Water levels are gradually receding in many areas but with more rain predicted on Monday residents are scared.
The severe weather has also displaced almost half a million people, and triggered major landslides throughout the country, reports CNN. Sri Lanka on Tuesday said that it was preparing to face health concerns once the floods which lashed the country recede.
After the government's appeal, the United Nations said it was assisting in relief efforts including the donation of tents, water purification tablets, and other supplies for the displaced. An Indian naval ship carrying medical supplies with 125 personnel docked in Colombo, the country's capital, on Saturday and two more will arrive soon.
However, Major-General Sudantha Ranasinghe, who is heading the search and rescue mission, told the AP news agency that he does not expect to find any more survivors.
Friday's flooding was the worst the country has experienced since 2003, when 250 people were killed and 10,000 homes were destroyed after a comparable monsoon.
The rescue, diving and medical teams on board will work in coordination with the Sri Lankan Navy and other authorities, and are now being deployed in the worst affected areas, particularly Ratnapura and Horana.
Sri Lanka's ministry of disaster management says nearly 558,000 people from 15 of the country's 25 districts have been hit by the disaster.
"Although the heavy rainy condition has reduced temporary, showery conditions are likely to enhance again over south-western part of the island from 29th May 2017", the Meteorological Department said, according to PTI.
Pakistan said it was in talks with Colombo to send relief supplies. Additionally, steps have been taken to maintain the health services in the affected areas and the Public Health Inspectors have been given instructions to prevent a possible epidemic situation.
The Chinese Government will give full support to the disaster relief operations of the Sri Lankan Government.
Reuters witnessed some people stranded on the upper floors of their homes and some houses were flooded up to roof level.
A third ship - INS Jalashwa has also left for Sri Lanka.
Sri Lanka, which has been heavily deforested for cash crops, often witnesses landslides during the monsoon season.