A colder change moves over the North Island while a large high expands over the South Island and into the North Island. This will help clear rain and showers away from northern NZ as the day goes on.

The high also means much colder nights with some of the heaviest frosts of the year tonight in some South Island regions.

NORTH ISLAND:
Rain and/or showers eases today, mostly in eastern, northern and maybe central parts of the island first thing. By afternoon showers linger in the east around Wairarapa, Hawke’s Bay and Gisborne, also further north around Coromandel Peninsula and Northland. There’s a chance rain could linger all day in Northland and maybe some parts of northern Auckland. Fresh cold SE winds for many. Chance of a frost tonight inland in sheltered areas.
Highs: 4 to 15

SOUTH ISLAND:
Heavy frosts for some places first thing thanks to a large high pressure system expanding over the island. A few light showers or drizzle possible in northern Canterbury up to about Kaikoura but should clear this morning. Dry and sunny with light winds elsewhere. HEAVY FROSTS tonight inland. Sunniest and mildest in the north and west.
Highs: 6 to 11

– WeatherWatch.co.nz