MetService has issued a severe weather warning for heavy rain in the eastern and northern parts of the country.
It says up to 160 millimetres is expected to fall in the Coromandel Peninsula and Bay of Plenty, west of Whakatane by Monday night.
It says heavy rain has hit Northland but is expected to clear up by Monday morning.
MetService duty forecaster, Heath Gullery, advises people in those areas to watch out for flooding, slips and rapidly rising streams and rivers.
Mr Gullery says there is a heavy rain watch in place for Auckland, Eastern Bay of Plenty, Gisborne and Hawke's Bay.
He says the stormy weather should ease by Tuesday morning.