Russh,
No where to hire gear - in fact closest windsurfing shop is 600k away (Caloundra).
Generally July is not very good for wind - FirieBob has it all in Cairns. Last year there wasn't a breath of wind for around 10weeks over June July and early August. That said if you don't bring your gear then chances are it will blow. Bring your gear and it won't.
So if possible don't bring your gear and it'll blow for me.

Actually if it blew (highly unlikely) I could probably loan you a boom, wave sail (Ezzy waves SE 5.0, 5.8, & 7.0) and scrounge around for mast. Board could be a little more difficult although my brother hasn't used his JP 95l freewave for some time.