A 14-year-old Scottish boy has died in searing heat in the harsh Australian Outback while hiking with his father, police said.

Ewan Williamson, who arrived in Australia in mid-December, collapsed four hours into the walk in the Cape Range National Park on Friday with little water or shade as temperatures soared above 40 degrees Celsius (104 Fahrenheit).

In naming the boy who died in hospital, police said late Sunday that his father alerted authorities who located the pair 20 kilometres (12 miles) south of Exmouth in Western Australia.

The cause of death is yet to be determined but reports said he was severely dehydrated.

It was the second death in six weeks in Australia's harsh interior after a 25-year-old man died of thirst in remote southeast Queensland state last month, prompting police warnings about the risks of the desert.