The Wellington coastal community of Makara will remain cut off overnight after flooding on both access roads.
The community west of the city was isolated after steady rain, which caused slips and flooding today in central New Zealand.
A Wellington City Council spokesman said sections of Makara Beach Rd and the Takarau Gorge Rd, between Makara and Johnsonville, were flooded.
The roads will remain closed until 7am tomorrow, when engineers would assess whether the flooding had caused any damage.
The heavy rain also closed the South Island's main road after a slip on State Highway 1 south of Blenheim.