"You'd think that if the world was getting hotter, and Australia being an island/continent, you'd think it should be getting more humid"

Another proof of your ignorant foolishness.

It's called "El Nino" -
Google is your friend - and has been incorporated in the full Climate Change Theory. As we Aussies are seriously impacted by it (unlike Yanks!), we learn about it... (unlike Yanks)...