Powerful gusts attaining speeds of as high as 155km/h (96mph) have left approximately 90,000 properties lacking electricity and compelled authorities to cancel over 100 flights, according to local media.
The winds are influencing the entire South Island and southern sections of the northern region, according to the weather forecasting body.
The nation's agencies have released rare high-level wind alerts - the top caution category - in central regions including Canterbury and Wellington.
People have been encouraged to remain inside, refrain from journeys, and prepare for further utility disruptions.
Widespread Impact and Crisis Response
The power cut seems to be impacting homes predominantly in the southern region, though authorities report that power was being slowly brought back.
Domestic outlets have indicated that in various locations homes have lost their roofs, whereas power lines and trees have been brought down by the winds.
Within the capital, a individual was fatally injured after being impacted by a wooden fragment at a popular trail walking spot on earlier this week.
Also in the capital, a female was swept into approaching vehicles on a thoroughfare by a strong gust of wind, in a event that was recorded in a widely shared car camera footage.
Aircraft services in and out of the urban area have been halted as a result of the gusts, and some roads and libraries are also closed.
Simultaneously local leaders have announced a crisis declaration, to support recovery activities.
Strike Action During Extreme Conditions
The wild winds on today come as tens of thousands of teachers, doctors and other public workers are engaged in what has been called a "significant labor action", calling for better pay and working conditions.
But the extreme weather has pressured them to modify some of their plans, with various open-air gatherings relocated inside or cancelled.
Similar gusts are affecting the nearby nation, ushering in a heatwave to the country's outback.
Officials have declared burning restrictions for concern about forest fires.
