MetService has issued a series of orange and red heavy rain warnings for Northland, Auckland, Coromandel and Bay of Plenty from tomorrow.
The warnings have been triggered because of the likely impacts - significant flooding, slips, and further damage to roads and power networks, MetService said.
"Previous heavy rainfall since Friday means that these regions are already saturated, still cleaning up from the last event, and are vulnerable to further heavy rain."
On Tuesday, there is the added risk of thunderstorm from Northland on Monday and spreading over northern Auckland from Tuesday evening and then further south into Coromandel on Wednesday.
Thames Coromandel Civil Defence Controller Garry Towler is warning residents across the region to prepare for the next bout of bad weather.
"The regional council have serious concern that the land stability that the land around the Coromandel could be compromised due to sheer saturation.
"That means that lives on a hilly section needs to keep an eye on are there any cracks and that sort of thing, because there is evidence that's starting to occur."
Meanwhile, the Ministry of Education has directed all Auckland schools, early childhood services and tertiary institutes must remain shut for physical instruction until 7 February.
Principals were told the instruction was issued after the National Emergency Management Agency asked the ministry to help minimise traffic on Auckland roads while vital infrastructure is repaired.
Look back on how Monday's weather updates unfolded here: