I hate to be the bearer of bad news but you absolutely do not need to bring it to Australia at the moment "just in case" it gets cold.
I was in Sydney up until the start of the week, and am now in Melbourne. It really is not leather jacket weather in either city.
It's a nice looking jacket, even if unsuited to the local climate.
Hey @ProteinNerd, aren't you a size 42 in a Café Racer? Though I don't think that you'd want to get into a fight with @Plumbline for it.