WMO Forecasts Record-Breaking El Niño With +3.7°C Pacific Anomaly

The World Meteorological Organization has projected that the ongoing El Niño will reach an unprecedented +3.7°C anomaly in the central and eastern Pacific Ocean by the end of 2026. The October 8 forecast warns that the weather pattern is strengthening rapidly and will likely become the most powerful event recorded since at least 1950.[1][2]

The anticipated +3.7°C deviation in the Niño 3.4 monitoring region significantly exceeds the previous modern record of +2.6°C, which was set during the intense 2015–2016 El Niño. Scientists expect the current event to peak around December and persist with near certainty through February 2027.[1][2]

"El Niño is firmly established and strengthening rapidly," said WMO Secretary-General Celeste Saulo in the agency's Global Seasonal Climate Update. She noted that the ocean is currently the warmest ever measured, providing a massive reservoir of thermal energy ready to be released into the atmosphere.[1][2]

The transition from a strong to a very strong El Niño has been exceptionally fast. The WMO reported that sea-surface temperatures in the Niño 3.4 region increased markedly from an average of +1.6°C above normal in June to +2.5°C above normal in August, before accelerating into the autumn.[1]

The rapid escalation has forced forecasters to continually revise their models upward throughout the summer. The consensus projection of a +3.7°C peak is based on real-time data exchange from 13 national and international meteorological centers coordinated by the WMO.[2]

Uncharted Ocean Temperatures

Recent measurements indicate the Pacific is already breaking historical boundaries. According to data from the US National Oceanic and Atmospheric Administration, absolute temperatures in the Niño 3.4 region crossed 30°C for the first time in the observational record, reaching 30.06°C on October 5.[1]

Climate scientists tracking the daily data have expressed alarm at the trajectory. Zeke Hausfather, a climate scientist at Berkeley Earth, noted that the September monthly anomalies had already set a record at 2.9°C, beating the previous highs recorded in 2015 and during the devastating 1877 event.[1]

"This year's El Niño continues its climb into uncharted waters," Hausfather wrote, observing that recent daily anomalies had briefly touched 3.4°C above normal. Meteorologists warn that this massive accumulation of marine heat will have major, and in some cases unprecedented, effects on global weather patterns.[1]

The sheer volume of marine heat involved is staggering. El Niño does not generate new planetary heat; rather, it redistributes energy that the ocean has already absorbed from decades of greenhouse gas emissions.[1][2]

As equatorial trade winds weaken, this warm water sloshes eastward across the Pacific. The movement transfers massive amounts of moisture and heat into the air, fundamentally altering atmospheric circulation and jet stream patterns worldwide.[1]

Global Weather Disruptions

The shift in ocean temperatures drives predictable but severe changes in regional precipitation. Forecasters expect wetter-than-normal conditions to drench the Greater Horn of Africa, parts of Central and East Asia, the northern Arabian Peninsula, and the southern United States, significantly increasing the risk of flooding.[2]

Conversely, the WMO anticipates severe dry spells across the Indian subcontinent, southern Central America, parts of the Caribbean, and northwestern South America. Meteorologists estimate that intensified drought conditions could threaten agricultural yields and water supplies for millions of people in these vulnerable regions.[2]

The extreme heat component of the forecast is equally severe. Meteorologist Ben Noll estimates that up to 2.6 billion people worldwide could experience unusually high temperatures for the time of year through December, compounding the baseline warming driven by human-induced climate change.[1]

Extreme rainfall events linked to the shifting atmospheric currents could simultaneously threaten around 1.3 billion people globally. Areas at particular risk for heavy precipitation include western and southern Europe, the Middle East, and southern Australia.[1]

Infrastructure in many of these regions is not built to withstand the projected volume of water. Flash flooding and landslides pose an immediate threat to communities in the identified high-risk zones through the winter months.[1]

Compounding Climate Factors

The Pacific anomaly is not acting alone in reshaping the winter forecast. The WMO update also projects a positive Indian Ocean Dipole, which is expected to peak in October with an anomaly of +0.5°C, further influencing rainfall patterns around the Indian Ocean basin.[2]

The combined effect of these oceanic shifts is expected to push global average temperatures even higher. "El Niño doesn't add new heat to the planet. It releases heat the ocean has already been storing beneath the surface — which is why a strong event so often becomes one of the hottest years measured," Saulo explained.[1][2]

Because the atmospheric warming associated with El Niño typically lags behind the ocean temperature peak by several months, climate scientists warn that 2027 could easily surpass recent years as the hottest on record. The WMO notes that the influence on weather patterns will likely continue well into the spring.[1][2]

Humanitarian agencies and national meteorological services are already using the consensus forecast to pre-position resources. The WMO's projection provides a critical window for governments to prepare for the impending climate shocks before they materialize.[2]

While the WMO expects the event to begin dissipating in the spring of 2027, the downstream consequences will linger much longer. The exact severity of the localized impacts now depends on how the record-breaking Pacific heat interacts with regional weather systems over the coming months.[1][2]