Severe weather warnings remain as heavy rain and strong winds batter the country.

It comes as parts of Aotearoa remain in clean-up mode following severe weather events earlier this year, such as Cyclone Hale, Cyclone Gabrielle, and Auckland's anniversary weekend floods.

Northland received the most rain overnight, with Kaikohe reaching 200 millimetres in the past 24 hours to 6am.

In Thames-Coromandel, overnight downpours reached 81mm and more rain is expected throughout the day.

At 6am, Auckland was the wettest place in the country, with 25mm overnight, half of that was since 4am.

Intermittent bursts of rain were occurring in the central city.

As the bad weather moved south, MetService said thunderstorms were expected in the Bay of Plenty area.

Fire and Emergency NZ said it had not yet received any weather-related callouts.

As of 6.30am, orange heavy rain warnings were in place for Northland, Coromandel, parts of Bay of Plenty, Tasman, north of Motueka, and Westland, south of Otira.

Yellow heavy rain warnings were in place for Auckland, including the Great Barrier Island, and parts of the Bay of Plenty, including Gisborne.

Yellow strong wind warnings were in place for Auckland and Coromandel.

MetService said the bad weather was being caused by an "active front associated with a subtropical low" that was moving down the country.

It was "slow-moving" and the rest of the week was looking "pretty unsettled", Meteorologist John Law said.

Law said the warnings were being extended to the Bay of Plenty as the day went on and MetService was "keeping a close eye" on the region on Monday and throughout the week.

The weather was also moving down to the South Island where western parts of the Tasman district were expected to "bear the brunt of the rainfall".

Auckland public transport affected

The weather in Auckland ferry services on Sunday, and that continued on Monday.

Auckland Transport said Gulf Harbour ferry services would be replaced with alternative transport because of the weather.

It included the 7.30am, 10.30am and 12.30pm services from Auckland to Gulf Harbour and the 6.30am, 7am, 7.30am, 8.30am, 11.30am and 1.30pm services from Gulf Harbour to Auckland.