i lived in airlie beach for 2 years and used a baby rock 100% cotton sling (not a front pouch) and it was fine. However if i still lived there i would get their mesh ones. that would provide ventilation in the heat.

They are adjustable and DH used it too. very easy to change the size with 1 hand. whilst bub is in the sling too.

The gold coast you prob wont get that many 'over the top hot days' so you will be ok with what ever sling as long as you look for a breathable material.

hth