Photo: MetService
Metservice is forecasting heavy rain and thunderstorms throughout the night across the top of the North Island, down to Waikato.
It's also warning of localised downpours which could cause surface or flash flooding and slips.
An orange heavy rain warning is in place for Northland until 6am Tuesday.
"Streams and rivers may rise rapidly. Surface flooding, slips, and difficult driving conditions possible," MetService said.
In Auckland, fire crews were clearing damaged trees and power lines on Monday night as strong winds and heavy rain passed over the city.
Fire and Emergency said it responded to three weather related calls in Auckland, including a damaged power pole in Dairy Flat.
That caused a power outage covering a large portion of the rural community.
A severe thunderstorm watch in place for Northland, Auckland, Great Barrier Island, Coromandel Peninsula and Waikato until 6am Tuesday.
And a heavy rain watch is in place for Auckland, and Waikato north of Cambridge until 6am and The Tararua Range until 2am Tuesday.
Meanwhile, in Nelson flash flooding has caused manhole covers to erupt, as locals watched cows being washed down rivers.
