MetService has issued a heavy rain warning for parts of the South Island as a front moves in from the Tasman Sea.
Up to 250 millimetres is expected for Fiordland on Sunday, while south Westland could get 300mm on Monday.
Significant rainfall has also been forecast for the headwaters of the Canterbury and Otago rivers south of the Rangitata.
MetService warns rivers and streams in those areas may rise rapidly and slips and flooding are possible.
