Authorities warn an extreme heatwave coming to South Australia will be a risk to public safety.
Nurses will increase their checks on vulnerable people in the community as temperatures reach 43C in Adelaide on Wednesday and Thursday.
The mercury could climb higher in inland areas.
"Apart from the extreme coastal locations, you really could get a 45C-type maximum anywhere," Bureau of Meteorology senior forecaster Tom Boeck told AAP.
The State Emergency Service issued an extreme heat warning on Sunday and says hot weather conditions from Monday to Friday might be a risk to public safety.
Premier Jay Weatherill said people needed to revisit bushfire action plans and be prepared for an emergency.
"With several days forecast to be over 40 degrees, fire danger will be incredibly high, so it's important people have plans in place to deal with an emergency," he said.
Fire authorities will be on high alert, and police are expected to instigate Operation Nomad patrols, which check on known firebugs.