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WMO Forecasts a Very Strong El Niño Through February 2027
The WMO forecasts El Niño will strengthen toward a December peak, with a near 100% chance of lasting through February 2027. The outlook warns of greater risks of extreme heat, drought and flooding as El Niño shifts rainfall and temperature patterns.
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Key takeaways
- The WMO forecasts El Niño will strengthen toward a December peak, with a near 100% chance of lasting through February 2027.
- The outlook warns of greater risks of extreme heat, drought and flooding as El Niño shifts rainfall and temperature patterns.
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openai.comCreate a landscape editorial hero image for this Studio Global article: What did the WMO’s October 8, 2026 Global Seasonal Climate Update, based on forecasts from 13 meteorological centres, report about El Niño’s. Article summary: The WMO’s 8 October outlook said the 2026 El Niño was strengthening, was expected to peak around December, and had a near-100% forecast likelihood of persisting through February 2027. It could rank among the strongest ev. Topic tags: general. Style: premium digital editorial illustration, source-backed research mood, clean composition, high detail, modern web publication hero. Use reference image context only for broad subject, composition, and topical grounding; do not copy the exact image. Avoid: logos, brand marks, copyrighted characters, real person likenesses, fake screenshots, UI text, readable text, watermarks, charts with fake numbers, clickbait thumbna
The World Meteorological Organization’s 8 October 2026 outlook says El Niño is strengthening and could become one of the strongest events since at least 1950. It is forecast to peak around December and has a near-100% likelihood of persisting through February 2027. Those are model-based forecasts, not guarantees of how the event will develop or affect individual places. 1
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What the October outlook forecasts
For October–December, the WMO’s multi-model forecast puts the seasonal average Niño 3.4 sea-surface temperature anomaly at approximately +3.7°C. The WMO also forecasts record-level sea-surface temperatures in the central and eastern tropical Pacific during that period. The anomaly figure is a forecast for a specific Pacific region and season; it should not be confused with a measurement of global temperature. 2
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The outlook describes further strengthening toward a very strong event, with the warming trend expected to peak toward the end of the year. WMO statements say the event could reach the upper end of the historical record since 1950. That is a possibility in the forecast, not a ranking that can be confirmed before the event has run its course. 1
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Why Pacific warmth matters
El Niño is marked by unusually warm sea-surface temperatures in the central and eastern equatorial Pacific. WMO reporting says unusually warm water below the surface is feeding the warming at the surface, helping sustain the developing event. 17
El Niño influences weather patterns, but it is not the only factor behind global heat. WMO has described the record temperatures of recent years as the result of human-caused greenhouse-gas warming combined with the shift from La Niña to El Niño. The climate pattern can raise temperatures and alter rainfall on top of that longer-term warming; it does not explain the underlying warming trend by itself. 21
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Risks to temperatures, rainfall and communities
The WMO warns that a stronger El Niño can shift rainfall and temperature patterns and increase the risks of extreme heat, drought and flooding. Which places become wetter or drier varies by region, so a global outlook should not be read as a precise local prediction. 3
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Those hazards can put pressure on communities, economies and ecosystems. The WMO’s update identifies those broad risks, but it does not establish particular crop losses, water shortages, health outcomes or death tolls. Those impacts depend on local conditions and should not be presented as settled results of the seasonal forecast. 3
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The risks come amid already high temperatures. Copernicus reported that August 2026 was the warmest August in its record and tied with July 2023 as the warmest month overall. That observation provides climate context; it is not evidence that the October outlook’s predicted impacts have already occurred. 42
How this compares with earlier El Niño events
El Niño and La Niña typically recur every two to seven years, and El Niño events commonly reach peak intensity between November and February. The forecast December peak therefore falls within the usual seasonal window. 26
The 2023–24 El Niño offers a recent comparison, not a template for every event. WMO reporting says it was among the five strongest on record and contributed to the global temperature records seen in 2023 and 2024, alongside the continuing rise in greenhouse-gas emissions. El Niño’s effects can also continue to influence temperatures after the Pacific event peaks. 19
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What the outlook can—and cannot—tell us
The October update signals a strong likelihood of continued El Niño conditions into early 2027 and highlights increased risks that decision-makers should prepare for. It does not make specific local outcomes inevitable, nor does it verify every projected loss or impact attributed to the event. Forecasts help identify risks; local monitoring and updated outlooks are needed to understand how those risks evolve.
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The WMO forecasts El Niño will strengthen toward a December peak, with a near 100% chance of lasting through February 2027.
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The WMO forecasts El Niño will strengthen toward a December peak, with a near 100% chance of lasting through February 2027. The outlook warns of greater risks of extreme heat, drought and flooding as El Niño shifts rainfall and temperature patterns.