Severe gusts reaching speeds of up to 155km/h (96mph) have caused around 90,000 households lacking electricity and compelled agencies to call off in excess of 100 air travel services, as reported by local media.
The gales are affecting the complete South Island and lower areas of the North Island, as stated by the national weather agency.
Officials in New Zealand have announced infrequent severe gust advisories - the most severe warning - in core zones such as Wellington and Canterbury.
Locals have been encouraged to stay indoors, refrain from journeys, and make arrangements for further power and communication outages.
This outage appears to be affecting homes predominantly in the South Island, while agencies say that energy was being slowly brought back.
Domestic outlets have reported that in some places structures have suffered roof damage, and power lines and trees have been brought down by the gales.
In Wellington, a individual was killed after being hit by a tree branch at a frequent walking route on Tuesday.
Additionally in the city, a individual was swept into moving cars on a thoroughfare by a powerful blast, in a event that was recorded in a popular vehicle recording.
Aircraft services to and from the urban area have been cancelled because of the gusts, while some roads and libraries are also closed.
Simultaneously local leaders have issued a crisis declaration, to assist recovery activities.
The powerful gales on Thursday occur while many of teachers, doctors and other public workers are participating in what has been called a "significant labor action", calling for better pay and working conditions.
Yet the extreme weather has compelled them to modify various scheduled activities, with various open-air gatherings shifted to interior venues or abandoned.
Similar gusts are also sweeping the neighboring country, causing a high-temperature event to the nation's interior regions.
Authorities have announced fire bans for fear of wildfires.