The severe weather conditions started on Wednesday night as gusty winds and rains battered parts of the country, and have so far affected more than 77,000 people, officials said.
Power supply, essential services and air traffic was disrupted in the stormy weather that left several buildings damaged and trees uprooted in its wake.
Five people have been reported "missing" and at least 13 people killed since Wednesday night due to rains and storm, the police said.
According to the police, around 4,000 people were being housed in temporary relief camps in Ambalangoda.
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The high winds and persistent rains which hit the island nation on Wednesday later developed into cyclone 'Ockhi', which has affected parts in southern Indian states of Tamil Nadu and Kerala and caused loss to life and property.
Sri Lanka's department of meteorology today announced that 'Ockhi' is now located some 850-km to the west of the island and is moving further away.
"Hence its effect for the country is expected to be lessen gradually," it said in a statement.
Addressing Parliament on Thursday, Prime Minister Ranil Wickremesinghe had said that he had directed officials to pay each family affected by bad weather rupees 10,000 as emergency assistance.
The military was also deployed to assist in the rescue and recovery operations in the wake of the severe weather conditions.
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