Hi There,
I think one of the best place can be Maldives for diving . You can expect to see colourful small fishes and big fish skools. Sharks, whale shark , manta rays and turtle etc .. to name a few . while the reef can be like coral garden with lot of colours. Visibility is good for 30 meters at this time period even.
August you can expect some shower rain in Maldives and choppy sea, however its worth while for the diving.
we do have a tour operating from 16th to 23rd August. If intrested drop me a line.
www.maldivesdiivingadventure.com