The far south of the South Island has some sun on Sunday, very heavy frosts to start the day inland. Light showers clear in the morning for Canterbury, rain about Nelson and Tasman eases to showers, clearing evening along with showers for Marlborough. Showers clear in the afternoon for Buller and the West Coast north of Hokitika. Snow furries to 300m for Canterbury, 400m for Marlborough and 600m about the Nelson ranges clear. Winds are fairly light in the east thanks to high pressure, the West Coast has easterlies which are drawn into an area of low pressure in the Tasman Sea.
Rain or showers for the lower North Island, clearing away for the east coast and Central North Island in the evening. Snow flurries to 700m for the ranges of Wairarapa clear. The upper North Island has partly cloudy skies, the odd shower, showers more likely from afternoon with thickening cloud then rain moves in overnight coming in from the north. Northerly winds for the upper North Island, southerlies further south, winds tending to the east for all in the evening.
Very heavy frosts for the South Island on Monday morning, heavy rain starts to spread southwards over the North Island from afternoon. Heavy rain for the North Island and upper / eastern South Island on Tuesday next week thanks to a large deep low. Some heavy snow for Tuesday about the inner South Island high country, the heaviest snow will be higher up but lesser amounts may reach down to 500m.
Winds on Tuesday moving around the forecasted low look to be strong.