The World Meteorological Organization (WMO) recently issued its latest update on El Niño/La Niña phenomena, stating that the La Niña phenomenon may return starting from this September, potentially influencing global weather and climate conditions in the coming months.
However, despite the temporary cooling effect of the La Niña phenomenon, temperatures in many regions around the world may still be above average.
The meteorological organization pointed out that neutral conditions (neither El Niño nor La Niña) have persisted since March 2025. However, La Niña may start to emerge in September and materialize in the following months. The likelihood of the El Niño phenomenon occurring between September and December is very low.
Although the La Niña phenomenon may return to many areas, the bulletin also noted that from September to November, temperatures in many regions of the Northern Hemisphere and large parts of the Southern Hemisphere are expected to be above average.
The La Niña phenomenon refers to the widespread and persistent abnormal cooling of sea water in the central and eastern equatorial Pacific, while the El Niño phenomenon refers to the widespread and persistent abnormal warming of sea water in the equatorial Pacific region.