Went twice in the same time frame that you are cruising.... once at CC, it was overcast and drizzling, needless to say, I did not snorkel. (Too cold for me). Another time it was at least sunny, air temp 75ish, water temp was a little too cool for me..... I went snorkeling anayways..... I ended up exiting the water shivering after about 15 minutes. I couldn't get acclamated to the water...... So, I just sat on a beach chair and enjoyed the atmosphere after the fact. Enjoy your vacation!