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 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 April, nothing — a neutral ocean. In May, weekly readings slipped past the El Niño threshold. 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 midwinter peak, posted here in early 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 June outlook put roughly 88% odds on at least a strong event and 63% on a very strong one — 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.

WMO El Niño Update — 3 September 2026. The World Meteorological Organization now puts the likelihood that El Niño persists through February 2027 at close to 100%, and forecasts the event to strengthen "to a very strong intensity before peaking towards the end of this year." WMO notes it has never issued so unequivocal an ENSO forecast. Its own readings for the Niño 3.4 region: +1.5 °C above normal averaged across May–July, +2.0 °C in July, and weekly values from late July to mid-August running roughly +2.2 °C to +2.6 °C. Below the surface, parts of the Pacific were more than 8 °C above average in July and early August — the reservoir that keeps feeding the warmth up top. Source: WMO, 3 September 2026.

The 2026 timeline so far

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.

April 2026 — a neutral, loaded ocean. Surface readings hovered near normal, 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, the classic precursor when it starts sliding east along the thermocline.

May 2026 — the threshold falls. Downwelling Kelvin waves delivered that warm subsurface water to the surface of the central Pacific. Weekly Niño 3.4 anomalies crossed +0.5°C and kept climbing — the moment our May update covered as it happened.

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.

November 2026 – January 2027 — forecast peak. Model consensus favors a maximum between the September–November and November–January seasons: the standard ENSO calendar, carrying an unusually strong event.

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.

One further nuance belongs in any careful account: because the whole ocean has warmed over recent decades, scientists increasingly cross-check headline anomalies against the Relative Oceanic Niño Index, which measures the Pacific relative to the rest of the warming tropics. By either yardstick, 2026 is a major event; the relative index mostly matters for fair comparisons against 1982 or 1997.

There is also a longer backdrop. Galápagos coral records published in Science on 27 August 2026 (Cole et al., doi:10.1126/science.ady2660) show a large recent increase in year-to-year swings of eastern-Pacific ocean temperature compared with the last thousand years — more than climate models' natural variability produces — and attribute it to stronger El Niño events. The study says nothing about how high this event will peak; it is the backdrop the comparisons with 1982, 1997 and 2015 sit on.

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".

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:

Read that table against the ONI one 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".

Two cautions belong beside that number, and they pull in opposite directions.

Autumn is usually not the peak. All three events above kept warming into midwinter — 2015-16 gained another 0.14°C between OND and its November–January high. So an OND figure is a milestone passed on the way up, not the final score, and the seasons that will contain this event's peak have not been computed yet.

But the peak is measured on the ONI, a three-month average, and that is a slower and lower number than the weekly value most coverage quotes. Late August's weekly Niño 3.4 anomaly was +2.6°C; the most recent completed ONI season, May–July, was +1.39°C. Those are not competing measurements of the same thing, and a weekly +2.6 is not a record — the record is +2.59°C as a three-month mean. Anyone reading the two as interchangeable will call this event a record several months before the data can say so, in either direction.

And the two indices must not be mixed. The 69% figure is a RONI threshold; the +2.59°C record quoted everywhere is an ONI value. Comparing one against the other — which is easy to do and which this page did until 3 September — makes an event look like a record months before any index can say so.

The honest summary is narrower than the headlines and more interesting than a hedge: a top-tier event is close to settled, a historic RONI reading is more likely than not, and nothing yet has decided the peak.

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.

The surface warming has the right shape. Anomalies stretch from the South American coast — where the Niño 1+2 region has been running the hottest readings of all, past +3°C in recent weeks — through the central Pacific. That east-loaded pattern resembles the classic "Eastern Pacific" flavor of El Niño, the variety associated with the strongest coastal impacts in Peru and the most reliable global teleconnections. Whether that flavor persists through the peak is one of the open scientific questions of the season.

The subsurface is the fuel gauge. The reservoir of warm water below the surface — the anomaly along the thermocline that Kelvin waves have been delivering eastward since spring — remains substantial. Events falter when that reservoir drains early; forecasters watch the monthly upper-ocean heat content figures as the best single predictor of whether intensification continues on schedule.

The atmosphere has voted, but keeps voting. The Southern Oscillation Index turned negative in April–May, trade winds have slackened across the basin, and rainfall has migrated toward the dateline. Full coupling — the self-reinforcing loop where the atmosphere's response strengthens the ocean anomaly that caused it — is what carries events through autumn. The weekly SOI readings on the dashboard are the pulse to check.

None of these indicators is exotic; all are public, and all feed the same conclusion the official odds encode: a mature onset, unusually strong for the calendar date, with the physical ingredients for further strengthening in place.

What a strong-to-very-strong event means for 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:

• United States: a stormier, wetter southern tier from California to the Gulf and Southeast, a milder northern tier, and a subtropical jet doing the delivering — the full picture is in the US guide.
• Australia: drier east and north with elevated bushfire risk through the 2026–27 season, detailed in the Australia guide.
• Indonesia and Southeast Asia: deepening dry-season deficits, low rivers and fire-and-haze risk, covered for Indonesia and the wider region.
• South America: flood-prone rains on the Peruvian coast and a wetter southern cone — see the Peru and South America guide.
• East Africa: enhanced October–December short rains, with flood and disease-outbreak precedents from 1997, in the East Africa guide.
• Atlantic hurricanes: the one impact already in progress — wind shear suppressing the current season — explained in the hurricane guide.

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

Everything on this site reduces to a handful of public NOAA and NASA feeds, fetched and charted automatically: weekly Niño-region temperatures, the monthly ONI, the SOI, official probabilities and satellite sea-surface-temperature anomaly maps. The data and methodology page documents every source and its update cadence, and the dashboard renders them live — including the intensity gauge and the race chart you can download and share.

For a once-a-week digest instead of a daily habit, the El Niño Briefing summarizes the index moves, forecast changes and one impact story every week.

A note on what we will and won't say as the season unfolds. This tracker reports observed values with their sources, quotes official probabilities with their dates, and frames every future statement as odds. What it will not do is convert a 63% probability into a certainty for the sake of a headline — the 2015-16 California story is the permanent reminder of where that leads. When the odds change, in either direction, this page changes with them and says so.

The months ahead have a known rhythm worth marking in a calendar. Official outlooks arrive monthly around the second Thursday, each one more skillful than the last as the event matures. August–September historically reveal whether a strengthening event consolidates or stalls. October–December is peak-formation season, when the maximum is usually set. And by February–March 2027, attention flips to the decay: how fast the event unwinds, and whether the Pacific swings toward neutral or overshoots into La Niña — as it did, consequentially, after both 1998 and 2016.

Bottom line

The 2026–27 El Niño is real, official, already strong in early July, and forecast — with unusual confidence for this stage — to peak between November 2026 and January 2027 at strong-to-very-strong intensity. Whether it ultimately joins the super-El-Niño club of 1982, 1997 and 2015 will be decided by the ocean over the next few months. Monthly analyses land on the forecast page after each official outlook; the numbers refresh on the dashboard all season long. Event updates are listed below.