Around 30mm of rain fell and temperatures dropped to single digits in and around Whanganui over Wednesday night.
MetService meteorologist Peter Little said the most rain recorded around the regions from 9am Wednesday to 9am Thursday was 32.3mm at Santoft, between Marton and Bulls.
Whanganui Airport recorded 29.2mm, while Flat Hills in the Rangitīkei District got 21.2mm.
In Ruapehu, Raetihi got 23.6mm, Ohakune got 20mm and in South Taranaki Hāwera recorded 29.6mm.
Temperatures overnight dipped into single digits across the region, with a low of 7.2C recorded at Whanganui Airport, 4.1C in Raetihi, 2.2C in Waiouru and 6.4C in Hāwera.