The best time to go to Hakaui is during the dry season, which runs from May to October.
During these months, you'll experience less rainfall, lower humidity, and more sunshine, making it ideal for exploring the island's natural beauty. This period is superb for outdoor activities such as hiking to the Hakaui Waterfall, which is one of the tallest in French Polynesia, or enjoying boat trips along the coast. The drier conditions ensure that trails are more accessible and views are clearer, which is particularly beneficial for those looking to photograph the dramatic landscapes.
For travellers interested in cultural events, the Marquesas Arts Festival, a significant cultural celebration, takes place every four years in December, alternating between different islands. If your visit aligns with this, it offers a unique opportunity to witness traditional Marquesan dance, music, and crafts, though it falls outside the main dry season. While the weather might be wetter, the cultural experience is unparalleled.
Ultimately, for comfortable exploration of Hakaui's stunning natural environment, the dry season from May to October is your best bet.