State Highway 2 north of Wellington has reopened after being closed by flooding for part of Sunday morning.
But trains on the Johnsonville line are running 20 minutes late because of a slip on the track. Normal services are expected to resume early in the afternoon.
The Fire Service in Wellington says it has been inundated with weather-related phone calls.
A spokesperson says fire engines have been pumping water out in the worst-affected areas of Lower Hutt, Porirua, central Wellington and the eastern suburbs of Kilbirnie and Hataitai.