Stranded residents evacuated by jetski

Fifty-five people stranded on a beach overnight on Wednesday had to be rescued by jetski after a huge bushfire swept through their coastal town in Western Australia.

WA's Department of Environment and Conservation (DEC) confirmed late on Thursday afternoon (WST) that the stranded residents, from the coastal town of Prevelly, had been ferried by jetski from their local beach to a waiting search and rescue craft offshore.

From there, they were taken to nearby Gracetown, just up the coast, from where they were bussed to an emergency welfare centre in the main rallying town of Margaret River.

A DEC spokesman said the sea rescue effort was successful, with no one injured.

More than 200 Prevelly residents had been forced to flee to their local beach after the fire raged out of control from the nearby Leeuwin-Naturaliste National Park, about 280km south of Perth, on Wednesday morning (WST).

One of the stranded residents, Surfpoint Backpacker's Hostel manager Will Carter, said the 55 who were rescued on Thursday afternoon had elected to stay, after others were evacuated from the beach by police on Wednesday night.

"What happened last night was everyone was forcefully evacuated by the police at about 7pm (WST)," Mr Carter said.

"And those that didn't leave due to the forceful evacuation had to be evacuated today from the beach by jetski - which is a pretty funky way to travel if you're going to do it."

Mr Carter said he was now in Margaret River, where the situation was worsening.

"They've just evacuated the local hospital, so it's getting worse," he said.

"I don't know when we'll be able to return home to Prevelly to see what's left."

The DEC has confirmed more than 20 homes and 2000 hectares of bushland have been razed in the area.

It has been a day of bushfires in WA, with two more fires near Denmark, 415km southeast of Perth and about 230km southeast of Margaret River, still raging and now threatening homes and lives in the area.

There have been unconfirmed reports of at least one person injured, while the DEC has warned Denmark residents to prepare to flee their homes.

At 5.30pm on Thursday (WST), one fire was 19km northeast of the township and had burned about 4000 hectares of bushland, while another was raging about 20km to the northwest, near Somerset Hill.

A bushfire 30km southwest of Nannup - about 60km east of Margaret River - is also burning out of control, with a possible threat to homes and lives in the area, according to the Fire and Emergency Services Authority (FESA).

Meanwhile, a hill fire in Gosnells, in Perth's southeast, is under control after firefighters battled it for most of the afternoon.

No one was injured and there was no damage to homes, though some roads remain closed.

Yet another fire was reported earlier on Thursday in the northeastern part of Mariginiup, Wanneroo, in Perth's northeast.

So far there is no threat to lives or property.

Thursday's bushfires were sparked as temperatures across the state remained high and strong winds fanned the flames.

They also came as FESA warned WA was facing one of its most dangerous bushfire seasons in recent history.

Four years of drought, followed by unusually high winter rains, had caused a build-up dead timber, grass and flammable bushland.

"There's a lot of fuel out there and the more fuel we have, the more intense the fires will be," FESA spokesman Allen Gale told AAP on Wednesday.