The Gulf Coast

The Gulf of Thailand coast is Thailand's gentler shore — calmer waters, a different monsoon rhythm, and a string of islands that have defined Southeast Asian backpacking for decades. If the Andaman coast is the dramatic diva, the Gulf is the easygoing companion: warmer, more sheltered, and home to some of Thailand's most beloved island destinations, from the coconut-grove resort culture of Ko Samui to the legendary parties of Ko Phangan and the dive-school utopia of Ko Tao.

The Gulf coast stretches over 1,800 kilometres from the Cambodian border at Trat in the east, curving south through Chonburi, Rayong, and Prachuap Khiri Khan, then down the Malay Peninsula through Chumphon, Surat Thani, Nakhon Si Thammarat, Songkhla, and Pattani to the Malaysian border.

Eastern Seaboard (Trat to Rayong)

The eastern Gulf coast is Bangkok's closest beach escape and home to some surprisingly pristine islands.

Ko Chang Archipelago

Ko Chang (Elephant Island) is Thailand's second-largest island after Phuket and the centrepiece of the Mu Ko Chang Marine National Park. Unlike flat Samui, Ko Chang is mountainous — its interior is covered in dense tropical rainforest with waterfalls cascading down granite slopes. The western beaches (White Sand, Klong Prao, Kai Bae) face spectacular sunsets over the mainland mountains.

The archipelago includes:

Ko Mak — A small, flat island covered in coconut and rubber plantations. Car-free, family-friendly, and genuinely peaceful. The kind of place where you can hear the waves from your bed.
Ko Kut (Ko Kood) — Thailand's fourth-largest island and perhaps its most beautiful. Crystal-clear water on par with the Maldives, Klong Chao waterfall tumbling into a swimable pool, and a fraction of the tourists found on Samui or Phuket. The Chao Ley fishing village on stilts at the southern tip is atmospheric.
Ko Wai — A tiny island with just a handful of basic bungalows and a coral reef accessible directly from the beach. No roads, no nightlife — just sea and sun.

Ko Samet

In Rayong province, just 4 hours from Bangkok, Ko Samet is the capital's weekend beach escape. A small rocky island (only 6km long) with a string of pretty white-sand bays on the east coast, each with a slightly different character. It's a national park, though you wouldn't know it from the beachfront development.

Upper Gulf (Chonburi to Prachuap Khiri Khan)

Pattaya

Just 150km from Bangkok, Pattaya transformed from a fishing village into a major resort city after the Vietnam War. Its reputation for nightlife is well-known, but modern Pattaya is increasingly family-oriented, with water parks, offshore islands, and the extraordinary Sanctuary of Truth — a 105-metre-tall wooden temple entirely covered in hand-carved mythological figures.

Hua Hin

Thailand's original beach resort, Hua Hin has been popular since the 1920s when King Rama VII built a summer palace here. It retains a distinctly Thai resort atmosphere — less international tourism than Phuket or Samui, more Bangkok weekenders, excellent seafood, and a famous night market. Nearby Pranburi and Khao Sam Roi Yot National Park add mangrove kayaking and cave temples to the mix.

The Samui Archipelago

The three islands of Ko Samui, Ko Phangan, and Ko Tao form the Gulf of Thailand's most famous island group, connected by regular ferry services from Chumphon and Surat Thani.

Ko Samui

Thailand's second-largest island has been a tourist destination since the 1970s, when backpackers arrived by fishing boat. Today it has an international airport (built by Bangkok Airways, lined with tropical gardens), five-star resorts, and a well-developed tourist infrastructure — but it has managed to retain charm through its coconut groves, Buddhist temples, and fishing village heritage.

Key areas:

Chaweng — The longest and busiest beach. White sand, clear water, and a strip of restaurants, bars, and shops behind it. Lively nightlife.
Bophut (Fisherman's Village) — A quieter beach with a charming village of converted Chinese shophouses now housing boutiques and restaurants. Friday night walking street.
Lamai — A large beach south of Chaweng, slightly less developed. Good for swimming.
Maenam — The northern beach, popular with long-stay visitors and families. Buddhist temple on the headland.
Big Buddha (Wat Phra Yai) — The island's most recognisable landmark: a 12-metre seated golden Buddha on a small island connected by causeway.

Ko Phangan

Forever associated with the Full Moon Party — an all-night beach rave on Haad Rin that has been running since the late 1980s, drawing 10,000–30,000 revellers each month. But Phangan is much more than one party beach. The island's northern and western coasts offer:

Bottle Beach — Accessible only by boat or challenging jungle trail. One of the Gulf's most beautiful beaches.
Thong Nai Pan — A horseshoe bay with two beaches separated by a headland. Relaxed, upscale.
Sri Thanu / Zen Beach — The yoga and wellness coast. Dozens of retreat centres, organic cafes, and alternative healing practitioners.
Than Sadet National Park — Waterfalls that Thai kings have visited for centuries (their initials are carved into the boulders).

Ko Tao

Tiny Ko Tao (21 km²) is famous for one thing: scuba diving. More diving certifications are issued here than anywhere else in the world. The combination of warm, relatively calm Gulf waters, impressive marine life (whale sharks visit between March and September), and rock-bottom course prices makes it the world's dive school.

Open Water certification — approximately £200–250 (3 days, including accommodation at many dive schools)
Key dive sites — Chumphon Pinnacle (whale sharks, barracuda), Sail Rock (giant swim-through chimney), Japanese Gardens (shallow coral)
Snorkelling — Shark Bay (blacktip reef sharks), Ao Tanot, Japanese Gardens

Deep South Coast

South of Surat Thani, the Gulf coast passes through:

Nakhon Si Thammarat — A historic city and cultural centre with the magnificent Wat Phra Mahathat, one of the most important Buddhist temples in southern Thailand. The Nakhon coastline is undeveloped and offers authentic fishing village experiences.
Songkhla — A charming lakeside/seaside city with Sino-Portuguese architecture, a large lake (Songkhla Lake, Thailand's largest), and the Songkhla Old Town with street art and restored shophouses.
Hat Yai — Thailand's southern commercial hub, a trading city popular with Malaysian visitors for shopping and food.

Gulf Coast Climate

The Gulf operates on a different monsoon schedule from the Andaman coast:

Best months — February to September (dry or drying, warm, calm seas)
Rainy season — October to December (northeast monsoon brings heavy rain, particularly November)
Year-round warmth — Water temperatures rarely drop below 28°C

This offset monsoon means that when the Andaman coast is wet (May–October), the Gulf coast is often fine — and vice versa. Thailand always has a good beach somewhere.