A forecast wind change is expected to push a bushfire burning north of Adelaide back onto itself.
The blaze at Bundaleer North has been burning since Wednesday afternoon and has already destroyed about 2300 hectares of forest and scrub.
There were concerns on Thursday afternoon that a wind change would push the fire towards farming communities but Country Fire Service spokesman Chris Metevelis said there were no longer any concerns for the safety of nearby communities by Thursday night.
He said a south easterly wind change expected at midnight (CDT) would push the fire away from the communities and back onto itself.
Mr Metevelis said 200 firefighters were battling the blaze which is burning in hilly terrain, inaccessible to vehicles.
He said the use of aircraft to help fight the blaze would resume on Friday morning.
The blaze has closed a number of roads in the mid-north while smoke has extended beyond the Clare and Gilbert Valley region, reaching towns further south including Port Wakefield and Mallala.
The fire came as most of South Australia endured extremely hot conditions, with Adelaide posting a top temperature of 43C while the mercury hit 46.4C at Port Augusta.
A cool change was expected across the state on Thursday night with Adelaide's forecast top for Friday a more comfortable 27C.