The Bureau of Meteorology issues a severe heatwave warning from Geraldton to Augusta, with temperatures eight to 12 degrees Celsius above normal.
Residents are urged to stay hydrated and check on vulnerable individuals as extreme fire danger is forecast.
The stormy week promises relief for drought-affected areas in Queensland, New South Wales, and parts of Western Australia.
While the storms bring much-needed moisture, Mr Narramore cautions that it may not fully reverse the damage caused by several months of severe drought in some areas.
Rainfall is expected to be patchy but significant, with the potential for over 100 millimetres in storm-hit regions.
Subscribe to The Briefing, Australia’s fastest-growing news podcast on Listnr today. The Briefing serves up the latest news headlines and a deep dive into a topic affecting you. All in under 20 minutes.