On Wednesday we have a southwesterly airflow over New Zealand; a front moves northwards over the North Island while another pushes up over the South Island during the day.

From Southland through to Canterbury in the east, showers will arrive at some point during the day.
Nelson and Marlborough on the other hand may remain fairly dry – till evening or overnight.
The West Coast of the South Island is looking fairly dry too, though there is the chance of an isolated shower in the evening, as westerlies tend southwest.

For the North Island, morning showers clear in the southwest (Taranaki to Kapiti) before sunny areas develop.
Meanwhile for the Northeast (Northland through to Bay Of Plenty), you can expect some morning sun, before showers develop in the afternoon.
There is a chance these could turn heavy, with thunderstorms about the Bay of Plenty in the afternoon, before easing later in the evening.

For Gisborne through to the Wairarapa you can expect some morning sun, and then some afternoon showers possibly becoming heavy with thunderstorms here too, mainly about Hawkes Bay and Gisborne.

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