Around the coastline of Oz can be quite humid, but much more so on the east side (Queensland-N.S.W.) than the west......or so I'm told. The further north one goes, the higher the humidity. I live three-four hours inland from the N.S.W. coast where the humidity is much lower, so I keep a close eye on my guitars and ukes.

Lived in the Big Smoke (Sydney) where the humidity is fearsome, for 40 years. Occasionally we make a foray to the coast and my hair can always tell.