The Geneva-based World Meteorological Organization (WMO) reported Tuesday that the La Niña weather phenomenon, usually associated with a cooling of global temperatures for several months, could begin to affect the planet as early as September.

The forecasts of this specialized agency of the United Nations point to a 55% probability of entering a period dominated by La Niña. between September and November, a figure that would increase to 60% in the October-December period.

This meteorological phenomenon, caused by lower water temperatures in the central and eastern Pacific, is often accompanied by changes in tropical atmospheric circulation, along with variations in wind and precipitation.

A phenomenon opposite to El Niño 

The warm and cold phases of the Pacific climate cycle influence the tropical atmosphere. Although El Niño has not been detected since 2024, conditions have remained neutral since March.

The WMO warns, however, that despite forecasts of cooling, climate change caused by human activity will keep temperatures above average in much of the world, intensifying extreme weather events.