By 9am today, 14 arrivals and nine departures had been diverted or cancelled due to the blustery conditions, a Wellington Airport spokesperson said, and the number was expected to increase throughout the morning.
Passengers have been advised to check their flight status with their airlines.
At least 20 Air New Zealand flights in and out of the capital had been cancelled, customer and sales manager Scott Carr said.
Four flights were diverted including three forced to return to Auckland and Christchurch, and a flight from Nelson which was diverted to Palmerston North.
"Our teams are monitoring the conditions closely and working hard to get people where they need to be today," Carr said.
"Customers booked to travel are advised to keep an eye on our website for up-to-date travel information."
The MetService has issued a strong wind warnings for Wellington until 4pm on Sunday, forecasting gale north westerlies gusting 120km/h in exposed places.
Orange weather warnings are in place for the Marlborough Sounds, Wellington, Wairarapa extending south of Greytown and parts of Canterbury.
The unsettled conditions are set to put a dampener on New Year celebrations across some parts of the country.
Tauranga City Council said yesterday it had made the decision to cancel its New Year's Eve community celebrations.
It said a heavy band of rain with possible thunderstorms and lightning was forecast to sweep through between 6pm and 9.30pm when events were due to take place at five locations.
However, one group of Coromandel campers appear to be toughing it out for New Year's Eve despite heavy downpours.
Campers in Cooks Beach have shared video footage showing water pooling around tents and caravan awnings on Friday night.
Flaxmill Campground relief manager Chris Goldsbury said her campground was on higher ground, but it was still very wet underfoot this morning.
"We had a very heavy downpour probably about 7.30pm? And noticed we had 40mm measured in the rain gauge this morning ... but no, everybody was happy, we didn't have any problems."
Areas of the South Island are also in for a stormy start to 2024 with rain, hail and thunderstorms possible across areas of Canterbury, Otago and Southland.
The unsettled summer weather across the country has been largely influenced by the El Nino weather pattern, which has caused swings in temperature variations sparking thunderstorms and heavy downpours.
