Cook Islands Meteorological Office director Arona Ngari said they recorded 72 millimetres of rain from 6.40am to 12 noon.
This resulted in blocked drains that caused flooding to some sections of Rarotonga’s roads.
As of 8am yesterday, Ngari said they recorded 202.2mm of rainfall on the island since January 1.
The long term average for January is 241mm, he added.
Ngari said the recent downpour was due to the cyclone season and the activeness of the South Pacific Convergence Zone (SPCZ).
According to Wikipedia, SPCZ, a reverse-oriented monsoon trough, is a band of low-level convergence, cloudiness and precipitation extending from the Western Pacific Warm Pool at the maritime continent south-eastwards towards French Polynesia and as far as the Cook Islands.
“We arrived at the tail end, or most eastern part of the activeness of the SPCZ, so there is no actual depression formed in the western part of the zone. The alignment of it in a north-west south-east direction actually lies between Fiji and us. This seems to create this activeness and thus we are having this short duration of rainfall on a regular basis,” Ngari said.
“We expect this to continue. On the positive side we prefer to have rain rather than strong winds to come through. We are closely monitoring the rainfall.”
Earlier in the week, Titikaveka recorded 80mm of rain from 8pm on Tuesday night to 8am on Wednesday morning.
Ngari said they would continue to keep a close watch on the weather and keep the public updated through their regular updates on their Facebook page and local media.