South Australians have been urged to start taking precautions as very hot conditions are forecast for most of the state for a week.
Temperatures will surge into the 40s early next week and are expected to remain there until Friday.
SA Ambulance Service operations team leader Bryan Ward says prolonged periods of heat can exacerbate pre-existing medical conditions.
''We encourage people to start taking precautions in preparation for the upcoming hot weather and to check on those who may be vulnerable to the heat, such as elderly family members, elderly neighbours and children,'' he said.
''We generally tend to notice an increase in workload at around day four to five of a heatwave.''
Mr Ward said extra ambulance crews would be deployed if necessary.
SA Health said tips to beat the heat included drinking plenty of water, avoiding alcohol and caffeine, wearing light, loose and comfortable closing as well as a hat and sunscreen, staying out of the sun during the hottest part of the day and avoiding outdoor exercise or strenuous physical activity.
It said precautions to take before the heat included stocking up on water and groceries to avoid constant trips to the shops, testing any fans or air-conditioners that may not have been used for some time and swapping phone numbers with a neighbour or friend with a view to keeping in contact during the hot spell.
The State Emergency Service said the hot weather could also bring a number of safety concerns including the risk of power cuts and trees dropping branches without warning.
The extreme conditions will also have fire authorities on high alert with police expected to instigate Operation Nomad patrols which check on known firebugs.