A southwesterly airflow lies over New Zealand today, moving around a large high in the Tasman Sea.

Northland, Auckland, Waikato & Bay Of Plenty
Partly cloudy, risk of a shower (mainly morning). Sunny areas longer from afternoon, Bay Of Plenty becomes mostly sunny from afternoon. Southwesterly winds.
Highs: 16-20

Western North Island (including Central North Island)
Cloudy areas, risk of a shower otherwise mainly dry. Some sun may break through about coastal areas from afternoon. Westerly winds, tending southwest for Taranaki.
Highs: 14-17

Eastern North Island
Sunny, light winds.
Highs: 17-20

Wellington
A mainly sunny day with northerly winds.
Highs: 17-18

Marlborough & Nelson
Sunny. Light winds for most, they may tend northeast in the afternoon about coastal Marlborough. Southwesterlies for most of the day about Nelson but they could tend light northerly in the afternoon.
Highs: 18-21

Canterbury
Mostly sunny, a touch of high cloud possible. Light winds tend onshore in the afternoon near the coast and cloud thickens up by evening.
Highs: 16-18

West Coast
Mostly cloudy with occasional showers, dry spells increasing from afternoon and some sun may break through about North Westland. Some rain moves into Fiordland in the evening. Buller especially inland may have a mainly dry day. West to northwesterly winds.
Highs: 14-16

Southland & Otago
Mostly cloudy about Southland and coastal Otago, a few morning showers move through, becoming mainly dry in the afternoon however a few evening spits of rain are possible about Southland. Central Otago has morning mid level cloud break to afternoon sun and high cloud. Southwesterlies die out in the afternoon.
Highs: 13-17

By Weather Analyst Aaron Wilkinson – WeatherWatch.co.nz