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Extreme heat is linked to a record 710,000 deaths worldwide in 2023, a WHO-partnered study finds

Europe bracing for heatwaves in summer 2026, as a WHO-partnered study warns extreme heat killed a record 710,000 people worldwide in 2023 — with a new Super El Niño threatening 857,400 further deaths by March 2027.
Europe bracing for heatwaves in summer 2026, as a WHO-partnered study warns extreme heat killed a record 710,000 people worldwide in 2023 — with a new Super El Niño threatening 857,400 further deaths by March 2027.
Extreme-heat death tolls worldwide, as researchers warn Nigeria alone faces over 56,000 projected casualties from the current El Niño threat.
Extreme-heat death tolls worldwide, as researchers warn Nigeria alone faces over 56,000 projected casualties from the current El Niño threat.

A WHO-partnered study covering 2023 found extreme heat killed more people in a single year than ever previously recorded, with the toll driven sharply higher by a Super El Niño that pushed sea surface temperatures to historic levels. Researchers analysed data across roughly 3,700 regions worldwide to produce the estimate. The findings land as a separate Climate Impact Lab tracker now warns a new Super El Niño could add another 857,400 heat-related deaths between June 2026 and March 2027.

Nigeria faces the heaviest projected toll from the current El Niño, with over 56,000 expected casualties in the coming months.

MoreThe IndependentExtreme heat linked to record 710,000 deaths in a single yearThe TelegraphHigh temperatures linked to more than 700,000 deaths in 2023, study estimatesUN NewsRecord heat-related deaths in 2023, WHO-partnered report finds - UN NewsMirage NewsWHO-Partnered Report Finds Record Heat Deaths in 2023Around PragueHeat Deaths Hit a Record: Why Experts Want a Global Health Emergency - Around Prague
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