Total fire bans are in force across all of South Australia, which is braced for a heatwave, lightning strikes and strong winds.
For the first time in more than a year, the bans cover all 15 districts including the Adelaide metropolitan area.
AAP reports a top temperature of 40 degrees for the state capital on Thursday, giving the city its seventh consecutive day above 30 degrees. Other parts of the state are expected to reach the mid-40s.
Lightning strikes are predicted later in the day and SA Power Networks has warned residents to be prepared for their electricity to be turned off it as conditions worsen.
A cool change is expected to sweep through Adelaide on Friday, dropping the maximum temperature to 31 before falling into the mid-20s over the weekend.