Extreme temperatures, damaging winds and severe thunderstorms are expected to grip much of South Australia on Monday, prompting a "severe to extreme" fire rating for most of the state.

Key points: Temperatures are tipped to reach the mid-40s in northern parts of SA on Monday

Temperatures are tipped to reach the mid-40s in northern parts of SA on Monday Total fire bans with "severe to extreme" ratings are in place for most districts

Total fire bans with "severe to extreme" ratings are in place for most districts The BOM has warned of damaging winds and potential severe thunderstorms

The conditions have prompted the Country Fire Service (CFS) to warn those in bushfire-prone areas to remain vigilant and make decisions early about staying or leaving their property.

It comes as the CFS continues to battle blazes at Cudlee Creek, in the Adelaide Hills and at Duncan, on Kangaroo Island, which both remain at advice level.

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A bushfire was also still burning at Bunbury, 40 kilometres west of Keith, in the state's south-east, which was lifted to a watch and act level on Sunday morning.

The fire had since been downgraded to an advice level.

The CFS on Sunday provided updated numbers on the impact from the bushfires burning across the state.

Since the start of the fire season in October, it is estimated more than 400 structures have been destroyed, which includes 98 houses, and more than 63,000 hectares of land has been burned.

A catastrophic fire danger rating has been flagged for Adelaide, Mid North and the Yorke Peninsula, while extreme danger is predicted at Murraylands and the Lower South-East districts.

A severe fire danger rating is also in place for the rest of the state, which includes the Adelaide Metropolitan, Flinders, Riverland, Kangaroo Island, the West Coast, Lower and Eastern Eyre Peninsulas and the Upper South East.

At this stage, total fire bans are in place for all districts other than the North East and North West Pastoral on Monday.

The threat level from the devastating Cudlee Creek fire in the Adelaide Hills has been downgraded. Earlier this week, the Country Fire Service warned residents to stay alert.

"Any localised winds, along with the forecast weather will increase the chances of fire outbreaks. Everyone needs to remain vigilant," the CFS said.

In good news for volunteer firefighters, Emergency Services Minister Corey Wingard said those who battled blazes in Cudlee Creek and Kangaroo Island last week will have the same arrangement as NSW firefighters in regards to compensation.

Prime Minster Scott Morrison earlier announced volunteer firefighters in NSW can apply for conditional payments of up to $6,000 from the Federal Government to cover income lost while fighting the fires.

Weather to bring 'elevated fire conditions'

Bureau of Meteorology (BOM) forecaster Bonnie Haselgrove said very hot conditions were expected on Monday with very hot and dry north to north-westerly winds.

Eden Hills CFS crews working with locals during the Cudlee Creek blaze. ( Facebook: Eden Hills CFS )

She said gusty winds and possible thunderstorms would increase the danger in bushfire-prone areas.

"We're looking at elevated fire conditions right across South Australia," she said.

"At this stage, most districts will be in severe to extreme, and they may be upgraded."

Temperatures in the mid-40s are expected in most of the north of the state while Adelaide is tipped to reach 40 degrees Celsius.

Regional areas likely to be the hottest include Oodnadatta, which is tipped to peak at 46C with a possible storm.

CFS crews take a rest amid the Cudlee Creek bushfire in the Adelaide Hills. ( ABC News: Catherine Zengerer )

Coober Pedy is tipped to reach 45C, as is Roxby Downs, Tarcoola and Woomera.

Port Pirie and Port Augusta, in the mid north of the state, are also tipped to reach 45C.

'Some relief' expected in the evening

Ms Haselgrove said regions such as the Riverland would also remain in the mid-40s for most of the day.

"Being further east, it takes a little bit longer for that cool change to get through so we're seeing warmer conditions in the eastern and north-eastern parts of the state," she said.

Renmark, in the Riverland, is tipped to reach the mid-40s on Monday. ( ABC Riverland: Laura Collins )

She said most of the state was expected to get some relief from the heat later in the afternoon when a cool change was tipped to hit the state.

"[It's] probably going to be pretty gusty ahead of a change moving through during the day, [for] most locations that's probably going to be moving through in the afternoon," she said.

"We will see fresh south-westerly winds following that, much cooler conditions in the evening tomorrow for most locations."

However, the far north-east of the state may not see that cool change, which is expected to peter out as it moves further east.

"In fact, Moomba is looking like it will stay at 40C for the next week, so very hot conditions persisting in the inland, eastern parts of Australia," she said.

Outside of South Australia, Swan Hill in Victoria is expected to reach 43C on Monday, and Menindee in New South Wales is also forecast for 43C.

As for metropolitan areas, Parramatta in Western Sydney is expected to reach 38C on Monday; Melbourne is forecast to reach 43C; and the northern Adelaide suburb of Elizabeth could reach 41C.

Canberra is expected to hit 39C on Monday and Tasmanians will not be spared from the heat either with Hobart predicted to hit 40C.