Emergency services received more than two dozen weather-related calls overnight as the North Island was battered by heavy wind and rain.
Most of the eastern upper North Island has been hit, including Auckland, Coromandel and the Bay of Plenty.
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Fire and Emergency told Newshub it received around 30 weather-related call-outs, mostly for downed trees and powerlines.
Aucklanders heading into work on the motorways could face delays as flooding creeps onto the roads.
One lane headed south at Greenlane was temporarily closed due to flooding, but it has since opened.
Tamaki Dr is once again flooded with images from the scene showing water creeping into the centre of the road.
Freedom campers in Thames had to be moved on from their spot near the airfield overnight as flood waters rose.
Civil Defence Waikato is warning people in the area to avoid waterways and drive carefully.
"Power outages in a few places too so please give the lines [teams] space to work so they can get home safe to their families once they've put your power back on.
"Also wind may have left debris on the roads where you drive so please be extra careful and allow extra time for travel this morning."
A heavy rain watch remains for the Coromandel, but the weather is forecast to ease for most areas by the afternoon.