Three people died and 200 homes and sheds were lost to bushfires over the weekend in NSW and QLD, but experts have warned the worst may still be yet to come.

Firefighters are continuing to battle blazes in both states, as residents in parts of Western Australia are on high alert with an "Extreme Fire Danger" forecast for the South Interior.

The NSW Rural Fire Service is bracing for the highest level of bushfire danger for Greater Sydney and the Greater Hunter, including the Blue Mountains and Central Coast areas.

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For those areas with a "Catastrophic" rating, the NSW RFS recommends that "leaving early is the only option".

"Leave bushfire prone areas the night before or early in the day – do not just wait and see what happens," the RFS site says. "Homes are not designed to withstand fires in catastrophic conditions so you should leave early."

All three people who died in unprecedented bushfires in NSW have been identified while all those feared missing have been accounted for.

Julie Fletcher, 63, was named by media outlets yesterday as the third victim of the bushfires. Her body was discovered in a burnt-out home in the town of Johns River some 40km north of Taree on the mid-north coast.

Fires swept through the area on Saturday afternoon.

Fletcher's neighbour Russell Souter said she was a "quality person". "(She) would help you any time, her father was the same, they're just a really good family," Souter told the ABC on Sunday.

Fletcher's sister told Souter she was "just devastated". "What do you when you lose a family member?" he said.

It has been reported the second victim of Friday's firestorm, who was found in a burnt car near Glen Innes, is George Nole. Those who knew Nole, an elderly man from Wytaliba, took to Facebook to pay tribute to him.

"He was such a gentlemen. Will be missed by many," Crystal Grob posted.

Wytaliba resident Vivian Chaplain, 69, was earlier named as one of the victims. Chaplain was treated for burns before being transferred to a Sydney hospital where she later died, the Rural Fire Service NSW said on Saturday. Friends have posted emotional tributes on social media.

"I am so sorry for your loss ... Vivian was such a beautiful person," Laura Hayden wrote on Facebook.

"Many condolences to all at Wytaliba, each and everyone is in our hearts," wrote Nola Mae.

On Saturday, seven people were reported missing but on Sunday the NSW RFS confirmed all had been accounted for.

NSW Premier Gladys Berejiklian says her thoughts are with all those affected by the fires.

"The situation is very serious," she said in a statement.

"Our thoughts and prayers go to the families and loved ones of those who have died and to all who have been affected by these fires."

Qld warning for Monday and Tuesday

In Queensland, Premier Annastacia Palaszczuk warned on Saturday, "We are not out of the woods yet because there is going to be constant fire danger over the next week, right up until Friday, with Wednesday being a very serious day".

A light, humid sea breeze should assist firefighting efforts in coastal areas today, the Bureau of Meteorology's Dean Narramore said.

"It will hopefully allow firefighters to get a bit of a handle on the fires," he said.

But later in the day, a fresh gustier sea breeze could challenge firefighters in the Yeppoon area.

A state of fire emergency across 42 local government areas bans all outdoor fires and activities such as welding that can spark fires.