Powerful gusts hitting velocities of up to 155km/h (96mph) have left nearly 90,000 homes lacking electricity and led agencies to call off more than 100 air travel services, according to domestic outlets.
The gales are affecting the whole southern region and southern sections of the northern region, per the weather forecasting body.
Officials in New Zealand have released rare high-level wind alerts - the most severe warning - in core zones encompassing these major districts.
Residents have been advised to avoid going outside, refrain from journeys, and make arrangements for more power and communication outages.
The power cut is primarily influencing homes predominantly in the South Island, while agencies state that energy was being gradually reinstated.
Domestic outlets have stated that in some places structures have suffered roof damage, and utility poles and vegetation have been toppled by the gusts.
Across Wellington, a man was lost his life after being impacted by a tree branch at a frequent walking route on Tuesday.
Also in the capital, a woman was swept into moving cars on a road by a strong gust of wind, in a incident that was filmed in a viral dashcam video.
Aircraft services in and out of the urban area have been halted as a result of the weather, whereas various routes and public facilities are also closed.
Simultaneously authorities in Canterbury have announced a state of emergency, to support recovery activities.
The wild winds on Thursday come as many of teachers, doctors and other public workers are participating in what has been described as a "significant labor action", requesting improved salaries and workplace environments.
But the intense climate has pressured them to alter certain arrangements, with various open-air gatherings shifted to interior venues or cancelled.
Like conditions are also sweeping Australia, causing a period of extreme heat to the country's outback.
Officials have announced flame prohibitions for concern about wildfires.
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