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

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 carries this week's numbers; monthly analyses land on the forecast page.

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 +2.2°C (1982-83), +2.4°C (1997-98) and +2.6°C (2015-16).

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

First, the official odds are unusually assertive for early summer: about 63% for very strong, per the June outlook. Forecasters rarely commit to numbers like that in June — the spring predictability barrier, which blurs forecasts made before early summer, had just been cleared with the event already at strong intensity.

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.

Third, 37% is not nothing. Roughly one-in-three odds remain, as of the June outlook, that the event tops out below the very strong tier. Model spread narrows substantially from August onward; each monthly outlook from here is more reliable than the last. We track each 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.

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, each covered in a dedicated guide:

• 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.

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.