Strong, gusty winds will accompany the heavy rain, with possible wind damage across many regions.
It comes just days after a state of emergency was declared in Buller and Marlborough.
"They'll be coming in for weeks, if not months."
There were numerous road closures and surface flooding due to the 'once-in-a-decade' weather event.
Some who have been able to return have had their lives turned upside down.
"It's still far too early to say the winter weather is over."
Many were forced to flee their properties at the weekend.
The aftermath of the damaging floods is expected to be revealed.
Here's the latest.