Power outages are being reported across Auckland, and a motorist has reported that a portable home on a trailer has overturned on a major highway, as blustery winds batter the city.

The MetService has issued a strong wind warning for Auckland, saying southwesterly winds could approach severe gales in exposed places.

A Vector spokesman said at 1pm crews have been responding to multiple power outages mostly affecting parts of West and North Auckland this morning.

Exact locations and the number of customers affected wasn't available, because Vector has developed a new system to improve communications during outages which means it can't say whether the outages have affected hundreds of customers, or hundreds of thousands.

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The spokesman said the outages were caused by strong winds.

"The network lost several feeders and one zone substation supplying power to multiple areas. A feeder typically supplies several streets with power. A zone substation supplies multiple feeders.

"The outages were caused by strong winds causing lines to clash, or by trees and vegetation blowing on to lines."

All available crews were assigned to jobs.

By midday, the zone substation and four feeders had been restored, with crews continuing to work through the remaining restoration jobs.

Vector's focus was on restoring power as quickly as possible while ensuring the safety of crews and the public, he said.

People affected by outages could stay up to date with restoration work relevant to their specific address through Vector's Outage Centre at vector.co.nz/outages

Lines should also be treated as live at all times, the spokesman said.

"If you see any damaged power equipment or power lines down, please keep a safe distance away and report it to us as soon as possible on 0508 VECTOR."

The blustery conditions proved alarming for some Auckland residents, among them Onehunga woman Jeanette Hutchinson.

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"I live on the third floor of a four-storey apartment building in Onehunga and the wind is very scary," she wrote in an email to the Herald.

"Thankfully, I don't need to venture outdoors today as I doubt that I would make it to the lift. The Manukau Harbour is looking very wild and churned up."

Meanwhile, just before noon, a man told Newstalk ZB a portable home on a trailer had overturned on State Highway 20 at Mangere Bridge.

The man said he reckoned strops must have come off in the wind, causing the tiny house to flop over on the bridge.

An NZTA spokeswoman said the vehicle and trailer had jack-knifed and were now in the southbound bus lane, but the incident wasn't affecting traffic too badly.

The fire service has also been kept busy, with six weather-related calls across the upper North Island, a Fire and Emergency spokesman said at 11.35pm.

The calls were predominantly for trees having fallen down, he said.

Residents in parts of the North Shore, East Auckland and West Auckland said their power had been knocked out this morning.

There were reports of power out in Mairangi Bay, Browns Bay, Rothesay Bay, Windsor Park, Sunnynook, Titirangi, Swanson, and Glen Eden this morning.

The MetService said the southwesterly that fuelled a wild weather week, bringing damaging tornadoes, thousands of lightning strikes and monster 10m-high waves, was sticking around today.

"The whole country is covered with this very strong southwesterly flow, with gales in exposed places through the lower South Island and parts of Hawke's Bay and Wairarapa," MetService meteorologist Ravi Kandula said.

"There's also a gale southerly coming through Wellington later this morning."

The southwesterlies also mean dreary, damp days for those in the firing line. Showers are expected across almost the entire country today. Only the top of the South Island and Bay of Plenty escape the wet.

Kandula said it would gradually ease from mid-afternoon.

"We'll have fine weather for a large part of the country tomorrow morning. There'll only be a few showers in the evening on the [South Island's] West Coast, and winds will be easing across the board."

Eastern areas of both islands, such as Hawke's Bay, Marlborough, Canterbury and Dunedin, were looking the best places to be tomorrow, he said.

Giant waves thrashing the country's western coasts, and which have prompted warnings to anyone considering fishing off rocks in the west and boaties wanting to tackle dangerous river bars or harbours, are also expected to ease late tomorrow.