriad indirect fatalities that will inevitably result from severe droughts, rampant wildfires, collapsing agricultural yields, and extreme flooding events that are universally associated with powerful El Niño cycles, noted LADbible.

The distribution of this projected mortality is profoundly unequal, exposing deep systemic vulnerabilities across the developing world. The research highlights that the heat danger is most acute in regions that are naturally hot and economically disadvantaged.

Food supplies will also be severely disrupted by the event. The World Food Programme warned in August that El Niño's impacts were likely to push about 50 million people into acute hunger and drive prices up. History offers a grim reminder of these risks: a major El Niño in 1877–1878 led to more than 50 million deaths due to drought and famine, with India, Brazil, and China severely affected.

"The [current El Niño] event is a huge redistribution of energy in the climate system and is dangerous, because it is unfolding on top of a much warmer, human-influenced climate system. So, in many places around the world we will see never-before-experienced heat extremes, with all their consequences on health, food security and water stress."

Prof Friederike Otto, Imperial College London, via The Guardian

Researchers describe the current thermal spike as a postcard from our future, pushing up temperatures to the level the climate crisis is projected to deliver in 20 years’ time.

What to Watch Next

• Submission of the Climate Impact Lab report to a peer-reviewed scientific journal.
• Implementation of emergency measures by governments, including the opening of cooling centres, enhanced heat forecasting, and mandated protections for outdoor workers.
• Global temperature tracking as models project the El Niño anomaly to peak in November and December 2026, with mortality evaluations extending through mid-2027.