Raja Ampat sits almost exactly on the equator, so it is warm and humid throughout the year. There is no cold season, only a shift between drier and wetter months that shapes the seas and the diving.
A warm, equatorial climate
Expect daytime temperatures of around 31 °C (about 88 °F) and nights near 25 °C, with roughly twelve hours of daylight every day of the year. The sea is gloriously warm, generally between 27 and 30 °C, which is why divers and snorkellers can stay in the water for hours. Brief, localised rain showers can happen in any season, then pass quickly.
The dry season — October to April
The most popular time to visit is the drier season, from roughly October to April. Seas tend to be calmest, underwater visibility is often excellent (frequently over 30 metres), and marine life is at its most active. The window from December to February is often considered the peak, with calm water and the best chances of encounters.
This is also manta ray season, which runs roughly from October to March and peaks between December and February, when reef mantas gather at cleaning stations in the central islands.
The wet season — May to September
The wetter months, around May to September, bring more rain and choppier seas, with June and July historically the wettest. It is not a bad time to visit, though: the water stays warm, the reefs are just as healthy, and there are far fewer visitors. Some remote sites and crossings can be affected by wind, so flexibility helps.
When to go, at a glance
| Dry season (Oct–Apr) | Calmest seas, best visibility, manta season — peak Dec–Feb |
|---|---|
| Wet season (May–Sep) | More rain, choppier water, fewer visitors — wettest in Jun–Jul |
| Air temperature | Around 31 °C by day, 25 °C at night, all year |
| Sea temperature | Roughly 27–30 °C year-round |
Conditions vary from year to year. Check recent local advice and with your accommodation when planning specific dates.
What to pack
- Lightweight, breathable clothing, plus a hat and sunglasses.
- A compact rain jacket or poncho — useful in any season.
- Reef-safe sunscreen, to protect both your skin and the corals.
- A rashguard for swimming and snorkelling (less sunscreen, more protection).
- A dry bag or waterproof case for boat transfers and showers.
- A reusable water bottle, insect repellent, and any personal medicines (see health).
Plan around the season
Your chosen season shapes the diving and the crossings. Pair this with our things to do and getting there pages to time your trip well.