Powerful gales hitting speeds of up to 155km/h (96mph) have caused approximately 90,000 households experiencing outages and led agencies to cancel over 100 aircraft departures, according to domestic outlets.
The winds are influencing the whole South Island and southern sections of the North Island, per the weather forecasting body.
The nation's agencies have released rare red wind warnings - the highest alert level - in central regions including these major districts.
People have been urged to stay indoors, refrain from journeys, and prepare for more utility disruptions.
The power cut appears to be affecting homes mainly in the South Island, though agencies report that power was being slowly brought back.
Domestic outlets have indicated that in some places structures have suffered roof damage, whereas utility poles and vegetation have been brought down by the gusts.
Across Wellington, a man was fatally injured after being hit by a falling limb at a popular trail walking spot on Tuesday.
Also in the capital, a woman was pushed toward approaching vehicles on a thoroughfare by a strong gust of wind, in a moment that was recorded in a viral dashcam video.
Flights to and from the city have been cancelled as a result of the winds, whereas some roads and libraries are not operating.
Simultaneously local leaders have declared a state of emergency, to support disaster response efforts.
These intense gusts on today coincide with numerous of educators, medical professionals and government employees are engaged in what has been described as a "mega strike", calling for higher wages and enhanced employment terms.
Yet the severe conditions has forced them to modify certain arrangements, with some outdoor rallies moved indoors or cancelled.
Similar gusts are also sweeping the neighboring country, bringing a high-temperature event to the country's outback.
Agencies have issued burning restrictions for concern about wildfires.
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