Authorities say that most of the deaths were due to mountainsides collapsing on homes.
An army officer sits on top of a moving armoured personnel carrier as a house is seen on a flooded road during a rescue mission in Bulathsinhala village, in Kalutara, Sri Lanka.
The early rainy season downpours have forced hundreds of people from their homes across the Indian Ocean island.
Maj Gen Sudantha Ranasinghe, who was leading the search and rescue mission, doubted that any survivors would be found. Earth and rocks had crashed down in such a way that survival was unlikely and most of the affected places were still flooded, making access hard.
The Sri Lanka Red Cross issued landslide alert Saturday, writing "people living on steep slopes and near risky cut-slopes should be watchful".
Indian High Commissioner Taranjit Singh Sandhu said a second larger vessel was expected in Colombo on Monday with more aid.
Seven districts have been severely affected, the worst of which is the coastal Kalutara, where 38 people have died and 80 people are missing.
The Indian aid included a medical team as well as inflatable boats and medicine.
Sri Lankan President Maithripala Sirisena was scheduled to return to Colombo Friday night after a two-day state visit to Australia and plans to hold an emergency meeting with emergency officials to discuss relief operations, an administration official said.
He said India's move to send relief materials demonstrated the Indo-Lanka relations which are at an excellent level. Islamabad recently gave 10,000 tonnes of rice to Sri Lanka to help drought victims.
Sri Lanka's Disaster Management Center (DMC) said in a statement on Saturday that the death toll from the devastating floods climbed to 100.
"The monsoon has firmly established and we could have evening showers at a lesser intensity", meterological department chief S. R. Jayasekera said.
Monsoon rains previous year caused flooding and landslides, killing just over 100 people.