Cyclone Harold, a Category 5 storm with winds in excess of 251 km/h passed through the Solomon Islands, Vanuatu, Fiji and Tonga, cutting power and destroying holiday resorts.
Dozens of people were killed when they were swept off a ferry off Solomon Islands.
Tonga's government said on Friday the island of 'Eua was without electricity and a number of houses were damaged, but no deaths had been reported.
Although no deaths were reported in Fiji, 26 people were injured and more than 6,000 people were evacuated from their homes during the storm.
"#CycloneHarold may be gone, but coronavirus is still in our midst," Prime Minister Frank Bainimarama said in a message posted on his Facebook page. "We must all remain vigilant and keep to every public health directive we have in place."
Although Fiji has just 15 coronavirus infections and no deaths, unnecessary gatherings of more than 20 people, among other curbs, have been banned and people urged to stay home.
Australia said it has already started helping with the cleanup in Solomon Islands and offered support in Fiji. On Friday, the Defence Ministry said the Air Force will transport emergency supplies to Vanuatu.
The whole Pacific Island region has relatively few cases of Covid-19, but much of the region has restricted personal movement to slow any spread of the coronavirus.
The pandemic threatens devastation to most of the health systems across the region, where there is widespread lack of capacity to cope with disease outbreaks. Mindful of this, Pacific Islands authorities are in many cases taking a firm line with their measures.
Solomon Island police imposed a curfew on the nights of 10 April and 11 April, restricting the movement of people. Fines of thousands of dollars and imprisonment will apply for breaching the law.
"Do not go out unless it is critical," Acting Commissioner of Police Mostyn Mangau was cited as saying in a statement posted on the government's website on Friday.
"Let us work together with the government as it tries its best to protect us all and our children from COVID-19."