A front moves across the North Island slowly and disintegrates as it does so, meanwhile another band of heavy rain moves back up the South Island, mainly on the West Coast.

NORTH ISLAND:
Patchy rain and showers moves across the North Island today, mainly this morning with heaviest falls most likely in the west. It may be mainly dry in the lower half of the island, especially towards the south and south west. Much of the North Island should be dry by later today.
Highs:15 to 21

SOUTH ISLAND:
Mainly places are dry to start with today although a few coastal showers are possible. Rain returns this morning to Fiordland then slides up the West Coast this afternoon with HEAVY RAIN highly likely – watch for slips, possible flooding. See MetService for tax funded Rain Warnings. This rain event will slowly intensify across Sunday PM and may not ease for 24 hours – followed by a cold, wintry southerly which will ease by Tuesday. Elsewhere Sunday is mainly dry with late cloud and some spillover rain (lighter and patchier) across southern and eastern regions. Check your local hourly forecast for more specifics.
Highs: 12 to 18

– WeatherWatch.co.nz