Powerful winds reaching velocities of as high as 155km/h (96mph) have caused approximately 90,000 properties without power and led agencies to halt over 100 flights, based on local media.
The gales are impacting the whole southern region and lower areas of the North Island, according to the national weather agency.
The nation's agencies have announced uncommon severe gust advisories - the most severe warning - in key areas such as Wellington and Canterbury.
People have been urged to stay indoors, refrain from journeys, and make arrangements for more electricity and network failures.
Extensive Destruction and Crisis Measures
This outage seems to be impacting homes predominantly in the South Island, although agencies state that the electricity supply was being slowly brought back.
Domestic outlets have reported that in certain areas homes have lost their roofs, while power lines and trees have been toppled by the gusts.
In Wellington, a individual was fatally injured after being hit by a falling limb at a popular trail walking spot on Tuesday.
Also in the capital, a woman was swept into oncoming traffic on a road by a powerful blast, in a incident that was filmed in a popular vehicle recording.
Flights entering and leaving the metropolis have been suspended due to the gusts, whereas certain highways and community centers are not operating.
Meanwhile authorities in Canterbury have declared a state of emergency, to assist emergency management operations.
Labor Protests Amid Severe Conditions
The powerful gales on Thursday occur while tens of thousands of teachers, doctors and other public workers are engaged in what has been called a "major walkout", calling for improved salaries and workplace environments.
Yet the severe conditions has forced them to alter certain arrangements, with several external protests relocated inside or cancelled.
Similar gusts are impacting Australia, bringing a period of extreme heat to the remote areas.
Officials have issued burning restrictions for fear of bushfires.
