El Niño 2026: Tracking a Potential Super El Niño in Real Time

Where it stands. El Niño is official and strong. NOAA issued the Advisory in June 2026 and the event has strengthened since; this week's actual Niño 3.4 reading is on the live dashboard and the anomaly map, which update daily — it is deliberately not typed into this page, because a number written into an article is wrong within the week.

What changed most recently. On 3 September 2026 the WMO put the odds of El Niño persisting through February 2027 at close to 100% and forecast it to reach "very strong" intensity before peaking near the end of the year — the most unequivocal ENSO forecast it says it has ever issued.

What is still forecast, not known. The peak's exact height and timing, and whether this event joins 1982-83, 1997-98 and 2015-16 in the super tier. Monthly official odds sit under How strong could it get?; the month-by-month analyses are on the forecast page.

Jump to: the 2026 timeline · is this a super El Niño? · how strong it could get · what it means for the northern winter · how we track it

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The Pacific spent the first half of 2026 executing a textbook regime change. In February, a fading La Niña. In March, a neutral ocean. In mid-April, weekly readings crossed the El Niño threshold — the week centred on 15 April was the first at +0.5°C. And in June, NOAA made it official with an El Niño Advisory. By the last week of June the Niño 3.4 region was running about +1.8°C above normal — a value most El Niños never reach at their peak around the turn of the year, posted here in early northern summer.

That pace is the story. The 2026–27 event is not just present; it is strengthening on the schedule and trajectory of the three most powerful El Niños in the modern record. The official odds have climbed with it — the section below traces them from June to the latest outlook — for an event in the "super El Niño" tier of at least +2.0°C at peak, reached only by 1982-83, 1997-98 and 2015-16.

This page is the standing guide to the event: the timeline so far, the super question, what winter could bring, and how to follow it. The live dashboard and anomaly map carry this week's numbers; monthly analyses land on the forecast page.

The 2026 timeline so far

Week by week, with the number and the primary source for every entry: Event log →

1. February–March 2026

   La Niña exits

   The 2025–26 La Niña, the cold phase that had shaped global weather patterns, weakened below thresholds. The Pacific's cool anomaly collapsed faster than many seasonal models expected.

2. April 2026

   The threshold falls

   Surface readings sat near normal into early April, but the setup underneath was anything but: a large reservoir of unusually warm water had built below the surface of the western and central Pacific. Downwelling Kelvin waves then delivered it to the surface of the central Pacific. The week centred on 15 April was the first at +0.5°C in NOAA's weekly Niño 3.4 file, and a week later the reading was +0.8°C.

3. May 2026

   Holding above the line

   Weekly readings stayed between +0.8°C and +1.0°C all month — the stretch our May update covered as it happened. (That update said the line was crossed in early May; NOAA has since revised the April weeks, and its file now puts the first +0.5°C week in mid-April.)

4. June 2026

   Official

   With the ocean warm and the atmosphere visibly coupling — trade winds slackening, rainfall shifting east, the Southern Oscillation Index turning negative — NOAA issued the El Niño Advisory. The weekly anomaly for mid-June stood near +1.7°C; the June update unpacked the odds that came with it.

5. Autumn 2026 – winter 2026–27

   Still strengthening

   CPC's 8 October discussion says El Niño "will continue to strengthen through the end of the year" and names no peak months; its odds of a record-strength season are highest for October–December (83%, against 70% for November–January). WMO's 3 September update forecast a peak "towards the end of this year". Each new outlook lands on the forecast page.

Is this a Super El Niño?

"Super El Niño" is an informal label with a concrete definition behind it: a peak Oceanic Niño Index of at least +2.0°C — NOAA's "very strong" tier. Three events have qualified since 1950, peaking at +2.1°C (1982-83), +2.4°C (1997-98) and +2.6°C (2015-16). That bar, and the odds discussed below, are stated on the conventional ONI/Niño 3.4 index; RONI, the relative index that nets out the tropical ocean's own background warming, ranks the same events differently — see the methodology.

Where does 2026 stand against that bar? Three observations frame the honest answer.

First, the official odds have hardened. In June, CPC put very-strong at about 63%; by the August advisory it had moved past 90% and CPC stated it as a floor rather than an estimate — the language forecasters use when the remaining uncertainty is about how far past the bar, not whether it is cleared.

Second, the trajectory matches the analogs. The race chart above aligns 2026's monthly values against 1982, 1997 and 2015 at the same calendar stage; all three of those years also showed rapid warming through the middle of the onset year. Being on that pace in June does not guarantee a super peak — but every past super peak looked like this in June. See the month-by-month numbers against the closest analog on our 2026 vs. 1997-98 comparison.

Third, the residual uncertainty has moved rather than vanished. In June the open question was whether the event would reach the super tier at all — roughly one chance in three said no. That question is largely settled; what is still genuinely open is the peak value, and that is the subject of the next section. Model spread narrows from August onward, so each monthly outlook from here is more reliable than the last, and we track every revision on the forecast page.

How strong could it get?

Joining the super club and setting a record are two different questions, and only the second one is still genuinely open.

The August advisory put a number on it, and the index it used matters more than the number: a 69% chance that October–December 2026 reaches +2.5°C or higher on the RONI — CPC's words are "+2.5°C or more for a 3-month RONI value", and the claim attached to them is that such an event "would exceed the strength of previous El Niño events dating back to 1950". On 8 October CPC raised it to 83% for October–December, and added 54% for September–November and 70% for November–January — the current figures, with their date, are in the box above.

RONI is the relative index: the same Niño 3.4 region, minus the warming of the tropical oceans as a whole. Using it is the whole point of the comparison, because it is the only way to rank a 2026 event against a 1982 one without the intervening decades of background warming doing the work. And on RONI the ranking is not the one the headlines give:

1982–83

+2.4 Nov–Jan

1997–98

+2.3 Oct–Dec

2015–16

+2.3 Nov–Jan

2026–27

+2.0 Aug–Oct

+2.5°C — beats every El Niño since 1950 that event's Oct–Dec value

83% chance that October–December 2026 reaches +2.5°C or more — CPC, October 8, 2026.

Bars: highest 3-month RONI from Aug–Oct of the onset year to Mar–May of the next, with the season it fell in. 2026–27: latest completed season. Source: NOAA CPC Relative Oceanic Niño Index (RONI), 1950–present.

Read those bars against the ONI chart further up and the reason CPC bothers with RONI is obvious. On the conventional index 2015-16 is the strongest event on record (+2.59°C); on the relative index it is not even second, and 1982-83 leads. So +2.5°C on RONI in a single autumn season would beat every three-month value of any season since 1950 — which is exactly the "historic" CPC means, and a stronger claim than "warmest autumn".

What the ocean and atmosphere are showing right now

The diagnosis behind the Advisory rests on more than one number, and each piece is worth knowing because each can wobble independently.

What a strong-to-very-strong event means for the Northern Hemisphere winter 2026–27

The impacts are probabilistic — loaded dice, never a script. But strong events shift the odds hard enough that planning around them pays. The regional tilts — full library at our impact guides — are each covered in a dedicated write-up below:

Risk and insurance desks are re-weighting exposure across those same regions right now — the reshuffle is mapped in our insurance and risk guide. Markets watch the same map: the harvest calendar puts West African cocoa, Asian rice and Vietnamese coffee in the event's path over the coming months — our effects guides follow each sector.

How we track it

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