A small but intense area of low pressure forms on a frontal zone then moves over the North Island today coming out of the Tasman Sea, meanwhile a southwesterly airflow lies over the South Island.

Northland, Auckland, Waikato & Bay Of Plenty
Rain (possibly heavy, more so about Waikato) then easing to showers late afternoon as breezy northwesterly winds change fresh southwest.
Highs: 15-17

Western North Island (including Central North Island)
Rain, becoming heavy in the morning then easing from afternoon as southwesterlies gradually freshen.
Highs: 12-14

Eastern North Island
Patchy rain about Wairarapa, becoming heavy by midday then easing during the afternoon as southwesterlies freshen. High cloud further north, may be a spit then rain develops in the afternoon as southwesterlies strengthen, rain clears in the evening.
Highs: 14-19

Wellington
Patchy rain, clearing around midday. Cloud breaks later in the day. Light winds.
High: 13

Marlborough & Nelson
A mix of sun and cloud, may be an isolated shower in the afternoon / evening (mainly inland) about Marlborough. Light winds for Marlborough, southwester lies for Nelson.
Highs: 15-16

Canterbury
Mostly sunny, cloud builds in the afternoon especially inland as light winds tend southerly for a time then easterly. A few isolated showers come with these clouds, once again mainly inland about the foothills, a few may spread to the coast in the evening otherwise staying mainly dry there. Showers clear at night.
Highs: 13-15

West Coast
Cloudy areas and occasional showers, southwesterly winds.
Highs: 10-12

Southland & Otago
Occasional showers about Southland, longer dry spells from midday. Otago has a dry start with some sun then an isolated shower or two from afternoon. West to southwesterly winds.
Highs: 9-13

By Weather Analyst Aaron Wilkinson – WeatherWatch.co.nz