With a death toll nearing three dozen, rescuers are searching for survivors among the Florida homes ruined by Hurricane Ian, while authorities in South Carolina have begun assessing damage from the powerful storm's strike there as stunned residents began the painstaking task of surveying their losses.

Ian, one of the strongest hurricanes ever to hit the US, terrorised millions of people for most of the week, battering western Cuba before raking across Florida from the warm waters of the Gulf of Mexico to the Atlantic Ocean, where it mustered enough strength for a final assault on South Carolina. The storm was expected to weaken through the day as it moves across the mid-Atlantic.

At least 31 people were confirmed dead, including 27 people in Florida mostly from drowning, but others from the storm's tragic after effects. An elderly couple died after their oxygen machines shut off when they lost power, authorities said.

As of this morning, more than 1000 people had been rescued from flooded areas along Florida's southwestern coast alone, Daniel Hokanson, a four-star general and head of the National Guard, told The Associated Press while airborne to Florida.

Chris Schnapp was at the Port Sanibel Marina in Fort Myers, waiting to see whether her 83-year-old mother-in-law had been evacuated from Sanibel Island. A pontoon boat had just arrived with a load of passengers from the island — with suitcases and animals in tow — but Schnapp's mother-in-law was not among them.

"She stayed on the island. My brother-in-law and sister-in-law own two businesses over there. They evacuated. She did not want to go, thinking it wasn't going to be bad," Schnapp said. But then she got word last night that her mother-in-law would be arriving at the marina: "Now we don't know if she's still on the island or gotten on a bus," and was taken to a shelter, Schnapp said.

South Carolina's Pawleys Island, a beach community about 117km up the coast from Charleston, was among the places hardest hit by Ian, and power remained knocked out to at least half of the island Saturday.

Eddie Wilder, who has been coming to Pawleys Island for more than six decades, said Friday's storm was "insane to watch." He said waves as high as 7.6m washed away the pier — an iconic landmark — just two doors down from his home.

"We watched it hit the pier and saw the pier disappear," said Wilder, whose house sits about 9m above the ocean and stayed dry inside. "We watched it crumble and watched it float by with an American flag still floating."

The Pawleys pier was one of at least four along South Carolina's coast to be destroyed during Ian's winds and rain. Portions of the pier, including barnacle-covered pylons, littered the beach. The intracoastal waterway was strewn with the remnants of several boat houses knocked off their pilings in the storm.

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Traffic was shut off to Pawleys Island's southernmost point, where crews were working to clear roadways of sand and other debris that officials said has been piled at least a foot high. The sand will later be redistributed to build back the dunes along the beach front, as happened after a similar event in 2019.

Many of the elevated beach homes still had feet of sand underneath, with dunes completely washed over and nearly flattened.

John Joseph, whose father built the family's beige beach house in 1962, said he was elated to return from Georgetown — which took a direct hit — to find his Pawleys Island home entirely intact.

"Thank God these walls are still here, and we feel very blessed that this is the worst thing," he said of the sand swept under his home. "What happened in Florida — gosh, God bless us. If we'd had a Category 4, I wouldn't be here."

In North Carolina, the storm appeared to have mainly downed trees and power lines, leaving over 280,000 people across the state without power this morning, according to state officials.

At least one fatality connected to the storm was reported in Johnston County, outside of Raleigh. A woman found her husband dead after he went to check on a generator running in their garage overnight, sheriff's office Captain Jeff Caldwell said.

The storm's winds were much weaker yesterday than during Ian's landfall on Florida's Gulf Coast earlier in the week. Authorities and volunteers there were still assessing the damage as shocked residents tried to make sense of what they just lived through.

"I want to sit in the corner and cry. I don't know what else to do," Stevie Scuderi said after shuffling through her mostly destroyed Fort Myers apartment, the mud in her kitchen clinging to her purple sandals.

This morning, a long line of people waited outside an O'Reilly's auto parts store in Port Charlotte, where a sign read: "We have generators now." Hundreds of cars were lined up outside a Wawa gas station, and some people walked, carrying gas cans to their nearby cars.

At Port Sanibel Marina in Fort Myers, charter boat captain Ryan Kane was assessing damage to two boats after the storm surge pushed several boats and a dock onto shore. He said the boat he owns was totalled. He said he couldn't use it to help rescue people, and it would be a long time before he'd be chartering fishing clients.

"There's a hole in the hull. It took water in the motors. It took water in everything," he said, adding: "You know boats are supposed to be in the water, not in parking lots." - AP