Severe gusts hitting velocities of as high as 155km/h (96mph) have caused approximately 90,000 properties without power and compelled officials to cancel more than 100 flights, according to local media.
The gales are affecting the whole southern region and southern sections of the northern region, according to the weather forecasting body.
Officials in New Zealand have released uncommon red wind warnings - the top caution category - in core zones including Canterbury and Wellington.
Locals have been advised to stay indoors, avoid travel, and prepare for further electricity and network failures.
Broad Destruction and Emergency Response
The power cut is primarily influencing residences predominantly in the South Island, although agencies state that power was being slowly brought back.
Domestic outlets have reported that in various locations structures have suffered roof damage, and trees and electricity poles have been knocked down by the gusts.
Across Wellington, a man was killed after being hit by a tree branch at a popular trail walking spot on Tuesday.
Meanwhile in Wellington, a female was pushed toward oncoming traffic on a thoroughfare by a strong gust of wind, in a incident that was recorded in a widely shared car camera footage.
Flights to and from the urban area have been cancelled due to the winds, while certain highways and community centers are shut down.
Meanwhile authorities in Canterbury have issued a crisis declaration, to assist emergency management operations.
Strike Action During Extreme Conditions
These intense gusts on Thursday occur while tens of thousands of educators, medical professionals and government employees are participating in what has been described as a "mega strike", demanding better pay and working conditions.
But the intense climate has forced them to change some of their plans, with various open-air gatherings moved indoors or abandoned.
Similar gusts are affecting the nearby nation, causing a period of extreme heat to the nation's interior regions.
Officials have issued flame prohibitions for apprehension regarding bushfires.
