The best time to go to Manus Island is during the dry season, which runs from May to November.
During these months, you'll experience more sunshine and less rainfall, making it ideal for outdoor activities and exploring the island's natural beauty. The seas are generally calmer, which is superb for diving, snorkelling, and boat trips to the surrounding islets. This period offers the most comfortable conditions for enjoying all the island has to offer.
For those interested in marine life, the dry season often coincides with better visibility for diving and snorkelling, as well as opportunities to spot various species.