When to Dive Raja Ampat: Month-by-Month Guide

Raja Ampat is the most biodiverse water on earth. It is also genuinely seasonal in a way that Red Sea and Maldives aren't, and getting the month wrong means paying top price for a trip where half the best sites are closed to weather.

This guide walks through the year for divers planning 2026 trips, with specific focus on manta season at Dampier Strait, Misool (southern Raja) itinerary windows, and the weather-driven gaps most operator pages gloss over.

The short answer

Overall best month: February — peak manta season, calm weather, full operator availability.

Secondary best: November or early December — similar conditions, slightly lower crowds, mantas arriving.

Manta peak at Dampier Strait: December–March.

When not to go: June–September — wet/windy season. Many liveaboards drydock or reroute.

Best value: early April — tail end of season, prices softening, conditions still strong.

The geography that drives the decision

Raja Ampat sits in the eastern Indonesian archipelago at the northwestern tip of West Papua. The diving divides into two main zones:

• North/Central (Dampier Strait, Fam, Waigeo): manta-ray concentrated, big current diving, most boats based from Waisai.
• South (Misool): reef-structure diving, fewer divers, different seasonal window.

The monsoon hits these zones differently. North Raja is more weather-sheltered; Misool is exposed to stronger swell in the off-season.

Month by month

January

• Water temp: 28–30°C
• Air temp: 26–32°C, humid
• Rain: daily afternoon showers common
• Viz: 20–30m
• Key species: mantas (Dampier Strait peak building), sharks, schooling jacks
• Crowds: high (peak season)
• Prices: peak

Proper dive season in full swing. Most operators running full schedules. Manta action strong.

February

• Water temp: 28–30°C
• Air temp: 26–32°C
• Rain: regular
• Viz: 20–30m
• Key species: mantas (peak), sharks
• Crowds: peak
• Prices: peak

The month most serious divers target. Manta aggregations at their most reliable. Book 9–12 months ahead.

March

• Water temp: 29°C
• Air temp: 27–32°C
• Rain: regular
• Viz: 20–30m
• Key species: mantas tapering, reef action strong
• Crowds: high
• Prices: high

Last of the peak manta weeks. Reef diving continues at its best. A reliable excellent month.

April

• Water temp: 29°C
• Air temp: 27–32°C
• Rain: variable
• Viz: 15–30m
• Key species: transition
• Crowds: mid
• Prices: softening

Transition month. Manta action tapering noticeably. Weather starting to shift. Early April still reliable; late April mixed.

May

• Water temp: 29°C
• Air temp: 26–31°C
• Rain: variable
• Viz: variable
• Key species: reef life, residual pelagics
• Crowds: low
• Prices: shoulder

Season end. Some operators running final trips. Winds picking up. Viable if you accept unpredictability.

June

• Water temp: 28–29°C
• Air temp: 26–30°C
• Rain: heavy
• Viz: reduced
• Key species: reef
• Crowds: low
• Prices: off-peak

Official off-season starts. Most premium liveaboards drydock or reroute to other destinations. Some land-based diving continues but with weather limitations.

July

• Water temp: 28°C
• Air temp: 25–30°C
• Rain: heavy
• Viz: reduced
• Key species: reef
• Crowds: very low
• Prices: lowest, if available

Deep off-season. Do not book a Raja Ampat trip for July unless you have strong local advice suggesting a specific weather window. Most operators simply aren't running.

August

• Water temp: 28°C
• Air temp: 25–30°C
• Rain: heavy
• Viz: reduced
• Key species: reef
• Crowds: very low
• Prices: lowest

Same as July. Not the window for Raja Ampat.

September

• Water temp: 28°C
• Air temp: 26–31°C
• Rain: tapering
• Viz: improving
• Key species: reef
• Crowds: low
• Prices: off-peak

Season starting to rebuild. Weather improving but still unpredictable. Early-return liveaboards start scheduling for October.

October

• Water temp: 28–29°C
• Air temp: 26–31°C
• Rain: variable
• Viz: improving (20m+)
• Key species: mantas arriving at Dampier
• Crowds: mid
• Prices: shoulder

Dive season returning. Manta activity building toward peak. Good value window for divers who don't need peak reliability.

November

• Water temp: 28–30°C
• Air temp: 26–32°C
• Rain: regular afternoon
• Viz: 20–30m
• Key species: mantas (ramping), reef strong
• Crowds: mid
• Prices: mid

Often overlooked. Conditions nearly peak-season quality but prices and crowds lag. Strong value month.

December

• Water temp: 28–30°C
• Air temp: 26–32°C
• Rain: regular
• Viz: 20–30m
• Key species: mantas strong, full reef action
• Crowds: peak (Christmas)
• Prices: peak (Christmas weeks)

Peak season officially. Christmas and New Year weeks premium-priced and booked 12+ months ahead.

Which itinerary when

• North Raja (Dampier Strait, Waigeo): October–April.
• Misool (south): November–March (southern reefs exposed outside this window).
• Combined north + south itineraries: December–March.

Most 10-night itineraries combine both zones in the peak window.

Key planning notes for 2026

• Book 9–12 months ahead for peak months. The best boats for the best weeks sell out early.
• Flights route via Jakarta or Bali to Sorong (SOQ). The domestic leg is often the most fragile part of the trip. Build a buffer day in.
• Marine park fees are charged on top of boat prices (~€100 per diver).

How we help

Tell us what you want to see and when you can travel. We'll match you to the right zone, the right operator, and the right cabin category for your budget.

Plan your Raja Ampat week →

• Manta Ray Encounter Calendar: Destinations by Month — Raja mantas in global context.
• Red Sea vs Maldives vs Raja Ampat: First-Liveaboard Decision Guide — How to choose between this and the alternatives.
• Liveaboard Prices 2026: What Your Budget Actually Gets You — Where Raja sits in the pricing tiers.