UN weather body says El Niño set to intensify and last until February 2027 ↧ ↧ UN weather body says El Niño set to intensify and last until Febru... This year's El Niño will intensify before peaking in December and is nearly 100% certain to last until February ​2027, the World Meteorological Organization said in its monthly climate bulletin ‌on Thursday, with sea surface temperatures set to break records.