Nothing particularly wrong with August Heg, here's our opinion: You can go liveaboard diving in Komodo all year round. The liveaboards here do not close for an off-season because every month of the year promises top quality action. Some consider April to November to be the best time to visit as the weather is best then and November to March is rainy season. April, just after rainy season, is often considered the best month.
Normally the water is cooler (average 20 to 25°C) in the south and warmer and clearer in the north (average 25 to 28°C), but this can change. The absolute best time for good visibility in Komodo is from November to January when 30+m is common. July and August, having cooler seas and being more nutrient-rich, have lower visibility but have blooming marine life.
January to March can have rough surface conditions at the northern Komodo dive sites. July and August can have rough seas in the south and Rinca. But these conditions rarely interfere with the liveaboard schedules to any great extent.
As far as seasonal patterns for big marine life go, the best time for manta sightings is December to February (though they are seen all year round), and for Mola Mola the best month is generally August.
We want to book fairly soon, but given the costs involved, we dont want to go at the wrong time of year.
