Im a bloody guru, I'll tell ya

The wind/weather sucks in North Queensland.
What to take-
Umbrella and stinger suit.
Maybe pack massive kites and light wind boards if you like paying excess baggage.
10m for the windy days. That is about 2-6 days in August.
13m-16m for the not so windy days. 10 days/month between showers.
Leave your surfboard at home. Alva waves are far over rated.