Phuket, Krabi or Koh Samui: which Thai island base suits your trip

Three beach bases on two different seas, with opposite rainy seasons. How to choose between Phuket, Krabi and Koh Samui by the month you travel, the trip you want and the nights you have.

Start with the month

Look at your travel month before you look at the beaches. Phuket and Krabi face the Andaman Sea, where the dry months run from about December to March. Koh Samui sits in the Gulf of Thailand, where the heaviest rain falls from October to December and the weather is at its most settled from February into the summer. A December honeymoon and a July family holiday point to opposite sides of the country.

Once the month has narrowed the field, the rest is taste. Phuket is the easiest to reach and has the widest range of hotels, beaches and things to do. Krabi has the scenery: limestone cliffs, small islands and a slower pace. Koh Samui is a self-contained island holiday that happens to work when the other two are wet. With five nights or fewer, one base is usually enough.

Two seas, two rainy seasons

Southern Thailand is a narrow peninsula with a coast on each side. The south-west monsoon, from about mid-May to mid-October, brings rain to the western, Andaman side. The north-east monsoon follows, from about mid-October, and pushes the heaviest rain onto the eastern, Gulf side until the turn of the year. Phuket and Krabi are on the first coast. Koh Samui is on the second.

The Thai Meteorological Department’s thirty-year averages show how sharp the difference is. In September, Phuket averages about 350 mm of rain and Koh Samui about 120 mm. In November the position reverses: Koh Samui averages about 445 mm, more than any month in Phuket, while the Andaman coast is drying out.

Two cautions keep this honest. First, the pattern is a tilt, not a switch. Koh Samui still sees rain on roughly thirteen to fifteen days a month from June to September; it is drier than Phuket then, not dry. Second, the cool, dry season that guides to Thailand describe, from November to February, is a description of Bangkok, the north and the Andaman coast. Koh Samui joins it late: November and December are its wettest months, and January there is damper than many visitors expect. These are long-run averages, and no month comes with a guarantee.

Rain is only half of it. On the Andaman side the wet season also roughens the sea, and it is the sea that cancels island trips. A showery day in Phuket town is an inconvenience. A rough day offshore means the boat to Phi Phi does not run.

Phuket: the widest choice, the easiest arrival

Phuket is Thailand’s largest island, joined to the mainland by a bridge, and it behaves more like a small province than a resort. The sandy beaches run down the west coast, from the busy strip at Patong to the calmer bays at Karon and Kata. Inland, Phuket Old Town has streets of Sino-Portuguese shophouses that give you an afternoon away from the sand.

What Phuket offers above the other two is range. There are hotels at every level, restaurants for every diet, and day trips in several directions: the Phi Phi islands by boat in one to two hours, the limestone islets of Phang Nga Bay, and, in season, the Similan Islands from the piers north of the island. It also has the simplest journey. Phuket has non-stop flights from several Indian cities, including Delhi, Mumbai and Bengaluru, though the list changes from season to season.

The cost of that convenience is that Phuket is busy and built up, and distances on the island are longer than they look. Where you stay decides the holiday you have. It suits first-time visitors, families who want choice and short transfers, and groups who cannot agree on one kind of day.

Krabi: limestone, longtails and smaller islands

Krabi is a mainland province, not an island, and its appeal is the landscape. Sheer limestone cliffs rise straight out of the sea and the mangroves, and the standard day out is a longtail boat to a cluster of small islands with a beach each. Ao Nang is the main base, a short drive from Krabi Town and the departure point for most boats.

Railay, the best-known beach, is part of the mainland but cut off from it by cliffs, so it is reached only by boat. That is why it feels like an island and why a rough sea can make it awkward to reach. Phi Phi is about an hour from Ao Nang by boat. Inland there are hot springs, forest pools and a hilltop temple, which matter more than they sound, because they are what you do on the days the boats stay in.

Krabi is quieter than Phuket, with less nightlife and less shopping, and many travellers consider that the point. It suits couples, travellers who would choose scenery over variety, and active visitors who want kayaking and climbing. Phuket and Krabi are about three hours apart by road, which makes them the easiest pair to combine.

Koh Samui: the Gulf-side island

Koh Samui is the island in the fullest sense: you arrive by air or by ferry and the holiday stays within its ring road. Chaweng on the east coast is the main beach and the liveliest. Lamai is a step quieter. Bophut, on the north coast, has the old Fisherman’s Village, a street of wooden shophouses that fills with a walking market once a week.

Its signature day out is Ang Thong, a marine national park of forty-two islands about thirty kilometres to the west, visited by boat for snorkelling and kayaking. Ferries also run to Koh Phangan and Koh Tao, which is useful for anyone who wants to dive.

Samui takes more effort to reach. Its airport is owned by Bangkok Airways and served by very few airlines, and there is no non-stop flight from India, so most travellers connect in Bangkok. The alternative is to fly to Surat Thani on the mainland and cross by ferry, a road transfer to the pier followed by forty-five to ninety minutes on the water depending on the boat. Samui suits honeymooners, travellers who want one comfortable base and no moving about, and anyone whose dates fall in the Andaman wet season.

Choosing by month

From December to March, the Andaman coast is at its best. Choose Phuket or Krabi, or both. Koh Samui improves through January and is reliably good by February.

In April and May the whole south is hot. The Andaman coast is still workable in April and turns wet in May. Koh Samui is in a settled stretch, which makes it the safer choice for the Indian summer holidays.

From June to September, Koh Samui is the stronger pick for a beach holiday. Phuket and Krabi remain open, hotels are less full and the rain often comes in heavy spells with dry hours between, but island trips are less dependable and some are closed altogether.

October and November are the awkward months. The Andaman coast is at or just past its wettest and the Gulf is entering its own. If the dates cannot move, Phuket in November is usually the better bet of the three, on the understanding that boat days may need to shift.

Boats, parks and seasonal closures

Several of the places that appear in brochures are national parks with fixed annual closures, and they follow the same seasonal logic. The Similan and Surin islands, the best snorkelling and diving within reach of Phuket, close every year from about mid-May to mid-October.

Maya Bay, on Phi Phi Leh, closes each year for August and September. When it is open, swimming in the bay is not allowed: visitors land on the far side of the island, walk across, and stay for a limited time at the water’s edge. Boat trips around Phi Phi continue while the bay is shut.

On the Gulf side, Ang Thong marine park closes from the start of November until some point in December, in the wettest part of Samui’s year. Exact dates for all of these are set by the Department of National Parks each season, sometimes at short notice, so treat them as a pattern and confirm before fixing a day around one.

When to combine two bases, and when not to

Phuket and Krabi combine well. They share a coast and a season, the road between them takes about three hours, and they are different enough to justify the move: a few days of choice and convenience, then a few of scenery and quiet. Seven nights split four and three is a comfortable version.

Crossing between the two seas is a larger decision. From Krabi to Koh Samui by road and ferry is four to five hours, and from Phuket it is most of a day; a short direct flight links Phuket and Samui, on limited schedules. More important, the two coasts are rarely at their best in the same week, so a trip that includes both works best from about February to April, when both sides are reasonably dry.

How few nights the crossing needs depends on who is doing the arranging. A packaged itinerary can cover both seas in as little as four nights, because the transfer runs door to door and nothing is left to chance, and for a traveller set on seeing both coasts that is a fair trade. As a recommendation for a first trip, we would give it six nights or more, so that the travel day does not come out of a short beach stay.

Three bases in a week is the point at which moving starts to crowd out the beach. It can be done, and it suits travellers who want variety more than rest, but each move costs most of a day. If Bangkok is also part of the plan, count it as a base.

Honeymoons, families and active trips

For a honeymoon, the choice is between Krabi’s scenery and Samui’s seclusion, and the wedding date usually decides it: Krabi, or Phuket with Krabi, for a winter wedding, and Koh Samui for a summer one.

For a family, Phuket is the practical answer. The flight is direct, the transfers are short, and there is something for a child to do on a wet afternoon. Koh Samui is the alternative when the school holidays fall in May or June.

For a first visit to Thailand, Phuket again, often with a few nights in Bangkok first. It asks the least of you and shows a great deal.

For active travellers, Krabi is the strongest base for kayaking and rock climbing, and the Gulf islands beyond Samui for learning to dive.

Planning your Thailand trip

Our Thailand guide covers the country as a whole, including entry requirements. Those changed more than once in 2026: as of 3 October 2026, the Royal Thai Embassy in New Delhi lists a thirty-day visa exemption for Indian passport holders visiting as tourists, in force since 15 September 2026, so check the current position before you book. The Krabi guide goes into the province day by day. If the trip is a honeymoon, our honeymoon destinations collection sets Thailand beside the alternatives.

Our itineraries are built on the same choices. For a single base there is Phuket with Old Town and Phi Phi in four nights, Krabi with the Seven Islands tour or a four-night Koh Samui beach stay. For one coast and two bases, the Phuket and Krabi honeymoon takes five nights. For both seas, Krabi and Koh Samui in six nights makes the crossing by road and ferry. See every Thailand itinerary; each can be moved to the coast that suits your month.

Sources

• Climatological Data of Thailand for 30 Year Period (1991–2020) — Thai Meteorological Department
• The revision of Thailand’s visa exemption and visa on arrival schemes — Royal Thai Embassy, New Delhi
• Visa information — Royal Thai Embassy, New Delhi
• Donsak to Koh Samui ferry timetable — Raja Ferry Port
• Ferry routes to Koh Samui, Koh Phangan and Koh Tao — Lomprayah High Speed Ferries
• IndiGo commences direct flights from Mumbai and Bengaluru to Krabi — IndiGo
• Mu Ko Similan National Park — Thai National Parks
• Mu Ko Ang Thong National Park — Thai National Parks
• Similan and Surin islands close for five months — The Nation (Thailand)
• Annual closure of Maya Bay — Asian Trails
• Thailand’s national park system starts annual seasonal closure of attractions — TAT Newsroom (Tourism Authority of Thailand)