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Spring starts this weekend but it looks like a cool start to the season for southerners, with snow expected in some areas.
MetService says a front is forecast to move across the country on Sunday, bringing heavy rain to western parts of both islands.
During Sunday and Monday, a showery and cold west to southwest flow could bring snow to about 400 metres over Southland and Otago.
Weatherwatch.co.nz said the snow could affect the mountain passes on southern roads.
A deep low should pass to the south of the country during this time, and there is a chance of gales becoming severe about Southland, Clutha and Dunedin.
On Tuesday, a ridge develops over the lower South Island, while cold southerlies persist over central and northern New Zealand.