Powerful gusts attaining speeds of up to 155km/h (96mph) have caused nearly 90,000 properties lacking electricity and led agencies to cancel in excess of 100 air travel services, according to local media.
The winds are impacting the whole southern region and southern parts of the northern region, according to the weather forecasting body.
New Zealand authorities have announced infrequent red wind warnings - the top caution category - in core zones including these major districts.
Locals have been encouraged to remain inside, stay off roads, and make arrangements for more utility disruptions.
Widespread Damage and Crisis Response
The power cut appears to be affecting homes mainly in the southern region, although officials report that the electricity supply was being slowly brought back.
Regional news have indicated that in some places structures have suffered roof damage, while power lines and trees have been knocked down by the winds.
In Wellington, a individual was killed after being struck by a tree branch at a popular trail walking spot on Tuesday.
Meanwhile in Wellington, a woman was swept into oncoming traffic on a street by a strong gust of wind, in a incident that was filmed in a popular vehicle recording.
Aircraft services entering and leaving the city have been cancelled as a result of the gusts, and various routes and public facilities are also closed.
Simultaneously authorities in Canterbury have announced a crisis declaration, to support disaster response efforts.
Work Stoppages Alongside Extreme Weather
The wild winds on Thursday come as many of teachers, doctors and other public workers are participating in what has been described as a "major walkout", demanding improved salaries and workplace environments.
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 also sweeping the neighboring country, ushering in a heatwave to the country's outback.
Officials have declared fire bans for fear of wildfires.
