Apart from Tasmania the whole of Australia has the potential to be very hot during their summer and fires are a risk. Even though they’re in the south, SA and Victoria can be extremely hot - in fact temperatures in north NSW and southern Queensland are often lower but the humidity can be hell.
WA is mostly desert - can be 50 degrees ( I lasted 1 week as a bricklayer in Perth during January  )
NZ is a better option.
Hope you sort a trip out - keep us posted
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