Bureau of Meteorology declares El Niño underway in Australia

Australia’s Bureau of Meteorology has declared that El Niño is now underway in the tropical Pacific, strengthening the outlook for hotter, drier conditions across parts of Australia through winter and spring.

The bureau said the declaration was based on a set of Pacific signals that now match El Niño, including weakening east-to-west trade winds and pressure and cloud patterns consistent with the event. Forecasters are pointing to a strong, possibly very strong, El Niño, though the bureau stressed that the size of the ocean pattern does not guarantee a matching impact on Australia.

What the bureau said

El Niño is a natural climate pattern in the tropical Pacific that often shifts Australia toward lower rainfall and higher temperatures, especially during winter and spring. The bureau said past El Niño events have been linked with lower winter and spring rainfall, particularly in eastern Australia, and with higher daytime temperatures in southern Australia.

It also said clearer skies associated with the pattern can increase frost risk. The bureau added that climate change is expected to amplify some of the risks tied to the event, including heat and fires.

Why it matters

The declaration carries direct implications for farmers, water managers and fire authorities, especially in eastern and southern Australia. Lower rainfall could affect crops, pasture growth and water supplies, while warmer and drier conditions can increase bushfire preparedness needs.

The bureau also said coral regions may face added stress if warmer conditions continue, including a higher risk of coral bleaching on the Great Barrier Reef.

Timing and context

The update follows recent reports that the bureau had been watching for a transition toward El Niño. The Guardian reported the declaration on June 16, 2026, and news.com.au also reported the bureau had officially declared El Niño underway in the Pacific that day.

The Guardian also reported that the U.S. National Oceanic and Atmospheric Administration and the Japan Meteorological Agency had already declared El Niño, though they use slightly different methods and thresholds.

Australia has already been experiencing unusually warm June weather in parts of the southeast, including Sydney, adding to attention on the seasonal outlook.

What to watch next

The bureau’s next ENSO outlook will show whether the event strengthens, how long it persists and whether seasonal forecasts for winter and spring change further. Other meteorological agencies may also update their own assessments as the Pacific pattern evolves.

For now, the bureau says the event is underway, but its local effects will still depend on how El Niño interacts with other climate drivers.