The Country Fire Service says it’s concerned about the bushfire risk across South Australia.

A string of bushfires continue to burn in South Australia as the state braces for two days of intense risk.

Temperatures across SA will push into the mid 40s with the Country Fire Service (CFS) increasingly concerned by forecasts of rising winds.

“We’re going into an escalating pattern with increased winds over the next couple of days and fire safety is absolutely critical,” CFS chief Greg Nettleton said on Wednesday.

“The ground is already pre-heated, the grass, the bush and everything is dry and the weather will be hot and dry.”

As the danger rises, five fighting aircraft are being deployed to South Australia from NSW, Queensland and Victoria to bolster local resources.

The CFS has also engaged fire modelling experts to predict where existing and new fires might run and what resources need to be deployed.

On Wednesday crews continued to battle fires in the Adelaide Hills, the mid north, the southeast and across Eyre Peninsula.

Those causing the most concern were at Delamere, south of Adelaide, at Ngarkat in the southeast, at Kiana on Eyre Peninsula and at Rockleigh, east of Adelaide.

The Rockleigh fire, which destroyed one house on Tuesday, was contained within control lines but continued to burn freely.

An approaching wind change had raised concerns the blaze could break free on its west and northern flanks.

The CFS said the blaze at Delamere continued to burn out of control in steep terrain.

Some properties at Cape Hill, Wattle Hill, Salt Cliffs and Starfish were at risk with people living in the area urged to activate their bushfire plans.

The fire at Ngarkat was also reported to be burning out of control in scrub while the Kiana blaze was not a threat to people or property and was being monitored.

On Tuesday CFS crews were called to more than 300 fires across SA with most quickly contained after being started by lightning strikes.

At one stage fires were being reported at the rate of one or two every minute while the CFS website took 20 million hits during the day.