Best Beaches in Koh Samui: Which One Suits You, and When to Swim

The best beaches in Koh Samui are spread over three quite different coasts. Samui is Thailand’s second-largest island after Phuket, and its beaches differ more than first-time visitors expect. The east coast has the long, busy sand and the bigger waves. The north coast faces Koh Phangan and is generally calmer. The west coast is shallow and quiet, with the island’s best sunsets.

Which beach is “best” comes down to what you want from a beach day and which month you’re travelling. We go through both, beach by beach, with notes on how the sea usually behaves through the year.

The best beaches in Koh Samui at a glance

How the seasons affect swimming

Sea temperatures around Samui stay at roughly 28–30°C all year. Warmth is never the problem. Calm water is.

• Mid-January to April: generally the driest and calmest period, with February and March usually the driest months. Most beaches are swimmable.
• May to September: a mix of sun and showers. The east coast is often fine for swimming. Thai authorities have warned about box jellyfish around Samui, Koh Phangan and Koh Tao, mainly from July to October (more below).
• Mid-October to December: the north-east monsoon brings Samui’s heaviest rain, with November usually the wettest month. Chaweng and Lamai take the brunt of the onshore wind and often fly red flags. For a swim, the sheltered north-coast bays and the west coast are usually the better bets.

The seasons are a guide, not a promise. In February 2026, during what is normally the dry season, a cold air mass pushed 1–2 m waves onto Chaweng and Lamai and lifeguards raised red flags along the main beaches. Check the flag on the day, whatever the month. For a month-by-month breakdown, see our guide to the best time to visit Koh Samui.

East coast beaches

Chaweng Beach

Chaweng is the island’s longest and busiest beach, at around 5–6 km depending on which source you read. The sand is pale and fine, and the water is deeper and clearer than on most of the north and west coasts. Chaweng Beach Road runs behind the beach, lined with hotels, restaurants, bars and shops, and the Central Festival mall is nearby.

Who it suits: first-time visitors, groups of friends, and anyone who wants restaurants, nightlife and shopping within walking distance. The northern end tends to be quieter than the central stretch.

Swimming: good for most of the year, but Chaweng faces east into the north-east monsoon. From about October to January, and occasionally outside those months, waves and rip currents can make it dangerous. Red flags here are not a formality.

Lamai Beach

Lamai is Samui’s second-biggest beach, at roughly 4–5 km, and sits south of Chaweng over the Lad Koh headland. There are lots of places to stay and eat, but the pace is noticeably slower than in Chaweng. At the southern end are Hin Ta and Hin Yai, the “Grandfather and Grandmother Rocks”, one of the island’s best-known landmarks.

Who it suits: couples and families who want a full-service beach without the Chaweng crowds, and travellers on a mid-range budget.

Swimming: the water is deep enough for proper swimming. Like Chaweng, it’s exposed to the north-east monsoon, so expect rougher conditions late in the year.

Silver Beach (Thong Ta Khian) and nearby coves

Between Chaweng and Lamai, the coast road passes a few small coves framed by boulders. The best known is Silver Beach, also called Crystal Bay or Haad Thong Ta Khian. It’s only about 250 m long, with granite headlands at each end that give it some shelter, and people snorkel around the rocks straight from the sand. Coral Cove, a little further along the same stretch, is a similar small cove.

Who it suits: a half-day swim and snorkel, especially if you’re staying in Chaweng or Lamai.

Things to know: it’s small and gets busy, and roadside parking is limited. Thai beaches are public, so you can use the sand even though resorts back the cove.

North coast beaches

Choeng Mon

Choeng Mon is a sheltered bay of about 1 km in Samui’s north-east corner, close to the airport. The water is usually calm and shallow, which is why families like it. Two small islands, Koh Fan Yai and Koh Fan Noi, sit opposite the southern end. At low tide you can wade out to Koh Fan Noi. Wear water shoes, because the route crosses rocks.

Who it suits: families with young children, and couples who want a quiet beach that’s still a short drive from Chaweng.

Swimming: among the calmest on the island. At low tide the southern end dries out, but the middle of the bay usually stays deep enough to swim.

Bophut

Bophut beach runs along the north coast. At its eastern end is Fisherman’s Village, a street of old shophouses turned into restaurants, cafés and boutiques, with Koh Phangan on the horizon. For much of the year the beach is calmer than the east coast, though it narrows at high tide and can be shallow at low tide.

Who it suits: couples, and families who’d rather spend evenings strolling and eating than in bars. If you’re here on a Friday, the Walking Street night market takes over the village (see our Fisherman’s Village guide).

Bangrak (Big Buddha Beach)

Just east of Bophut, Bangrak is best known for Wat Phra Yai, the Big Buddha temple on the small islet of Koh Faan, and for the piers serving Koh Phangan. Boats moor offshore, so it’s more of a base than a swimming beach, and the water can turn murky in the monsoon months.

Maenam

Maenam is a long, quiet stretch of the north coast, shaded by coconut palms, with views across to Koh Phangan. It’s one of the more low-key areas to stay. The seabed shelves faster here than at Bophut or Choeng Mon, so you reach swimming depth quickly. Good for adults, but keep a closer eye on small children.

Who it suits: long-stay travellers, couples and anyone who’d pick quiet over nightlife.

West and south-west coast beaches

Lipa Noi

Lipa Noi, on the west coast, is a long beach of around 3.5 km that faces the sunset. The water is about as flat as it gets on Samui, but it’s very shallow and the tide retreats a long way. Toddlers can paddle safely. Adults who want a proper swim should go around high tide. During the north-east monsoon the west coast is also usually the most sheltered side.

Taling Ngam

Further south, Taling Ngam is the most rural of the main beaches, with palms, a small fishing community and a handful of resorts. Offshore lie the Five Islands (Koh Si Koh Ha), limestone outcrops where swiftlets nest. Sunsets here are excellent. The water is shallow, parts of the shore are stony, and you’ll need transport for anything beyond your hotel.

Thong Krut and the south coast

The south coast, including Thong Krut and the area around Bang Kao, is very shallow at low tide, when the sea can pull back hundreds of metres. It isn’t a swimming coast. It’s where many boats leave from for Koh Tan and Koh Madsum, the small islands offshore.

Which beach is best for…

• Families with toddlers: Choeng Mon, or Lipa Noi at mid-to-high tide. More ideas in Koh Samui with kids.
• Strong swimmers: Chaweng or Lamai in the calm months, Maenam year-round.
• Snorkelling from shore: the rocks at Silver Beach. For better visibility, take a boat trip to the offshore islands.
• Sunsets: Lipa Noi and Taling Ngam.
• Nightlife and dining on foot: Chaweng, then Lamai.
• A quiet evening walk and dinner: Bophut’s Fisherman’s Village.
• November and December: Choeng Mon, Bophut and the west coast, which are usually calmer than the east.

If you’re also deciding where to base yourself near the best beaches in Koh Samui, our guide on where to stay in Koh Samui compares the same areas for hotels, transport and tour pickup times.

Good to know

• Flags mean something. Red means no swimming. Rip currents come back every monsoon season on the exposed beaches. Don’t assume a lifeguard is on duty.
• Box jellyfish. Officials in Surat Thani have put up warning signs and vinegar stations on beaches. If someone is stung, pour vinegar over the area for at least 30 seconds, don’t rinse with fresh water, and get medical help quickly. Some beaches put up seasonal swimming nets. Where they exist, stay inside them.
• Tides matter on the north, west and south coasts. Check a tide table before planning a swim at Lipa Noi, Taling Ngam or the southern end of Choeng Mon.
• Wear sun protection. The sun is strong even on cloudy days.
• Plan B for red-flag days. If the sea is too rough, spend the day inland. A visit to Samui Elephant Kingdom takes about 3 hours, with morning or afternoon hotel pickup (adults ฿3,000, children 5–11 ฿1,700, under-5s free). The Explore the Real Samui 4×4 Island Safari takes in the Big Buddha, Namuang Waterfall 1 and the Grandfather and Grandmother Rocks in one day.

FAQ