A large anticyclone brings mainly settled and hot weather to New Zealand today, a northwest airflow gradually builds over the South Island during the day.
Expect mostly sunny weather, some high cloud for the upper North Island in the morning slowly breaks away. Winds are from the west or southwest in the west and tend easterly in the afternoon along the east coast. There may be some mid level cloud about Kapiti during the day.
Cloud breaks to sunny spells in the afternoon for the West Coast, cloud thickening up again in the evening about South Westland with drizzle moving in then turning to rain about Fiordland overnight. Mostly sunny for the east coast, some high cloud at times south of about Banks Peninsula. Winds are from the north or northwest, tending northeast in the afternoon along the east coast.
Temperatures reaching into the mid to high twenties for most in the North Island, some places right on the coast may stick to the early twenties due to onshore winds. Conversely some places away from onshore winds warm up quite well, possibly touching or getting near thirty degrees, these spots being Bay Of Plenty and perhaps inland parts of Hawkes Bay / Gisborne.
The South Island has highs in the mid to late twenties from Southland up through to Nelson in the east, parts of Marlborough may touch thirty. The West Coast south of Greymouth has temperatures in the mid to high teens.