On Wednesday we have a low pressure system that is centred over the Gisborne area, and the rest of the northeast of the North Island during the day.
For the lower North Island, we have a southeasterly airflow, and over the upper North Island we have a west to southwesterly airflow.

Most fo the South Island sits under an east to southeasterly airflow.
Most winds across New Zealand are breezy to brisk, especially around the upper South Island and lower North Islands from the southeast.

It’s looking cloudy for most of the North Island, with showers for the upper half of the island, along with westerly quarter winds.
Southeasterlies for the lower half of the North Island will be strong for some, along with heavy rain at times for southern Hawkes Bay and the Wairarapa.

For the South Island, thick high cloud dominates out west, though it will stay dry, with breezy southeasterly winds.
Mainly cloudy skies in the south and east of the island, with patchy rain or drizzle from Canterbury northwards.
There’s heavy rain possible in Marlborough, and also North Canterbury.

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