Severe gales reaching velocities of as high as 155km/h (96mph) have resulted in nearly 90,000 properties experiencing outages and forced authorities to call off over 100 air travel services, according to local media.
These gusts are impacting the entire South Island and lower areas of the northern region, per the national weather agency.
Officials in New Zealand have issued rare severe gust advisories - the highest alert level - in central regions including Canterbury and Wellington.
Residents have been encouraged to remain inside, refrain from journeys, and make arrangements for more electricity and network failures.
The electricity loss appears to be affecting residences mainly in the southern region, though agencies state that the electricity supply was being restored progressively.
Domestic outlets have reported that in various locations roofs have been ripped off houses, while trees and electricity poles have been toppled by the gales.
Across Wellington, a individual was fatally injured after being hit by a falling limb at a well-known hiking path on earlier this week.
Also in the capital, a woman was pushed toward moving cars on a street by a strong gust of wind, in a event that was recorded in a viral dashcam video.
Air travel to and from the metropolis have been halted due to the weather, and various routes and public facilities are shut down.
Meanwhile local leaders have declared a state of emergency, to support recovery activities.
These intense gusts on Thursday occur while many of school staff, physicians and civil servants take part in what has been called a "major walkout", calling for improved salaries and workplace environments.
Yet the extreme weather has pressured them to alter some of their plans, with various open-air gatherings moved indoors or cancelled.
Comparable winds are impacting the nearby nation, causing a period of extreme heat to the nation's interior regions.
Officials have announced burning restrictions for concern about bushfires.
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