Riley Phinisi Editorial DeskIn short: Komodo’s sea state follows two monsoons. December to March brings westerly wind, rain squalls and choppier northern water; May to September brings dry southeast wind, calm northern anchorages and real swell on south-facing coasts. April and October to November are transition months, usually the flattest water of the year. Currents run hard all year on spring tides.
This page is a conditions reference, not a recommendation. If you already have dates in mind and you want to know what the water will actually do in that window, read the table below. If you are still choosing dates, the trip-planning logic sits in our guide to the best time to charter Riley instead.
The two systems that set Komodo’s sea state
Komodo National Park sits in the Flores Sea between Sumbawa and Flores, with the open Indian Ocean to the south. Two things drive conditions there, and they are largely independent of each other.
The first is the monsoon cycle. A northwest monsoon runs roughly December to March, bringing rain, humidity and wind onto the north and west-facing coasts. A southeast monsoon runs roughly May to September, bringing dry air, clear skies, stronger afternoon wind and Southern Ocean swell onto the south coasts of Komodo and Rinca. April and October to November sit between the two, with light and variable wind.
The second is tide. The straits between the islands funnel water between the Flores Sea and the Indian Ocean, and the resulting currents are strong every month of the year. They peak around new and full moon and slacken around the quarter moons. No month is a “calm current” month, which is why itinerary timing matters more than season for the dive and snorkel sites.
Komodo weather by month: sailing conditions table
Figures below describe typical patterns, not guarantees. Any given week can run against the average.
| Month | Prevailing wind | Rain | Central and north park sea state | South coast exposure |
|---|---|---|---|---|
| January | Northwest, moderate, gusty in squalls | Highest of the year; heavy afternoon and night showers | Short wind chop on north-facing anchorages; sheltered bays stay workable | Low: the south is in the lee of the wind |
| February | Northwest, similar to January | High; multi-day grey spells possible | Choppiest month for northern crossings | Low |
| March | Northwest easing late in the month | Falling; showers shorter and more isolated | Chop easing week by week | Low to moderate |
| April | Light and variable, monsoon transition | Occasional showers, mostly brief | Often the flattest water of the year | Low to moderate |
| May | Southeast establishing, light to moderate | Low | Calm mornings, light afternoon ripple | Building |
| June | Southeast, steady, often stronger after midday | Very low | Calm in the lee of the islands; wind chop on open stretches | Moderate to high |
| July | Southeast, strongest of the year, dry and cool | Minimal | Calm sheltered anchorages, brisk afternoon crossings | High: peak southern swell |
| August | Southeast, still strong | Minimal | As July; wind typically drops overnight | High |
| September | Southeast easing through the month | Low | Settling; afternoons less breezy than August | Moderate, easing |
| October | Light and variable, second transition | Low, first isolated showers late | Very calm; glassy mornings common | Low to moderate |
| November | Light, turning northwest late | Rising; short afternoon storms return | Calm with occasional squall chop | Low |
| December | Northwest establishing | Rising sharply | Chop returns to north-facing water | Low |
Water temperature, visibility and what the season does underwater
Air temperature in Komodo barely moves across the year, sitting in the high twenties Celsius most days. Water temperature moves considerably, and it moves by location as much as by month, because the southeast monsoon drives cold upwelling into the southern part of the park.
| Period | North park water | South park water | Typical visibility |
|---|---|---|---|
| December to March | Warm, upper twenties Celsius | Warm, close to northern temperatures | Variable; runoff and plankton can cut it back |
| April to May | Warm | Beginning to cool | Often at its clearest |
| June to September | Warm | Noticeably colder from upwelling; a wetsuit is worth having | Good in the north, plankton-reduced in the south |
| October to November | Warm | Warming again | Generally good |
Plankton is the trade-off. The blooms that reduce visibility are the same blooms that bring feeding mantas to Manta Point and the wider park anchorages. Clear blue water and heavy manta activity are rarely the same day. Taka Makassar, Pink Beach and the reef edges near Kalong sit in the sheltered centre of the park and stay snorkel-friendly across most of the calendar.
What the conditions mean on a 29-metre phinisi
Riley Phinisi is a traditional Buginese schooner built in 2020 in Bulukumba, South Sulawesi, with an ulin ironwood and teak hull, 29 metres length overall and a 5-metre beam. Her cruising speed is 6 to 9 knots under the Mitsubishi 6D16 main engine. Those numbers matter for reading the table above: a 29-metre hull at 7 knots crosses the park in hours, not minutes, so the crew plan legs against wind and tide rather than pushing through them.
In practice, the northwest monsoon months mean more time using the eastern and southern lee of the islands. The southeast monsoon months mean the opposite: northern anchorages are the calm side, and exposed southern coastlines are left to the swell. Full technical detail is on the Riley Phinisi specifications page, including the 22 kVA and 30 kVA generators and 5 tons of fresh water that keep four ensuite air-conditioned cabins and the deck jacuzzi running in humid weather.
Motion is season-dependent but rarely severe inside the park, since almost every night is spent at anchor rather than under way. Guests who are sensitive to movement should read our note on managing seasickness on board before a June to August trip.
Using this data to shape an itinerary
Conditions change which order the sites make sense in, not usually whether they happen. Padar, Pink Beach, the dragon walks on Komodo and Rinca, Manta Point, Taka Makassar and the Kalong flying-fox anchorage are all reachable across the year; the sequencing changes. The standard structures are set out on the Riley itinerary page, and further practical questions are answered in the Riley charter FAQ.
Private charter is published at USD 3,350 per night for 2026 and USD 3,800 per night for 2027, for a maximum of 10 guests. Rate detail sits on the pricing page and the booking page.
Frequently asked questions
Which month has the calmest sea in Komodo?
April and October are typically the flattest, because both sit between monsoons with light and variable wind. Mornings in those months are often glassy across the central park. They are averages rather than promises: a single passing system can put chop on any month, and tidal current remains strong regardless.
Is Komodo sailable during the rainy season?
Yes. January and February are the wettest months, with heavy showers and gustier northwest wind, but rain in Komodo usually arrives as concentrated squalls rather than all-day drizzle. The islands are green, crowds are thinner, and sheltered anchorages remain workable. Northern crossings are the choppiest part of a wet-season trip.
How rough does the south coast get in July and August?
That is when Southern Ocean swell hits Komodo’s south-facing coasts hardest, combined with the strongest southeast wind of the year. South-facing sites become uncomfortable or unusable in that window, so itineraries shift north and into the lee of the islands, where anchorages stay calm.
Do currents depend on the month or on the moon?
On the moon. Komodo’s currents are tidal, so they peak around new and full moon spring tides and ease near the quarter moons, in every month of the year. This is why snorkel and dive timing is set by the tide table on the day rather than by the season.
Does the season change what you can see underwater?
It changes the balance. The southeast monsoon pushes cold, plankton-rich water into the southern park, which lowers visibility there but increases feeding activity. Transition months often give the clearest water. Manta encounters are possible year-round and tend to correlate with plankton rather than with a fixed calendar month.
Checking availability
Riley Phinisi is operated by Komodo Luxury from her home port in Labuan Bajo, Flores. Live availability, seasonal date advice and confirmed quotations come from that team directly: Komodo Luxury, WhatsApp +62 811-3823-875, or email [email protected]. If you send your preferred month, the reservations team can tell you what the water is likely to do in that window and how the itinerary would be sequenced around it.