We've been coming to Coz for 12 years but always in February or March. We were just there at the end of February for Carnival. But this will be our first trip in the summer, going July 20 thru July 27th.

Should we expect anything different in July besides warmer temps?

It will be a lot hotter and much more humid.

We always go in the summer now but used to go in April. It's hotter and more kids around. That's about the only difference I have noticed.

ditto what Zman said above.  Also, you will have longer hours of daylight coming in the summer so  night dives start a good deal later in the summer!