Australia's Bureau of Meteorology (BoM) has forecast that the El Niño currently happening across the Pacific Ocean could become the strongest ever recorded. The bureau's own climate model predicts that ocean temperatures in a key part of the Pacific could reach about 3.3°C above normal. If that happens, it would beat the old record of 2.6°C above normal, set in January 1983, by a wide margin The Guardian.

El Niño is a natural climate pattern that happens every few years. During an El Niño, the surface waters of the Pacific Ocean along the equator get warmer than usual. Think of it like the ocean running a fever — that extra heat changes weather patterns all over the world. When the fever is higher, the effects are bigger.

As of July 2026, El Niño is firmly in place. The BoM officially declared it active on 16 June 2026 BoM Instagram. For the week ending 12 July 2026, the bureau reported ocean temperatures in its key monitoring area at 1.47°C above normal. That is well above the 0.80°C threshold the bureau uses to say El Niño is happening BoM ENSO Update. The U.S. Climate Prediction Center had earlier assessed a 61% chance of an El Niño developing during the May-to-July window Reuters.

The key area scientists watch is called the Niño 3.4 region — a stretch of the central Pacific Ocean along the equator. It is the most widely used yardstick for measuring how strong an El Niño is.

Different climate models give a range of forecasts, but all of them point to a strong event. Model forecasts suggest this El Niño could peak between 2.2°C and above 3°C above normal in the Niño 3.4 region, according to the BoM. The bureau's own model sits at the high end, predicting about 3.3°C. BoM forecasts indicate El Niño conditions will last until at least the Australian summer of 2026–2027, which fits the typical pattern: El Niño events usually peak in summer and then weaken The Guardian; BoM.

Dr Zeke Hausfather, a climate scientist at Berkeley Earth, looked at 14 different seasonal model forecasts. He concluded that this El Niño is very likely to be the strongest since reliable records began, possibly by a wide margin. Experts say that a strong El Niño combined with ongoing global warming could make 2027 the hottest year on record The Guardian.

Dr Zhi-Weng Chua, a senior climatologist at the BoM, and Prof Sarah Perkins-Kirkpatrick, a climate scientist and expert in heat extremes at the Australian National University, are among the specialists whose assessments inform the current outlook The Guardian.

Since September 2025, the BoM has changed how it measures El Niño. It now uses something called a Relative Niño index. This method tries to separate the El Niño warming from the broader warming of the tropics caused by global climate change. In other words, it asks: how much of the temperature rise is from El Niño specifically, and how much is just the overall warming trend? The bureau uses the years 1991–2020 as its baseline for what counts as "normal" BoM.

One institutional detail is worth noting. The specific BoM Climate Driver Update article containing the record El Niño forecast was not found in a search of the bureau's website, and the archive of those updates does not visibly go as far as July 2026 in search results. The BoM also announced in July 2026 that the Climate Driver Update will be renamed to "Southern hemisphere monitoring." Separately, the bureau publishes a Tropical Climate Update product, with an archive entry for a 26 July climate driver update for northern Australia BoM Archive; BoM Announcements; BoM Tropical Climate Update.

The broader context here is about converging climate signals. The 3.3°C forecast from the BoM's own model, if it comes true, would not just beat the 1983 record. It would do so at a time when global temperatures are already elevated. The 1991–2020 baseline the bureau uses is itself warmer than earlier decades, so the temperature rises being measured are on top of an already higher starting point. The shift to the Relative Niño index makes the high readings even more striking: even when you filter out the general warming of the tropics, the central Pacific signal remains extreme.

What bears watching in the coming months is whether the different models start to agree more closely as the event nears its expected peak. The gap of about 0.8°C between the lower-end forecasts and the BoM's own projection is not small, and seasonal models are known to be less reliable the further out they look. But the fact that 14 independent forecasts, as reviewed by Hausfather, all point in the same direction gives weight to the conclusion even if the exact size of the event is still uncertain.

For Australia, the effects are direct. El Niño typically brings warmer and drier conditions across eastern and northern Australia, with higher bushfire risk during the summer peak. For the broader Pacific region, a record-strength event would test fisheries, farming, and water systems that are already under pressure from sustained global warming. The 2027 timeline for a potential record-hot year gives governments and agencies a narrow planning window, but one shaped by enormous uncertainty about how a disturbance this large interacts with a climate system that has already been altered.