A very broad and weak area of low pressure lies over most of the country, after spending the start of this week under a large, setted high.

South Island

The lower South Island (Southland and Otago) can expect rain or showers in the morning, though this will ease in the afternoon before clearing by evening, along with mostly light winds.

Canterbury will enjoy sunny weather first thing in the morning, but then cloud increases with southerlies, which tend easterly by late afternoon.
There may be a few isolated showers about inland areas in the afternoon and evening, otherwise it should stay mainly dry.

The West Coast sees morning rain about South Westland ease, and most of this will clear by evening.
A few brief showers may make it into North Westland, otherwise expect a mostly cloudy day with west to southwest winds.

Nelson and Marlborough are mostly sunny, as usual, with light winds in the morning, and afternoon east to northeast winds.
There is a chance of an isolated inland shower inland in the late afternoon or evening about hills and ranges.

North Island

A mostly sunny day for Wellington, with northwesterlies tending more southerly in the afternoon.

Sunny with a few clouds about for western North Island areas, light winds in the morning then afternoon west to southwest winds. Winds will be a little breezier about Taranaki in the afternoon.

Sunny on the East Coast, light winds in the morning then afternoon easterlies. 

Mostly sunny about the Central North Island, Waikato, BOP and Auckland.
Winds are from the southwest, and about the Bay of Plenty winds may tend northerly in the afternoon. 

Northland is mainly sunny with light winds in the morning, then afternoon sea breezes.

– Aaron Wilkinson & Drew Chappell, WeatherWatch.co.nz

Map: Google