Parts of the South Island are in for a downpour and possible flooding before rain clouds make their way north on Wednesday.
MetService has heavy rain warnings in place for Upper Clutha in Otago and Westland, with streams and rivers expected to rise rapidly in the Westland Ranges due to get up to 120mm of rain expected from this afternoon.
Surface flooding and slips are on the cards, according to the forecast service.
Meanwhile, in the north, Mount Taranaki is bracing for up to 140mm or rain from Tuesday to Wednesday as the clouds move up across the country.
Meteorologists are also forecasting a wintry blast to move up the country, with temperature drops from Wednesday and possible snow in the south.
"The more welcome news is that a broad ridge will move over the country during Friday and bring blue skies and light winds to Aotearoa through much of the weekend," MetService meteorologist Rob Kerr said.