Heavy rainfall had been measured in large parts of the Eastern Cape up until 8am Monday morning.
The catchment areas of Nelson Mandela Bay's main supply dams, which are all overflowing, were among them.
Joubertina received 43.4mm, Patensie 49mm, Kareedouw 60mm and Kouga 34.5mm.
The PE Airport received 53.8 millimetres and the 3rd avenue dip in Newton Park 69.6mm.
The highest figure measured was at Elands River with 75.2 millimetres while Uitenhage received 27.6mm
The Garden Route also had heavy falls with George recording 63 millimetres, Plettenberg Bay 64mm and Mossel Bay 37mm.
In the East of the province, Port Alfred received 54 millimetres and East London 55mm.
There were some good falls in the interior as well, with Grahamstown receiving 32 millimetres, Graaff-Reinet 19.6mm, Addo 25mm, Bedford 28mm and Queenstown 12.4.mm
The PE branch of the SA Weather service says the rain will gradually start clearing from the west during the course of Monday.
Meanwhile, the Eskom Media Desk in the Eastern Cape said its technicians were working on restoring power to customers affected by inclement weather conditions.
It says they've been busy since Sunday night trying to bring back on line thousands of customers in various parts of the country.
The most affected areas include Butterworth, Idutywa, Willowvale, Qunu, Mqanduli, Port St Johns, Lusikisiki, Flagstaff and surrounding villages.
Eskom says they're hoping to restore power as soon as possible and that customers must treat all electricity appliances as live at all times.
