Areas of northern Tairawhiti are expecting heavy rain after being hit twice in the space of three weeks earlier this year.
An orange heavy rain warning is in place for Tairawhiti, Northland, Auckland including Great Barrier, Coromandel and the Bay of Plenty.
Coromandel had heavy rain overnight, Auckland and Waikato have had thunder, while downpours, thunderstorms and strong winds were heading towards other parts of the North Island on Monday morning.
In Tairawhiti the region was under an orange rain warning, with up to 150mm expected north of Ruatoria.
Gisborne District Council civil defence manager Ben Green told Morning Report there was a large mass of moist air off the top of the East Coast.
"Over the course of this morning we're assessing where that track is likely to go," he said.
Areas that have been hit hard in the last few months may be under threat.
"Areas that suffered quite significant damage - that's where probably that's not a good scenario if we have a repeat of that."
MetService meteorologist Jessie Owen said Coromandel had experienced significant range.
"Some stations in the ranges have recorded up to 25mm just in a single hour," she said.
"Be on guard, be careful when you're driving."
"There are more bands and showers on the radar coming through and several bands behind it."
"With the heavy rain through Bay of Plenty and the northern parts of Tairawhiti, it's only the very northern part of Tairawhiti, north of Ruatoria, so Gisborne City itself is not going to see as much rain."