The Christmas and New Year sunshine is set to be blown away this week by severe rain and possible thunderstorms, forecasters are warning.
Heavy rain warnings are now in place for Auckland, Northland, Coromandel Peninsula, Bay of Plenty, Rotorua, Mount Taranaki, Nelson, Marlborough, and the Kaikoura Coast.
Currently building off north eastern Australia, the low pressure front will hit New Zealand's north on Thursday, dumping 70-90mm of rain on Auckland between midday and midnight, the MetService says.
The Super City is also expected to experience winds gusting up to 120 kilometres per hour.
Strong winds will also buffet Northland, Great Barrier Island and Coromandel Peninsula, possibly damaging trees and powerlines and making it hazardous on the roads for tall trucks and motorbikes.
The low pressure front will then travel south on Thursday bringing heavy rainfalls up to 150mm-and-160mm on Bay of Plenty and Mt Taranaki before hitting the top of the South Island in the early hours of Friday.
The front is expected to clear the country by Saturday.
Fellow forecaster WeatherWatch says the front has a chance to reach severe levels what it describes as a "weather bomb".
Weather bombs occur when central air pressure drops by 24 hectopascals in 24 hours.
The dramatic drop in air pressure is likely to bring torrential downpours and flash flooding in some regions and posed a particular risk to trampers, swimmers and boaters, WeatherWatch said.
It was likely to bring rough seas up to 7 metres high and strong rips on both the western and eastern coastlines of the North Island.