Wellington's CBD suburb Kelburn was experiencing the strongest gust across New Zealand at the moment.
All ferries across the Wellington Harbour have been cancelled while bracing for towering waves and winds of up to 140km/h.
Metlink Wellington alerted at 1.23pm that due to adverse weather conditions all cross-harbour sailings have been cancelled this evening.
Shuttles would be departing from the city's Queens Wharf at 4.30pm, 5.30pm and 6.30pm, Metlink Wellington said.
Meanwhile, planned roadworks on Remutaka Hill Rd between Upper Hutt and Featherston had been canned as winds are expected to roar through the area.
NZTA were warning drivers who planned to travel over the hill to take extra care as winds over 140km/h were forecast from 4pm to midnight tonight.
Blizzard-like conditions are expected on the Southern Alps and snow had already fallen in parts of the South this morning.
Cardrona Alpine Resort near Wanaka reported that 8cm of snow has fallen, and as of 11am it was still falling.
Snow has also settled at The Remarkables skifield near Queenstown.
Metservice has reported parts of Westland could see up to 250mm of rain accumulate while northwest wind gusts may approach 120-130km/h.
Earlier today, MetService meteorologist Peter Little said the winds in Wellington would pick up from late morning and peak in the late afternoon and early evening.
"We're quite hardy and we're used to strong winds in Wellington, but of course many of us last week enjoyed basking in the wonderful sunshine and the relatively calm conditions."
Wellingtonians that had invested in outdoor furniture or new trampolines over the Christmas period would have to tie them down or bring them in, he said.
"We've been enjoying all that outdoor furniture, but it is going to be very important to make sure it's well secured because it's going to be very, very windy."
"And also people putting out recycling, it's going to have to be very well secured to make sure it's protected from those strong northwesterly gusts."
He also advised motorists to take care on the roads in the windy conditions and watch out for fallen branches, especially those in high-sided vehicles or motorcycles.
While large swells were not expected through the Cook Strait he encouraged anyone with travel plans to check the ferry schedule and Wellington airport for updates.