Diving on Lembeh is available all year long. January to June diving conditions may vary, but mostly they are fine. August sees the poorest visibility but the richest number of sea creatures patrolling the waters. September to October are probably the best months for diving. The water temperatures at Lembeh Strait range between 25-27C/82-88F, the air temperature in North Sulawesi stays around 29-32C/95-104F all year-round.
What to see
Muck diving is all about spotting tiny underwater critters, to be on the lookout for numerous weird but amazing looking species such as the Lion Fish, Giant Frog Fish, Hairy Frog Fish, Mimic Octopus, Blue Ringed Octopus, Banded Sea Snake, Banded Eel, Mandarin Fish, Orangutan Crabs, Manta Shrimps and many other species. Larger pelagics are usually found elsewhere. Sometimes, however, divers may run into a whale shark or a dugong who come to feast on smaller life forms.