Is the Sea Rough for Speedboat Tours in Phuket in Low Season?

By Phuket Thailand Travel · Local Phuket travel experts · Published October 19, 2026

The same 50-minute crossing can feel like a transfer or like two hours of hard work, depending on the month.

Is the sea rough for speedboat tours in phuket in low season? Often yes on the open-water routes, and sometimes rough enough that trips are cancelled outright. From May to October the southwest monsoon pushes swell onto the Andaman side, so crossings to Phi Phi, Racha and the open sea south and west of Phuket can be bumpy, wet and slow. Sheltered Phang Nga Bay is the exception and usually stays comfortable. Conditions vary day to day rather than following a fixed rule, so the practical approach is to pick sheltered routes, travel early in the day and keep your schedule flexible.

Why the sea changes in low season

From around May the wind reverses. The southwest monsoon blows in off the Indian Ocean and hits Phuket’s west coast directly, instead of coming off the land as it does from November to April. That onshore wind builds swell over open water, and the fetch — the distance the wind has to work on the sea — is what makes some routes rough and others barely affected. It is the geometry of the coast, not the rain, that decides how your boat ride feels.

Rain is not the problem

Most people picture low season as wet, but rain is rarely what stops a tour. A tropical downpour usually passes in twenty minutes and does not change sea state much. What stops tours is wind and swell, and occasionally a harbour-master order closing small-boat departures when conditions exceed a threshold. You can have a bright, dry morning with a two-metre swell and no boats going out.

How rough is rough, in practice

On a calm high-season day, the speedboat run from Phuket to Phi Phi Leh takes about 50 minutes and feels like a fast, slightly bouncy ferry ride. In moderate low-season conditions the same boat will throttle back, the crossing stretches past an hour, and you get repeated slamming as the hull comes off each wave, plus spray over the bow seats. In heavier conditions the trip is either rerouted, shortened, or cancelled before it starts.

Who feels it most

Children, older passengers, anyone with back or neck problems and anyone prone to motion sickness will notice moderate conditions far more than an average adult. Pregnancy is a specific concern: most operators will not carry passengers in later pregnancy on speedboats at all, and in low season the repeated impact makes that a sensible restriction rather than a formality. If any of this applies to your group, choose a sheltered route or a larger vessel.

Which routes get rough and which stay calm

The single most useful thing to understand is that Phuket has two very different cruising areas. East of the island, Phang Nga Bay is enclosed, shallow and dotted with limestone karsts that break up any swell, so it stays usable in almost all weather. West and south, the water is open to the Andaman Sea with nothing in between, so it takes the full monsoon swell.

• Phang Nga Bay, James Bond Island, Panak and Hong — sheltered; usually comfortable all year
• Coral Island (Koh Hey) — close inshore to the south; moderately affected
• Phi Phi and Khai Islands — open crossing; noticeably rough in moderate swell
• Racha Yai and Racha Noi — open water to the south; among the first to be cancelled
• Similan Islands — not applicable; the park is closed 16 May to 14 October

The substitution that usually works

If your heart is set on Phi Phi and the forecast is poor, the two realistic alternatives are to move the trip to another day in your stay, or to switch to Phang Nga Bay and James Bond Island for that day and try Phi Phi later. Operators do this constantly in low season, and it is why booking your boat days early in your holiday matters so much.

Speedboat, ferry or catamaran: which handles swell better

Hull length and weight are what matter in swell. A 10–12 metre speedboat is fast and flexible but light, so it reacts to every wave. The large Phi Phi ferries from Rassada pier are slower — about two hours each way — but ride swell far more comfortably, with indoor seating and a toilet. The compromise is that ferries serve Tonsai on Phi Phi Don only and do not reach Phi Phi Leh, so you lose Maya Bay and the Viking Cave from your itinerary.

When a private charter helps

A private speedboat charter does not make the sea calmer, but it gives you control. You can leave at first light when the wind is lightest, change the route mid-trip if a stop looks exposed, and turn back without a group vote. For a family with young children or anyone who gets seasick, that flexibility is worth more in low season than in high season.

Timing: why the morning is calmer

Wind in the Andaman typically freshens through the day, building from late morning and peaking mid-afternoon. That is why most island tours leave between 07:30 and 09:00 and aim to be heading home by mid-afternoon. In low season the difference between a 07:30 and an 11:00 departure can be the difference between a manageable crossing and a hard one, so if you are offered a choice, take the earliest slot.

What a typical low-season tour day looks like

1. The operator checks the forecast and any harbour notice the evening before and again at dawn.
2. A go or no-go decision is usually made between about 06:00 and 07:30 on the day.
3. If it is a go, departure is early and the itinerary may be reordered to use sheltered stops first.
4. Stops can be shortened or swapped at the captain’s discretion if conditions change.
5. If it is a no-go, you are offered a reschedule, an alternative route or a refund, depending on the operator’s terms.

Cancellations, refunds and what to agree in writing

Weather cancellation is the normal cost of doing business in low season, and it is handled well or badly depending entirely on the terms you agreed. Before you pay, get three things in writing: who decides a cancellation and when, what you are offered if it is cancelled (reschedule, alternative tour, or refund), and what happens if the tour departs but stops are dropped because of conditions. A reputable operator will put all three in a message without being pushed.

Partial-itinerary changes

The grey area is not a full cancellation but a shortened one — the boat goes, but two of five stops are skipped because the swell makes them unsafe to approach. Most operators do not refund for that, because the tour ran. Knowing this in advance stops it feeling like a bait and switch. Our article on what happens if your Phuket tour is cancelled due to weather goes through the scenarios in more detail.

How to reduce seasickness on a low-season crossing

Rough water and motion sickness are the two halves of the same problem, and the second is largely manageable. The short version: take medication before you board rather than after you feel unwell, sit low and in the middle of the boat, keep your eyes on the horizon, and eat something light rather than nothing at all. Our full guide, how to avoid seasickness on a Phuket speedboat tour, covers the detail.

• Take an over-the-counter motion-sickness tablet 30–60 minutes before departure, and check with a pharmacist if you take other medication
• Choose seats in the middle of the boat, low down, never the bow bench
• Stay outside in fresh air rather than in an enclosed cabin
• Look at the horizon, not at your phone
• Eat a light breakfast and keep sipping water
• Tell the crew early if you feel unwell — they deal with it every day and can move you to a better seat

Should you book island tours at all in low season?

For most travellers, yes — with adjusted expectations. Many low-season days are perfectly pleasant on the water, and the islands are far less crowded than in February. What changes is certainty. If you have five days in Phuket and one island trip you really want, book it for day one or two and treat it as a plan with a backup rather than a fixture. If you only have one free day and no flexibility, a sheltered Phang Nga Bay trip is the sensible choice.

Who should reconsider

If anyone in your group has a back or neck condition, is in later pregnancy, gets severely motion sick, or is travelling with a toddler, we would steer you away from open-water speedboat routes in low season altogether. Phang Nga Bay, a crewed yacht charter on a larger hull, or a land-based itinerary of viewpoints, Old Town and evening shows will give a much better trip than a difficult crossing.

Beach and swimming safety in the same months

The conditions that make boats bumpy also make the west-coast beaches dangerous. Rip currents on Patong, Kata, Karon, Kamala, Surin and Nai Harn cause drownings most low seasons, and the water often looks deceptively manageable from the sand. Red flags mean do not swim, and that applies regardless of how strong a swimmer you are. On a tour day, swim only where the crew tells you it is safe and stay inside the marked area.

Where to swim instead

East-coast and sheltered-bay beaches, hotel pools, and the calmer stops on a Phang Nga Bay itinerary are the realistic alternatives on a big-swell day. If swimming and snorkelling are the main point of your trip, this is the clearest argument for travelling between November and April instead.

Planning your low-season boat days

1. Decide which islands matter most, then check whether each route is sheltered or open water.
2. Put your open-water trip early in the holiday so there is room to reschedule.
3. Choose the earliest departure offered.
4. Confirm the cancellation and partial-itinerary terms in writing before paying.
5. Have one sheltered alternative and one land-based alternative ready for each boat day.

If you would rather hand the sequencing to someone who watches the forecast daily, our team arranges island hopping and multi-day packages with low-season substitutions built in. For official weather and marine warnings, check the Thai Meteorological Department alongside your operator’s own call on the morning.

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