Nearly 40mm of rain fell in Whanganui between Friday and Sunday, with more to come for the rest of the week.
MetService meteorologist Jessie Owen said 39.8mm of rainfall was measured between Friday and midday Sunday at the Whanganui Airport weather station.
Owen said the majority of the rainfall occurred between 4pm Friday and 3am Saturday, which was a lot to have fallen in such a short period.
A Whanganui District Council spokesperson said there was some surface flooding reported on Anzac Pde on Saturday night, but it receded fairly quickly.
The highest amount of rainfall in the region was measured at the weather station at Santoft with 64.3mm.