The Country Fire Service (CFS) battled more than 45 fires across South Australia on Wednesday in catastrophic conditions and record November heat, with reports of at least one home lost on the lower Yorke Peninsula.

Key points: Several of the fires reached emergency level, including at Yorketown

Several of the fires reached emergency level, including at Yorketown The state has recorded high temperatures and strong winds

The state has recorded high temperatures and strong winds At least one house has been destroyed on the Yorke Peninsula

An emergency warning has been issued for a fire burning out of control towards Edithburgh on the Lower Eyre Peninsula.

The CFS said the fire at Stansbury Road in Yorketown is uncontrolled and may pose a threat to people directly in its path.

It is burning in an easterly direction towards the Edithburgh township but the CFS said conditions are continually changing.

The fire had been downgraded to a 'watch and act' warning overnight but has since flared up and been escalated to a warning message.

Several other fires on Wednesday reached emergency warning levels — including near Angaston in the Barossa Valley and near Port Wakefield — before being downgraded as a result of firefighting efforts.

A team was on the way to Yorke Peninsula to assess losses from the Yorketown fire which, according to an incident controller, has blackened about 4,000 hectares.

Yorke Peninsula Mayor Darren Braund said at least one house had already been lost in the fire, adding he had spoken to the owner of the property.

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"Some have lost some equipment, and at least one house has gone that I'm aware of," he said.

"I was able to have a chat with a guy who owned that. There was one farmhouse that I know for sure has gone.

"Before we could see big plumes of smoke, but now the sky is fairly covered [in dust and smoke]."

CFS Duty Commander Sam Quigley said firefighters had also received unconfirmed reports of property losses.

"We have a rapid damage assessment team travelling to the Yorke Peninsula," he said.

"They'll be undertaking those assessments throughout the night tonight. That's made up of the South Australian Metropolitan Fire Service, so specialists in that field, so hopefully during the night we'll be able to provide updates."

The CFS earlier said the stubble fire was burning in a westerly direction toward Port Moorowie and in an easterly direction towards Wattle Point, but conditions were continually changing.

Thousands of homes still without power

Temperatures soared across South Australia, with more than a dozen locations recording November temperature records.

Strong winds also led to catastrophic conditions being declared in several regions including the Mid North, Kangaroo Island and the Mount Lofty Ranges.

CFS spokeswoman Ali Martin earlier said resources had been directed to protect properties near Yorketown.

"There are assets under threat, either homes or sheds under threat, so our firebombing and ground resources are working to save those," she said.

CFS firefighters relax at the Yorketown Oval after fighting the fire near Yorketown. ( ABC News: Gary-Jon Lysaght )

More than 6,000 properties across the state remain without power — including almost 600 customers on the Yorke Peninsula.

Paul Roberts from SA Power Networks said it could take considerable time before crews could get back into the area.

Price Caravan Park owner Erica Carter is nervous about what she will come back to. ( ABC News: Gary-Jon Lysaght )

"We're going to be looking at an extended outage really, we are not out of the catastrophic conditions yet," he said.

"We're not going to be able to restore supply until the conditions ease and until we can confirm the safety to do so."

Earlier, a fire at Price on the upper Yorke Peninsula was downgraded to "watch and act" level after two earlier emergency warnings.

Price Caravan Park owner Erica Carter was unable to return to the town because of the fire.

She said one family in the park had decided not to leave, while most had gone to the pub.

"Not being able to check how everybody is, it's hard to sit here and wait and not know who's helping who and who's doing what," she said.

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Watch Duration: 58 seconds 58 s Firefighters tackle blazes north of Adelaide. ( ABC News )

The Appila crop fire in the Mid North was downgraded to an "advice" level after previously heading towards Caltowie and Jamestown.

The fire at Port Wakefield Highway near Port Wakefield has also been downgraded to an "advice" status.

The highway has reopened after being closed for several hours.

The fire on the Stott Highway at Angaston, in the Barossa Valley, has been downgraded to "watch and act" after it was sparked in a manure pile at a horse stud.

Dozens of fires across the state

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Watch Duration: 50 seconds 50 s CFS firefighters have been praised for minimising fire damage in catastrophic conditions.

The CFS says it responded to at least 45 fires across South Australia on Wednesday.

CFS acting deputy chief Rob Sandford praised volunteer firefighters for an "amazing" effort.

"We've seen some 45 different fires across the state that the CFS has responded to," he said.

"A number of those fires were of concern to us, but the crews have done an outstanding job in very trying conditions.

"They are the worst conditions that our people could be operating in, and the worst conditions when a fire gets going."

Firefighters at the fire on the Stott Highway near Angaston. ( ABC News: Brittany Evins )

Earlier, the CFS warned people in extreme and catastrophic fire danger areas to enact their bushfire survival plans, after a total fire ban was in place across the state on Wednesday.

SA Power Networks turned off power to Port Lincoln and the lower Eyre Peninsula due to the catastrophic conditions during the day.

Last week the network was disconnected in Port Lincoln during a bushfire at Duck Ponds which threatened the town.

Record temperatures set across state

Records have been set for top November temperatures in spots including Hindmarsh Island, Parndana, Murray Bridge, Kingscote, Stenhouse Bay, Robe, Parafield Airport, Keith, Padthaway South, Clare, Strathalbyn, Lameroo and Naracoorte.

Adelaide reached 41.6C at 4:21pm, below the West Terrace weather station record of 42.7C, set in 1962.

Bureau of Meteorology forecaster Mark Anolak said a cool change was now sweeping slowly through South Australia, but parts of the state would not get relief until after sunrise.

The change is expected to reach Adelaide about 5:00am.

"It will be oppressive for those trying to sleep tonight in Adelaide particularly," Mr Anolak said.

"[We'll] probably have a temperature around 27C or 28C for most of the night in Adelaide."