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TravelBox

Thailand

Koh Samui

Koh Samui is Thailand's second-largest island and the easiest of the southern islands to reach — it has its own airport. It is also the island people get the weather wrong on.

Which beach suits which trip

The island is ringed by beaches and they are genuinely different. Where you stay decides what your holiday is.

  • Chaweng — the busiest and most developed. Long beach, nightlife, restaurants, shopping. Convenient and loud.
  • Lamai — the second beach, slightly calmer, still well served, good for a mix of families and couples.
  • Bophut and Fisherman's Village — the prettiest and most upmarket. Walking Street on Friday evenings is the best night on the island.
  • Maenam and Choeng Mon — quiet, relaxed, family-friendly, with the calmer water.
  • The south-east and the interior — waterfalls, and the local version of the island that the beaches do not show you.

The weather is the opposite of Phuket's

This is the single most useful fact about Samui, and the one most people miss. It sits on the Gulf of Thailand, not the Andaman Sea, so it runs on the north-east monsoon instead of the south-west one.

Koh Samui is wettest between October and December — exactly when Phuket, Krabi and Phi Phi are drying out and entering their best months. In the first half of the year the pattern reverses: Samui is generally fine while the Andaman coast takes the rain.

If your dates are fixed and the weather matters more than the destination, this decides whether you go to the Gulf or the Andaman.

Getting there

Samui is unusually easy to reach for a Thai island, but the options have real trade-offs.

  • Koh Samui International (USM) has direct flights from Bangkok and a few regional cities. The airport is small, open-air and (deliberately) charming — but fares are higher than to Surat Thani, because one airline group dominates the route.
  • The cheaper route is to fly to Surat Thani on the mainland and take a bus to Donsak pier for the car ferry. It is a long half-day and it costs far less.
  • From Koh Phangan or Koh Tao, ferries run several times a day and the crossings are short.

Beyond the beach

Samui is small enough to see in a couple of outings between beach days.

  • Ang Thong National Marine Park — the day trip worth taking: limestone islands, a hidden lagoon and a viewpoint climb.
  • Wat Phra Yai, the Big Buddha, and Wat Plai Laem next to it.
  • Na Muang waterfalls, in the interior, best after rain.
  • Hin Ta Hin Yai, the grandfather and grandmother rocks on the south coast.

Good to know

Airport
Koh Samui International (USM)
Coast
Gulf of Thailand
Best months
January to September
Wettest
October to December
Main beaches
Chaweng, Lamai, Bophut, Maenam

Common questions

When is the best time to visit Koh Samui?
Roughly January to September, and the first half of the year is the safest bet. The island's wet season is October to December — the opposite of the Andaman coast, which is at its best exactly then. Getting this backwards is the most common planning mistake people make about Samui.
Is it worth flying directly to Samui?
It saves most of a day and the airport is a genuinely pleasant arrival. It also costs more than flying to Surat Thani and taking the ferry from Donsak, which is the cheaper option at the price of a long transfer. Decide based on what your time is worth.
Can I combine Samui with Koh Phangan or Koh Tao?
Yes, and most people do. Ferries link the three islands several times a day and the crossings are short. It is the standard Gulf island-hopping route, and far easier than trying to combine the Gulf with the Andaman coast in one week.

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