A rapidly strengthening El Nino in the Pacific Ocean is setting the stage for months of unusually high temperatures and disruptive weather worldwide, with forecasters now putting the probability of the climate pattern continuing through February 2027 at close to 100 percent.
The developing El Nino is being powered by exceptionally warm Pacific waters, including a large reservoir of heat below the ocean surface. The event has yet to reach its peak, increasing concerns about extreme heat, heavy rainfall, flooding and drought during the remainder of 2026 and early 2027.
The World Meteorological Organization’s El Nino and La Nina outlook indicates that the event is strengthening rapidly and is expected to become “very strong”, with a peak likely around the end of 2026.
The near-100 percent probability of El Nino persisting through February 2027 represents an unusually high level of forecast confidence. UN report on El Nino in 2026, WMO has never previously issued such an unequivocal forecast for either El Nino or its cooler counterpart, La Nina.
Pacific Ocean Heat Provides Fuel for El Nino
One of the biggest concerns is what is happening below the surface of the tropical Pacific.
During July and early August, subsurface temperatures in parts of the Pacific were more than 8°C, or around 14°F, above normal. This enormous store of warm water could continue supplying energy to El Nino over the coming months.
Ocean-surface measurements also show rapid strengthening.
The Nino 3.4 index, a key indicator tracking temperatures in the central tropical Pacific, averaged 1.5°C above normal from May through July 2026. The anomaly reached 2°C in July, while weekly readings between late July and mid-August climbed as high as 2.6°C.
The combination of very warm surface waters and substantial heat below the ocean surface suggests that the current event has considerable energy available before reaching its expected peak.
El Nino typically develops every two to seven years when waters across the central and eastern equatorial Pacific become unusually warm. The resulting changes in atmospheric circulation can alter temperature and rainfall patterns thousands of kilometres away.
This event, however, is developing while global oceans are already exceptionally warm because of the broader rise in global temperatures.
Scientists have not established that human-caused climate change is making El Nino itself stronger or more frequent. But warmer oceans and a warmer atmosphere can increase the heat and moisture available to extreme weather events, potentially amplifying some of El Nino’s impacts.
El Nino Could Drive Widespread Heat Through November
The immediate impact is expected to be unusually high temperatures across much of the planet.
From September through November 2026, forecasters expect above-normal temperatures across nearly the entire Earth’s surface.
The consequences will vary considerably between regions. A very strong El Nino does not automatically mean every country will experience severe weather, but the probability of disruptive climate conditions increases.
El Nino typically shifts global rainfall patterns, increasing the risk of excessive rainfall and flooding in some regions while contributing to drought in others.
The emerging climate picture is further complicated by other ocean patterns. A positive Indian Ocean Dipole is expected to develop, while tropical Atlantic waters are forecast to remain unusually warm.
The interaction between El Nino, the Indian Ocean Dipole and exceptionally warm Atlantic waters could create significantly different outcomes across Asia, Africa, the Americas and other regions.
Agriculture, Energy and Water Systems Face Higher Risks
The economic implications could extend well beyond weather-related disasters.
Agriculture is particularly exposed because changes in rainfall and temperature can affect planting schedules, crop yields, livestock and food supplies. Severe drought can reduce agricultural production, while excessive rainfall and flooding can destroy crops and damage transportation infrastructure.
Energy systems could also face greater pressure. Extreme heat increases electricity demand for cooling, while drought can reduce hydropower generation and constrain water supplies needed by thermal power plants.
Heavy rainfall and storms can meanwhile damage transmission infrastructure, disrupt electricity distribution and affect renewable-energy assets.
Water availability represents another major concern. Prolonged drought can reduce reservoirs and groundwater supplies, while extreme rainfall can overwhelm drainage systems and contaminate drinking-water sources.
Public health systems may also face increased pressure from extreme heat, flooding, water shortages and changing conditions for infectious diseases.
Global Agencies Step Up El Nino Preparedness
The escalating forecast has triggered an exceptional international response.
For the first time, the UN system is supporting a mobilisation of this scale with national weather agencies to strengthen forecasting, preparedness and early-warning capabilities as El Nino intensifies.
The effort is aimed at helping governments and humanitarian organisations prepare vulnerable sectors including agriculture, public health, energy and water supplies.
WMO Secretary-General Celeste Saulo warned that despite the Spanish meaning of El Nino — “little boy” — the phenomenon has the potential to deliver a major economic and humanitarian impact around the world.
Early-warning systems will therefore become increasingly important during the final months of 2026. Better forecasts can give governments, utilities, farmers and humanitarian organisations additional time to prepare for drought, flooding, heatwaves and water shortages.
Why the 2026-2027 El Nino Matters
The most important feature of the current El Nino is that much of its development still lies ahead.
The Niño 3.4 temperature anomaly has already moved from an average 1.5°C above normal during May-July to as high as 2.6°C in weekly measurements, while some subsurface Pacific waters have registered anomalies exceeding 8°C.
At the same time, the probability of El Nino lasting through February 2027 is close to 100 percent.
Those indicators point toward a powerful climate event developing on top of already elevated global ocean and atmospheric temperatures.
Businesses and governments will consequently need to watch more than headline temperature records. El Nino could influence agricultural output, food prices, electricity demand, hydropower production, water availability, supply chains and infrastructure resilience during the coming months.
With El Nino expected to strengthen further before peaking around the end of 2026, preparedness for extreme heat, floods and drought is likely to become a growing priority for governments and businesses worldwide.
BABURAJAN KIZHAKEDATH