Hundreds of firefighters in South Australia are struggling to contain a bushfire.

The fire has already destroyed around 30 homes with many more under threat. ABC is currently reporting that 37 families are currently in temporary accommodation.

More than 27,000 acres of scrub and farmland have been ablaze in the Mount Lofty Ranges, east of Adelaide, since the weekend.

South Australian Premier Jay Weatherill commented: "There are number of flare-ups across the fire ground."

"Trees continue to burn and may fall. Fires from flare-ups can burn rapidly and be erratic, so be aware of fire danger in your area on an ongoing basis."

Meanwhile, the Country Fire Service (CFS) warned that flare-ups could continue for the next few weeks.