A northwesterly airflow builds on Saturday bringing warm temperatures for eastern regions, a front moves onto the lower South Island in the evening then pushes northwards overnight. This front continues northwards on Sunday pushing over the North Island during the day.
Some cloud and the risk of a shower for the western North Island on Saturday, showers more likely Taranaki southwards. Dry in the east with some developing high cloud. Rain or showers for the West Coast of the South Island, becoming heavy about South Westland around midday with a chance of thunderstorms then further north in the evening. Mainly dry out east with some developing high cloud, temperatures will be quite warm for the time of year getting into the high teens. Rain moves into Southland / Central Otago in the evening, moving into other parts of Otago and Canterbury overnight.
Heavy rain about North Westland eases in the morning pushing onto the western North Island, rain may be heavy with thunderstorms. A dry morning along the North Islands east coast then some afternoon rain, clearing evening. Rain or showers about Southland / Otago for much of the day, Canterbury sees some morning rain or showers clear then sun breaks through, by evening showers move back in south of about Banks Peninsula. Marlborough sees rain, easing in the afternoon and clearing.
By Weather Analyst Aaron Wilkinson – WeatherWatch.co.nz