Hi Mike, July is right in the middle of our season.
The coast is gusty and water rough, if it's overcast it kills the wind, last year was crap but this year is starting to look good. A dry year is a good year.
Green Island is nearly always blowing, but costs about $50 to get there.
Just realised your talking a weekend & small sails, just go to Green, Cairns (Yorkey's) is a gamble

If I'm in town and not working, I'll go to Green with you if you want &/or help you out the best I can, let me know. Just don't wear those shorts !
I believe fitz66 has been to Green a few times.
Give me a yell when you're ready.