While Tadji itself is a small locality, for visitors to the wider Sandaun Province, the best time to visit is during the dry season, which typically runs from May to October.
During these months, you'll generally find more sunshine and less rainfall, making it more comfortable for exploring the natural beauty and cultural experiences the region has to offer. The dry season also means better conditions for outdoor activities like hiking and visiting coastal areas.
Couples looking for a relaxing escape will find the drier weather more conducive to enjoying the pristine beaches and the relatively calm seas for swimming or snorkelling. The clearer skies also offer better opportunities for stargazing in the evenings.