The Australian Bureau of Meteorology has issued a 'La Niña watch' due to signs of possible changes in the tropical Pacific Ocean.

There is a 50% chance that the La Niña weather pattern could develop later in the current year.

Previous La Niña events were associated with significant flooding in eastern parts of Australia over the past two years.

Forecasts indicate higher than median temperatures for all Australian States and Territories from June to August.

International weather agencies, including those from the US and Japan, also suggest a potential return of La Niña.

The Bureau clarifies that a 'La Niña watch' does not confirm the current occurrence of the event.

Predictions for Australia include a normal rainfall for winter, but the possibility of increased rainfall in spring if La Niña develops.

A more detailed winter outlook is expected to be released by the Bureau at the end of May.