US forecasters have indicated that the El Niño weather pattern has intensified significantly over the past month and is highly likely to be among the most substantial on record when it reaches its peak between October and December.
El Niño is characterized by the warming of surface temperatures in the central and eastern equatorial Pacific Ocean, which consequently alters global wind, pressure, and rainfall patterns. The US Climate Prediction Center (CPC) stated in its latest assessment that there is an 81 percent probability of a "very strong" El Niño event occurring between October and December. Such an event would place it among the largest recorded in history, dating back to 1950. A "very strong" designation is defined as exceeding an index value by 2.0 degrees Celsius (3.6 degrees Fahrenheit) or more.
Furthermore, the CPC estimates a 97 percent likelihood that this El Niño event will persist into early spring 2027. Historically, El Niño events have resulted in widespread global consequences, including arid conditions and drought in Australia, increased precipitation during winter in East Africa and the southern United States, and an overall rise in global temperatures.
The CPC further elaborated, stating, "Even the strongest El Niño events do not lead to the typical impact everywhere, but stronger events can more significantly tilt the odds in favor of expected outcomes." Currently, sea surface temperatures in the Niño 3.4 region, a specific area of the equatorial Pacific, are 1.2°C (2.2°F) above average. This warming, combined with subsurface ocean temperatures and altered atmospheric conditions, indicates a strengthening El Niño.
While El Niño typically reaches its peak between November and February, the associated temperature increases often manifest later. In conjunction with human-induced climate change, previous El Niño phenomena have contributed to record-breaking global temperatures, with 2023 identified as the second-hottest year and 2024 anticipated to be the warmest on record.
