A cool day for most thanks to a southerly quarter airflow, expect rain or showers with snow flurries about the South Island ranges, the far south is mainly dry though. North of the Waikato winds come in from the north and temperatures are warmer.

Northland, Auckland, Waikato & Bay Of Plenty
Showers then rain develops in the afternoon for Northland, spreading elsewhere in the evening, there may be one or two isolated heavy falls develop. Northerlies, tending easterly later in the day for Waikato and Bay Of Plenty.
Highs: 17-20

Western North Island (including Central North Island)
Rain eases to spits or showers around midday. Winds from the southeast, strong about the coast.
Highs: 11-16

Eastern North Island
Rain, possibly heavy overnight for Hawkes Bay and Gisborne. South to southeasterly winds.
Highs: 13-17

Wellington
Rain eases to showers in the afternoon, fresh southeasterlies, strong to gale force winds through Cook Strait.
Highs: 10-11

Marlborough & Nelson
Showers ease in the afternoon becoming infrequent, fresh southeasterlies.
Highs: 12-14

Canterbury
Showers, perhaps some rain especially inland, easing from afternoon and clearing evening. Snow may fall as low as 400 in the morning. Southerlies ease.
Highs: 10-11

West Coast
Sunny for Fiordland, further north expect cloud with showers or spits Greymouth northwards clearing in the evening. Southeasterly winds.
Highs: 14-15

Southland & Otago
Partly cloudy for Southland, chance of a shower otherwise dry. Otago is mostly sunny, some cloud develops in the afternoon nearer the coast. Light south to southeasterly winds.
Highs: 10-12