Three fishermen from Ambalangoda and Dodanduwa were among the deceased, The Daily Mirror reported citing police.
The radio signal installations in Galle and Matara have been damaged due to strong winds in the region.
Meanwhile, the Meteorology Department said that the deep depression in the Arabian Sea was now located at 300 km to the west of Colombo and heavy rains with strong winds can be expected further in the deep and shallow sea areas around the island.
"We advise the public to be vigilant even in the next couple of days," Disaster Management Minister Anura Priyadarshana Yapa said in a press conference in Colombo. (ANI)