Catastrophic bushfire conditions in three South Australian districts will have firefighters on alert as the state swelters amid high heat and rising winds.

The temperature is forecast to reach 40C in Adelaide on Monday, with some regional centres to get even hotter.

But it’s a cool change in the afternoon that is causing the most concern, with strong and shifting winds set to heighten the risk of bushfires spreading.

The Country Fire Service is particularly worried about the potential for breakouts from the Adelaide Hills fire, and from a blaze on Kangaroo Island that continues to smoulder.

The Adelaide Hills fire has already burnt through 25,000 hectares and destroyed more than 80 homes since it was sparked amid similar conditions 10 days ago.

CFS chief officer Mark Jones said it was regrettable that the same conditions had returned so soon.

“The potential for hot-spot breakouts tomorrow is incredible across the whole fire zone,” he said.

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The catastrophic conditions will stretch across the Adelaide Hills, through the mid-north and across to Yorke Peninsula.

Other areas of the state will have either extreme or severe warnings in place.

AAP