The World Meteorological Organisation has predicted intensifying El Niño climate conditions will bring exceptionally warmer tropical weather to the Pacific Ocean than is usual over the coming months.

The weather phenomenon has already caused disruption and devastation from droughts and floods throughout the Pacific region and, according to the United Nations agency, El Niño is expected to peak by the end of this year and continue through to the end of February 2027.

Most Pacific island nations have already experienced severe drought conditions from the dramatic changing weather patterns.

The latest update from the organisation's data released this week also demonstrated significant build-up of smoke from multiple Indonesian forest fires that includes its South Papua province, whose plumes have crossed borders into neighbouring countries including Papua New Guinea.

UN Secretary-General António Guterres has been alarmed of the unprecedented conditions, issuing a warning for the western Pacific nations, particularly its Melanesian communities, to pay extra heed to upcoming forecasts from their weather services.

"El Niño is being supersized before our eyes," he said in a UN statement.

"The science leaves no room for doubt: the planet is in uncharted waters, and those waters are heating up."

In some parts of the Pacific, subsurface temperatures rose by more than 8C degrees above normal this year.

It points towards an unusually powerful climate event unfolding.

The likelihood that El Niño will persist for the next six months is close to 100 per cent, the data has revealed.

Never before has the UN weather agency issued such an unequivocal forecast for El Niño or its cooler counterpart, La Niña.

Mr Guterres was advised that the Pacific sea surface temperatures is rising, while stressing that smaller communities are in danger of extreme weather.

"The race now is between rising risks and our commitment to take climate action and protect people," he said.

"We must win that race."