A northerly airflow strengthens over the South Island today meanwhile the North Island sits under some high pressure.

Northland, Auckland, Waikato & Bay Of Plenty
Mostly sunny after any morning fog clears, some high cloud later in the day. Light winds.
Highs: 16-18

Western North Island (including Central North Island)
Mostly sunny with some high cloud spreading in from the west afternoon onwards, some mid level cloud about Kapiti and perhaps Taranaki. North to northwesterly winds.
Highs: 13-16

Eastern North Island
Mainly sunny with some high cloud later in the day, light winds.
Highs: 16-18

Wellington
Cloudy areas, strong northerlies may rise to gale at times afternoon onwards, especially through Cook Strait.
High: 14

Marlborough & Nelson
A mostly sunny morning then high cloud increases from afternoon, overnight spits or showers for Nelson and the Sounds. North to northwesterly winds strengthen in the evening.
Highs: 14-17

Canterbury
Morning sun possible then expect thickening high cloud, overnight heavy rain moves into the high country with a few spits for South Canterbury. North to northwesterly winds, possibly strong from afternoon, easing overnight.
Highs: 14-17

West Coast
Mostly cloudy, showers for South Westland turn to heavy rain in the afternoon. Rain pushes into North Westland late afternoon or evening then Buller before midnight. Heavy rain eases about Fiordland later in the evening as strong northerlies change westerly,
Highs: 12-15

Southland & Otago
High cloud, rain develops late afternoon or evening (heavy in the west, Lakes District etc). Rain clears overnight for Southland as northerlies change westerly, rain eases to showers overnight for Otago. Coastal Otago has a mainly dry day with only a few spits overnight.
Highs: 16-17