An anticyclone covers most of New Zealand today.

Northland, Auckland, Waikato & Bay Of Plenty
Some morning sun for Northland and perhaps Auckland, cloudy areas otherwise with the risk of a shower or two, more so in the afternoon. Light winds then afternoon sea breezes.
Highs: 23-25

Western North Island (including Central North Island)
Mostly sunny with light winds tending west to southwest in the afternoon.
Highs: 20-24

Eastern North Island
Mostly cloudy about Hawkes Bay and Gisborne, a light shower or two is possible in the ranges. Some sun may break through about coastal fringes at times in the afternoon. The Wairarapa starts out mostly sunny then some cloud develops in the afternoon. East to northeasterly winds.
Highs: 20-22

Wellington
Mostly sunny, perhaps a few clouds from afternoon. Light southeasterly winds.
High: 20

Marlborough & Nelson
Mostly sunny with a touch of high cloud, afternoon north to northeasterly winds.
Highs: 20-22

Canterbury
Mostly sunny with some high cloud, east to northeasterly winds.
Highs: 18-20

West Coast
Mostly sunny with light winds then afternoon west to southwesterly winds, there may be some morning cloud about North Westland.
Highs: 18-24

Southland & Otago
A few morning showers for Southland then afternoon sunny spells, westerlies tend a little more southwest in the afternoon and freshen. Central Otago is mostly sunny, perhaps a touch of high cloud. Coastal Otago has a mostly sunny morning then a few clouds drift in from afternoon as light winds tend easterly.
Highs: 16-23

By Weather Analyst Aaron Wilkinson – WeatherWatch.co.nz