On Monday night, a large area of low pressure will develop in the Southern Ocean, creating a large storm which will span thousands of kilometres and brush New Zealand and southeastern Australia.
WeatherWatch has described it as "one of the larger storms in New Zealand this year".
The area most impacted by rain will be the West Coast, with slips, flooding and road closures possible over the next seven days, WeatherWatch reported.
Snow could top the ranges too. Winds will be strongest in the east, but especially around the mountains and Cook Strait next week.
On Monday night and across Tuesday a surge of gale-force winds are expected to move up the South Island, Cook Strait and the lower North Island.
It will affect the eastern side of the South Island and Wellington and southern Wairarapa. Wind warnings may be possible for a time.
Over Wednesday and Thursday, gusty northwesterly winds could blow for some regions including Wellington, Cook Strait and through the Southern Alps but it won't be as blustery as on Tuesday.
The ridge over us moves away tomorrow and northerlies start to pick up ahead of an approaching front. However, much of the country can expect a warm start to the summer. Find more details on your towns forecast at https://t.co/Yjbq0jfCz1 ^Tahlia pic.twitter.com/a8CYn1n6Zi
On Thursday, a pool of slightly cooler air will brush the West Coast, Southland and coastal Otago.
Wellington has a bit of a windy week ahead but only Tuesday has the severe gale risk.
But not everyone will be hampered by the poor weather.
The eastern North Island north of Masterton should enjoy fine weather. That included Hawke's Bay, which has no rain forecast for the next 10 days and could enjoy highs of up to 30C, and the Gisborne region.
Here are maximum temperatures recorded today. Hanmer Springs the hottest at 30C, followed by Alexandra at 28C and Palmerston North at 27C. Low cloud over the Chatham Islands saw them creep up to 17C, Kaikoura, Christchurch, Hokitika and Milford Sound a little warmer at 18C. ^AB pic.twitter.com/aOvzK6SYgP