Weather: 'Complex low' brings more rain and wind to New Zealand

Much of New Zealand is at risk from deteriorating weather for the rest of the week, despite a front leaving the country on Wednesday.

"That [front] departs this morning, but a complex low-pressure system then moves in from the Tasman later today, bringing rain or showers to many parts of the country," MetService says.

Falls are expected to become persistent again in Auckland on Wednesday evening, after 22.2mm fell on Tuesday. Strong westerly winds are also possible.

A heavy rain watch is in place for Bay of Plenty including Rotorua with falls expected between 9am Wednesday and 11pm Thursday. In Waitomo, Taumaruni, Taupo, northern Taranaki and Taihape, heavy falls are possible between 2am Thursday and 8am Friday.

"Brief periods of rain are expected to return from Thursday morning, especially east of Te Puke, with possibly heavy and thundery falls, and rainfall accumulations may approach short duration warning criteria," MetService says.

"Heavy rain about Mt Taranaki has eased this (Wednesday) morning. However, brief periods of rain, with possibly heavy falls and thunderstorms are expected to return from early Thursday morning and spread across the central high country."

And there's more bad news for Aucklanders with a strong wind watch in place for early Friday morning.

"Northwest gales may become severe in exposed places," MetService warns.

Meteorologist Andrew James said the systems were expected to start affecting the country from Tuesday.

"Everywhere gets some wind and rain this week," he said. "The features come in quick succession, so there won't be too many breaks in between them."

WeatherWatch says rain or showers will intensify on Thursday, warning of "isolated thunderstorms and heavy downpours - mainly along the western coastline".