Saturday sees a north to northeasterly airflow increase over New Zealand during the day then a large and deep low moves towards the western side of South Island later in the day / overnight.

The upper North Island sees a few sunny spells however high cloud will thicken, the odd light shower possible from evening then expect overnight rain. North to northeasterly winds pick up from afternoon becoming strong about some coastal areas overnight.

High cloud thickens about the lower North Island although the east coast may see areas of sun last a little longer into the day bringing warm afternoon temperatures for some areas just inland away from the coast. Areas of rain move into the west from evening spreading into the east coast later on / overnight. North to northeasterly winds freshen here also becoming strong overnight in some coastal areas.

Cloudy for the West Coast of the South Island, drizzle from afternoon turns to rain late afternoon / evening then becoming heavy. Thunderstorms possible overnight for North Westland. Marlborough and Nelson especially will see heavy rain later in the evening / overnight.

Canterbury sees high cloud thicken from morning, patchy rain or drizzle from late afternoon / evening then rain moves in overnight. Northeasterlies freshen becoming strong overnight about the coast. Otago sees similar conditions although rain may become heavy overnight.

Southland sees thickening high cloud, patchy drizzle from afternoon then some overnight rain, easterlies freshen tending southeast overnight.