Ko Muk
Island Small island with Emerald Cave and limestone cliffs
Trang island famous for the Emerald Cave (Tham Morakot), sea caves and coral snorkeling; tourists arrive by longtail boat for the cave, beaches and island seafood.
Ko Muk (Koh Mook) is an island off the Trang coast in southern Thailand, part of the Trang island group in the Andaman Sea. It is best known for a sea cave that leads to a hidden inner lagoon and beach, and for a mix of small sandy bays and fishing-village accommodations.
The most famous feature is the sea-cave passage that connects the open sea to an internal lagoon and small sandy beach; visitors arrive by longtail boat and enter the cave at low tide to reach the sheltered bay. Other attractions include snorkeling along nearby reefs and low-key village beaches with guesthouses and eateries.
The island has long been home to local fishing communities and developed modest tourist infrastructure from the late 20th century onwards to serve beachgoers and day-trippers. The sea cave is a natural formation rather than a man-made structure and has been the island’s principal draw for visitors.
Ko Muk lies off the Trang coastline and is typically reached by boat from the Pak Meng area or nearby mainland piers in Trang province. The island is one of several small islands used as bases for snorkeling and short island-hopping trips.
- Tide-dependent access: Access to the sea cave is tide-dependent; the tunnel is passable only at low tide and during calm sea conditions, so plan visits around local tide tables.
What to See #
- Emerald Cave (Tham Morakot): A sea cave known locally as Tham Morakot or the "Emerald Cave" that is reached by a short boat ride and a brief tunnel swim at low tide to an inner lagoon and small sand beach.
- Village and pier: A small coastal village and pier area serving local fishing communities and guesthouses, providing the main arrival point for boats and island services.
Tips for Visiting Ko Muk #
- Plan the Emerald Cave (Tham Mor) visit for low tide and go with a local longtail operator - the cave is only passable at certain tide levels and operators time the crossing for you.
- Arrive early or stay overnight on Koh Mook to avoid the busiest day-trip traffic; early mornings mean calmer seas and shorter lines for the cave.
- If you want reef time, coordinate snorkeling stops with your boat operator so you visit sheltered coral areas in the morning when waters are usually clearest.
Best Time to Visit Ko Muk #
The best time to visit is November-April when sea conditions are calm and water activities are reliable.
Weather & Climate near Ko Muk #
Tropical climate with consistently warm temperatures year-round. Temperatures range from 22°C to 33°C. Heavy rainfall (2030 mm/year), wettest in September with a pronounced dry season.
January
January is hot, feeling like 30°C with oppressive humidity. Moderate rainfall (32 mm) and partly cloudy skies.
Comfort
Weather
February
February is hot, feeling like 31°C due to high humidity. The driest month with just 28 mm and partly cloudy skies.
Comfort
Weather
March
March is hot, feeling like 32°C due to high humidity. Moderate rainfall (59 mm) and partly cloudy skies.
Comfort
Weather
April
April is the hottest month, feeling like 33°C due to high humidity. Significant rainfall (122 mm) and mostly overcast skies.
Comfort
Weather
May
May is hot, feeling like 33°C with oppressive humidity. Significant rainfall (197 mm) and mostly overcast skies.
Comfort
Weather
June
June is hot, feeling like 32°C with oppressive humidity. Significant rainfall (184 mm) and mostly overcast skies.
Comfort
Weather
July
July is hot, feeling like 31°C with oppressive humidity. Heavy rain (217 mm) and mostly overcast skies.
Comfort
Weather
August
August is hot, feeling like 31°C with oppressive humidity. Heavy rain (266 mm) and mostly overcast skies.
Comfort
Weather
September
September is warm with stifling humidity (dew point 24°C). The wettest month with heavy rain (293 mm) and mostly overcast skies.
Comfort
Weather
October
October is warm with stifling humidity (dew point 24°C). Heavy rain (286 mm) and mostly overcast skies.
Comfort
Weather
November
November is warm with stifling humidity (dew point 24°C). Heavy rain (231 mm) and mostly overcast skies.
Comfort
Weather
December
December is warm with muggy conditions (dew point 24°C). Significant rainfall (115 mm) and mostly overcast skies.
