Wild weather has seen parts of the North Island pummeled with heavy rain, while South Islanders will see travel disruptions from snow, slips and trees blocking roads.
It comes as New Zealanders could experience "possibly the coldest week of the year" with Te Anau locals waking up to a bone-rattling temperature of -7.2 degrees on Tuesday.
"The weather's looking to be quite settled in places but it does come with some bitter, cold winter temperatures in the low single digits and with overnight frosts," MetService meteorologist Dan Corrigan said.
A deluge of rain overnight has isolated a small town north of Auckland.
Surface flooding has submerged Puhoi's town centre, with the river that runs through the area overflowing.
A local told Newshub his car narrowly missed becoming stranded before he moved it to higher ground.
The main road into Puhoi from State Highway 1 was closed, with police assisting with the response, while the nearby suburb of Orewa saw 56mm of rain in the past 12 hours.
Wild weather in Wellington caused a major slip on Monday afternoon, which saw 12 households having to spend the night evacuated.
The land came down across the southern end of The Terrace in Central Wellington with engineers expected to assess the damage on Tuesday.
Welfare services are supporting those forced from their homes, which are believed to be mostly students.
Wellington City Council is advising locals to stay away from the area while they work with Fire and Emergency to clear the slip.
The council is also reporting slips and flooding in streets in central Wellington suburbs.
The streets affected are in Wilton, Wadestown, Karaka Bays, Seatoun, Aro Valley and Northland, the council said.
Horokiwi Road near the State Highway 2 intersection in Petone has reopened to traffic but is down to one line in places after a slip on Tuesday morning.
The Interislander said the Kaitaki ferry is running behind schedule on Tuesday after strong winds in Picton meant it needed assistance from a tug boat to berth on Monday evening.
"We are estimating that the 8:45am sailing exiting Wellington won't depart until closer to 12 noon. We will send updates to confirm. The 2:15pm sailing from Picton is likely to depart at around 5:30pm," Interislander said.
The Aratere ferry is running close to schedule while swells on the Cook Strait are still 3-4m, the Interislander said.
There are significant disruptions on the cards for motorists between Blenheim and Nelson on Tuesday.
Trees have fallen on State Highway 6, which is affecting the only direct route between the two towns.
Waka Kotahi said gale force winds have made it too difficult for contractors to start the clean-up.
Other South Island motorists are being asked to take care on the roads - due to significant potholes, snow and ice.
MetService issued a heavy snow warning for Marlborough with 10cm expected on top of what has already fallen.
The forecaster warns heavy snow may disrupt travel in affected areas and could damage trees and powerlines while the cold conditions may cause stress for livestock.
A road snowfall warning is in place for some of the South Island's main roads. Lewis Pass (SH7), Arthur's Pass (SH73), Porters Pass (SH73) and Lindis Pass (SH8) are expected to see periods of heavy snow on Tuesday.
A heavy rain watch is in place for the Ruahine Range near Palmerston North and the eastern hills of Wellington and the hills and ranges of Wairarapa, including the Tararua Range.
A strong wind watch is also in place for Marlborough from Seddon northwards and Wellington with MetService warning south to southeast winds may approach severe gale in exposed places.
