September and October are probably the 2 best months for diving. Water temp should be 70-72 degrees, so base your exposure protection accordingly. If I were you, I would do a combination of shore diving at Casino Point and some boat diving. Both are great.I'm heading to Avalon in mid-September. Never been to Catalina before. What are the conditions like at that time of year? Water temp, visibility, etc.? I'm wondering which wetsuit I should bring. Is mid-September still peak diving season, or will the crowds have thinned out by then? I'll be there for a few days, so I'm hoping to do the dive park and boat dives. Which is better? I'll be bringing all my own gear, except tanks and weights. I welcome any tips/advice on how to make diving in Catalina easy and enjoyable. Thanks!
You can check with http://www.catalinadiverssupply.com/ for info on boat diving.