Firefighters have been called to dozens of reports of flooding and leaky roofs in Auckland overnight.
Torrential downpours hit parts of Auckland and Coromandel overnight, bringing large amounts of rainfall.
Between 11pm and 2am, Fire and Emergency (FENZ) received 67 calls in relation to weather incidents in Auckland.
Suburbs that faced the brunt of the rain include St Heliers, Kohimarama, Mt Wellington, and parts of South Auckland.
Most of the emergency callouts were for leaky roofs and flooding.
Emergency services also responded to 28 alarm activations in commercial buildings, which were set off as a result of the weather.
Significant downpours were recorded right across Auckland, with Leigh recording 81mm of rain in just one hour.
FENZ also responded to three minor flooding jobs in Putāruru in south Waikato, where crews have been working to stop water from entering buildings and clear blocked drains.
Posts to Facebook suggest several roads in the town are underwater and there is some flooding at the town's supermarket.
It comes after a severe thunderstorm watch was issued for regions across the North Island on Monday night.
MetService put out the notice to those in Northland, Auckland, Great Barrier Island and Coromandel Peninsula, due to an active front masking its way across central and northern parts of Northland.
"There is a moderate risk of severe thunderstorms with this front, especially about coastal areas, with localised downpours of 25 to 40mm/h possible. There is also a chance of a small coastal tornado," the weather agency said.
Meanwhile, a heavy rain warning is in place for Hawke's Bay from 6am today until 6pm Wednesday.
