El Niño conditions continue through February 2027.
WMO forecasts cited by Carbon Brief indicate a nearly 100% probability that the current El Niño event persists through February 2027. Official ENSO monitoring will confirm whether it continues.
Across 6 frontier models answering independently, the panel treats this as close to settled: the median is 90%.
They do not agree: GPT puts it at 94% and Claude at 4%, 90 points apart. A spread that wide usually means the question turns on something none of them can see yet.
Nothing is settled until 15 Mar 2027, when the outcome is checked against sources and every number above gets a permanent score.
What each one said
-
GPTOpenAI
The forecast hinges on unusually strong coupled Pacific warming surviving the boreal winter transition.
- WMO-backed outlooks reportedly put persistence through February near certainty, leaving only a sharp late-season collapse.
- Official confirmation depends on NOAA/WMO ENSO indicators remaining above El Niño thresholds through February 2027.
- ENSO events commonly peak in winter and then decay in spring; rapid cooling or a La Niña transition would most change this view.
94% -
QwenAlibaba
El Niño persistence through Feb 2027 is nearly certain given current ENSO state and WMO forecasts.
- Current El Niño is well-established with SSTs well above threshold; ENSO events rarely collapse mid-winter without a forcing shift.
- WMO and CPC forecasts already show near-100% persistence through early 2027; base rate for El Niño continuing from Sep through Feb is ~90%+.
- Would need a rapid, unprecedented transition to La Niña or neutral by Feb 2027, which has no historical precedent from this phase.
92% -
GrokxAI
ONI stays ≥0.5 °C through the NDJ and DJF 2026-27 seasons.
- WMO/IRI already assign ~100 % chance of persistence from the mature event now in place.
- Mature El Niños that exist by September historically last through the following winter 85-90 % of the time.
- Only an unforecast Kelvin-wave reversal by November would end it; current heat content makes that unlikely.
91% -
GeminiGoogle
ENSO events established by September historically persist through boreal winter peak with exceptionally high predictability.
- Past the spring predictability barrier, dynamical model consensus rarely fails on 5-month duration calls for mature events.
- Base rate for an established September El Niño maintaining Oceanic Niño Index >= 0.5°C through February exceeds 85%.
- Rapid oceanic heat discharge from early westerly wind burst collapse would be the primary trigger for a premature transition.
88% -
DeepSeekDeepSeek
Whether the current warm event survives the boreal spring predictability barrier into early 2027.
- NOAA CPC and Australia's BoM must keep ONI at or above +0.5C for overlapping trimonthly windows through JFM 2027; the call is theirs, not WMO's.
- El Nino events typically decay in the first half of the year after onset, and spring transitions are the hardest to forecast, so a persistence claim this far out is…
- The cited near-100% figure likely reflects model ensembles rather than a settled official forecast; a return to ENSO-neutral by December would be the clearest sign this…
62% -
ClaudeAnthropic
ENSO cycles rarely stay in one state that long; current state and trajectory into 2026-27 winter matter most.
- ENSO events typically last 9-12 months, and El Niño/La Niña alternation is the norm, not multi-year persistence.
- As of late 2025 conditions were widely reported as La Niña or neutral, not El Niño, making the WMO 'near 100%' framing implausible as stated.
- This looks like a garbled or mismatched premise; actual NOAA/WMO forecasts for winter 2026-27 would need to show El Niño for this to resolve true.
4%
6 of 6 models answered · 90 points between the highest and lowest. None was shown the market price.
Question sourced from a news sweep on 16 Sept 2026. Forecast by google/gemini-3.8-flash, anthropic/claude-sonnet-5, openai/gpt-5.6-terra, x-ai/grok-4.6, deepseek/deepseek-v4.1-flash, qwen/qwen3.8-max-0902 via OpenRouter.