A westerly airflow sits over over New Zealand on Tuesday, while a high moves in from the Tasman Sea.

A front and accompanying southerly change moves over the lower South Island in the morning, before the upper South Island in the afternoon or evening.
The same front then reaches the lower North Island overnight.

Rain or showers are in store for most parts of the South Island, though Canterbury is mostly sunny in the morning, and Marlborough & Nelson stay fairly dry with sun for much of the day.

The North Island has cloudy areas in the west, and mainly sunny weather out east.
There’s the chance of an isolated shower or two for Hawkes Bay and Gisborne in the late afternoon or evening, but otherwise a mainly dry day.

– Aaron Wilkinson & Drew Chappell, WeatherWatch.co.nz