Intense gusts hitting speeds of approximately 155km/h (96mph) have resulted in nearly 90,000 homes lacking electricity and compelled officials to cancel over 100 flights, according to local media.
The gales are impacting the whole South Island and southern parts of the northern region, according to the weather forecasting body.
Officials in New Zealand have announced uncommon red wind warnings - the highest alert level - in key areas such as Canterbury and Wellington.
People have been advised to remain inside, avoid travel, and prepare for more utility disruptions.
Widespread Destruction and Crisis Measures
The electricity loss seems to be impacting residences mainly in the South Island, although authorities state that the electricity supply was being restored progressively.
Regional news have reported that in various locations structures have suffered roof damage, whereas power lines and trees have been knocked down by the gales.
In Wellington, a man was fatally injured after being struck by a tree branch at a popular trail walking spot on Tuesday.
Meanwhile in Wellington, a individual was blown onto approaching vehicles on a road by a intensive burst, in a incident that was filmed in a widely shared car camera footage.
Flights entering and leaving the urban area have been cancelled as a result of the weather, and certain highways and community centers are also closed.
Simultaneously Canterbury officials have announced a crisis declaration, to facilitate emergency management operations.
Strike Action Alongside Harsh Weather
These intense gusts on Thursday coincide with numerous of teachers, doctors and other public workers are engaged in what has been termed a "significant labor action", demanding improved salaries and workplace environments.
However the severe conditions has compelled them to change some of their plans, with some outdoor rallies relocated inside or called off.
Comparable winds are affecting the nearby nation, ushering in a heatwave to the remote areas.
Authorities have declared flame prohibitions for fear of wildfires.
