Doctors warn there are biological limits to temperatures we can survive, and exposure to extreme heat can provoke a heart attack

Temperatures are expected to peak on Tuesday, reaching the "high forties" in Victoria and South Australia.

Ouyen and Mildura in northern Victoria forecast to break state’s all-time maximum on Tuesday, as weather warnings issued

Doctors warn there are biological limits to temperatures we can survive, and exposure to extreme heat can provoke a heart attack