The intensification of an ongoing El Niño event has reached a new, concerning milestone, with sea surface temperatures in a critical zone of the Pacific Ocean hitting an all-time high in September. According to the European Union’s Copernicus Climate Change Service, the warming phase of this natural climate cycle is exhibiting exceptional strength, even before reaching its projected peak later this year.
In the Nino3.4 region—a standard area for monitoring El Niño activity—sea surface temperatures soared to 29.70°C last month. This reading exceeds the peaks recorded during previous major El Niño events in 1982/1983, 1997/1998, and 2015/2016. While Copernicus officials noted that it is difficult to definitively categorize this event as the strongest in history due to the complicating influence of underlying human-caused climate change, the data underscores a dangerous upward trend. Because global warming has systematically raised baseline ocean temperatures, modern events often appear more intense than their predecessors, making historical comparisons complex.
Not all meteorological agencies wait for a full retrospective to declare a record. Japan’s weather agency recently stated that El Niño conditions have reached their “strongest intensity on record,” with temperatures in the monitoring region sitting 4°C above normal.
The warming of the Pacific is having a profound ripple effect on the global climate. Copernicus reported that the global average sea surface temperature reached a record 21.05°C in September, surpassing the previous record set for that same month just one year prior. Consequently, the world experienced its second-hottest September on record, with average surface air temperatures reaching 16.27°C—a staggering 1.63°C higher than the pre-industrial average of 1850–1900.
This data is particularly alarming given the international commitment made under the 2015 Paris Agreement to keep long-term global warming “well below” 2°C, and ideally within the 1.5°C threshold. United Nations reports now indicate that the 1.5°C limit is likely to be breached within a matter of years.
“We are in a new run of months above 1.5°C, and with a strong El Niño still intensifying, it is likely to last into 2027,” said Carlo Buontempo, director of the Copernicus Climate Change Service. “Crossing the Paris Agreement’s long-term limit is only a matter of time. How far we overshoot, and for how long, is still up to us.”
The current El Niño, characterized by warmer surface temperatures in the central and eastern equatorial Pacific, triggers global shifts in wind, atmospheric pressure, and rainfall patterns. These shifts significantly exacerbate the risk of extreme weather, ranging from severe droughts to catastrophic flooding. Typically, the cycle occurs every two to seven years and lasts between nine and 12 months.
As the phenomenon continues to gather strength, scientists emphasize that the window to mitigate long-term damage is closing. Experts warn that this specific event will likely propel global temperatures to a new record high by 2027. To limit the duration and severity of the “overshoot” above the 1.5°C target, researchers reiterate that a rapid and aggressive reduction in greenhouse gas emissions from fossil fuels remains the only viable path forward. The current records serve as a stark reminder that the combined pressure of natural climate variability and anthropogenic warming is pushing the Earth’s systems into uncharted territory.
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