Intense gusts attaining speeds of as high as 155km/h (96mph) have resulted in approximately 90,000 homes lacking electricity and forced agencies to call off over 100 air travel services, according to regional news sources.
The gales are affecting the entire southern region and southern parts of the northern region, according to the weather forecasting body.
The nation's agencies have released rare red wind warnings - the most severe warning - in key areas including Wellington and Canterbury.
Residents have been advised to remain inside, refrain from journeys, and make arrangements for further electricity and network failures.
Broad Damage and Emergency Response
The power cut appears to be affecting households mostly in the South Island, though authorities say that energy was being slowly brought back.
Local media have stated that in some places structures have suffered roof damage, whereas power lines and trees have been brought down by the gales.
Across Wellington, a man was fatally injured after being impacted by a tree branch at a frequent walking route on Tuesday.
Additionally in the city, a female was swept into approaching vehicles on a thoroughfare by a strong gust of wind, in a moment that was filmed in a popular vehicle recording.
Flights entering and leaving the metropolis have been halted because of the weather, while certain highways and community centers are not operating.
Meanwhile authorities in Canterbury have declared a state of emergency, to assist recovery activities.
Work Stoppages During Harsh Weather
The wild winds on Thursday come as tens of thousands of school staff, physicians and civil servants are engaged in what has been described as a "significant labor action", requesting improved salaries and workplace environments.
But the extreme weather has forced them to modify certain arrangements, with some outdoor rallies relocated inside or abandoned.
Comparable winds are also sweeping Australia, bringing a heatwave to the remote areas.
Officials have declared flame prohibitions for fear of forest fires.
