A severe weather warning has been issued with big rain expected to hit the region tomorrow.
Metservice meteorologist, Stephen Glassey, said most of Hawke's Bay would experience heavy rain, with 100-120mm expected in the ranges and coastal hills, and 60-80mm elsewhere.
"It's all of Hawke's Bay excluding the Wairoa District, so it's not as bad up in the north of Hawke's Bay."
Glassey said the rain was being caused by a complex low pressure system sitting over the lower North Island.
"We've got quite a complex low pressure system sort of lingering over the eastern North Island."