The second tropical cyclone of the season is expected to form on Friday.
Fiji's MetService has issued a warning saying it's anticipating the cyclone to develop and affect the island nation after Christmas.
"A broad low pressure area is located to the far north of Fiji," the national forecaster said in a statement.
"The low-pressure system has a high chance of developing into a tropical cyclone."
New Zealand forecaster NIWA says it's keeping an eye on developments.
The most possible track of the cyclone will be determined in the next two days, Fiji's MetService says.
"As the system moves closer to Fiji, we should expect damaging to destructive force winds and heavy rain which may lead to flooding."
Between nine and 12 cyclones will move across the southwest Pacific between November and April. New Zealand is typically affected by one ex-tropical cyclone per year.
"This season, cyclone activity is expected to be near average," said NZ Tropical Cyclone Warning Centre manager Chris Noble.
"All communities throughout the South Pacific, including New Zealand, are encouraged to prepare for the coming cyclone season and remain vigilant for developing cyclones or other severe weather.
"It does not take a direct hit or a severe cyclone to cause significant damage or life-threatening weather," Noble said in October.