Diving atKoh Ngam Noi / Vietnamese Island (Thailand)
Koh Ngam Noi's underwater landscape features dramatic craggy limestone formations that extend below the surface. Divers can navigate through natural swim-throughs formed by these rocks, revealing vibrant soft coral gardens. The site offers a picturesque environment, contrasting sharp rock structures with delicate marine growth. Exploring this area provides an immersive encounter with intricate geological features.
As evening covers Koh Ngam Noi / Vietnamese Island, the local air temperature is measured at 28°C. The current wave height at the surface is recorded at 0.3 m. These late-day readings characterize the surface conditions for the night.
Dive Site Location & Key Facts
Everything you need to know about this dive site.
Dive Site Overview
Visiting Koh Ngam Noi, also known as Vietnamese Island, brings divers to a site located 17 kilometers (about 10.5 miles) off the coast of Chumphon. This island, merely a third the size of its sister Koh Ngam Yai, shares its scenic beauty both above and below the waterline.
Craggy limestone formations are a defining characteristic here, observable in the small wooden huts clinging to rocks as well as the extensive underwater structures. At the southern end of the island, divers often discover the premier spot, where natural rock formations create intriguing swim-throughs, inviting exploration through their narrow passages.
The underwater landscape presents primarily reef and drift diving opportunities, reaching a maximum depth of 16 meters (52 ft). It's a popular location for detailed observations, particularly around the rocky areas and crevices where smaller creatures, such as various nudibranchs and crustaceans, are frequently found.
Navigating these geological features offers an engaging recreational dive within a shallower depth range.
Koh Ngam Noi / Vietnamese Island
Conditions are Good
Best Dive Window
Optimal conditions expected
Current conditions near Koh Ngam Noi / Vietnamese Island show 28° air, 30° sea temperature, 0.3 m waves, and 24 km/h wind. Forecast data is refreshed regularly to ensure accuracy.
Best Time to Dive
Optimizing for visibility and calm conditions often steers divers towards the period between January and September, which consistently reports good to excellent dive scores. April, in particular, stands out for excellent diving, characterized by lower wave heights averaging 0.4 meters (1.3 ft) and minimal rainfall. Air temperatures during these prime months typically hover between 27°C (81°F) and 29.5°C (85°F). While conditions are generally favorable across much of the year, divers may encounter increased wave activity, reaching averages of 0.9 meters (3.0 ft), and higher rainfall in November and December. For the clearest underwater views and most comfortable experience, planning a visit outside of the late-year months is advisable.
PEAK SEASON SCORE
Scores combine air & water temps, waves, wind & rainfall for overall conditions.
BEST MONTHS TO DIVE
Monthly records compiled from satellite and marine observation nodes over the last 3 years. Data provided by Open-Meteo and MET Norway.
Dive Experience & Conditions
Divers typically access Koh Ngam Noi via boat, which is the primary entry method for exploring this compelling site. Once below the surface, conditions often allow for drift diving, gently guiding divers along the reef. Navigating the diverse underwater terrain, which includes impressive limestone formations and quieter sandy areas, is part of the experience. Many divers find themselves clinging to the rocks; this practice allows for closer inspection of the intricate ecosystems and smaller marine life. Maximum recreational depth here is 16 meters (52 ft), making it suitable for a range of certified divers seeking reef exploration.
Dive Difficulty & Safety Guidelines
Approaching Koh Ngam Noi safely involves ensuring appropriate training for the site's characteristics. Conditions, including potential currents typical of drift dives, necessitate strong buoyancy control, especially when navigating the natural swim-throughs. Divers should always plan their dive within no-decompression limits for the maximum depth of 16 meters (52 ft) and maintain awareness of their surroundings. Completing courses such as PADI Advanced Open Water Diver, PADI Rescue Diver, or PADI Peak Performance Buoyancy can significantly enhance a diver's ability to safely and confidently explore this environment.
Recommended Equipment
Current and surface separation risk. Local briefing strongly recommended.
- Dive Computer
- DSMB
- Reel / Spool
This gear list is based on verified equipment signals for Koh Ngam Noi / Vietnamese Island, Thailand. Always confirm final gear choices with your dive operator, guide, or liveaboard.
Recommended Dive Suit
Subtle variations in currents or depth can sometimes influence perceived water temperature.
Dive skin or rash guard tends to perform well in water temperatures like those currently observed here. A hood or vest is suggested for sensitive divers due to surface winds. Short-term weather patterns suggest stable conditions for divers visiting the area.
Divers heading to Koh Ngam Noi / Vietnamese Island today should expect water temperatures around 30°C (86°F). Surface air temperatures are resting at 28°C (83°F).
Due to technical issues with our weather providers, data hasn't been fetched for over 48 hours. The data above reflects the conditions at the time of the last successful fetch.
Emergency & Medical Support
Essential information to help you plan your dive trip to Koh Ngam Noi / Vietnamese Island.
Hyperbaric chambers are a critical part of dive safety infrastructure. Availability varies significantly by region, and not all dive areas have immediate access.
Before diving, it's recommended to:
- confirm nearest medical facilities
- check emergency procedures with local dive operators
- ensure dive insurance covers evacuation if required
Divers Alert Network
Diving emergency assistance available through DAN World.
+1-919-684-9111- 24/7 emergency hotline
- Diving medical assistance
- Evacuation coordination
Emergency contacts are provided for reference. Always verify local emergency services before diving.
Marine Life at Koh Ngam Noi / Vietnamese Island
Entering the water, divers often first notice the active schools of fish. Snappers, Jacks, and Yellowtail barracuda are frequently observed congregating around the reef. Near the sandy areas, blue spotted stingrays are commonly spotted resting on the seabed. Moving closer to the rocky formations, divers can engage in searching for different types of nudibranchs, often revealing their vibrant colors. Other sightings include various grouper, boxfish/pufferfish, and triggerfish, adding to the site's visual diversity.
Dive Sites Near Koh Ngam Noi / Vietnamese Island
View all dive sites in ThailandDiscover more underwater gems in this area.
Dive Centers Near Koh Ngam Noi / Vietnamese Island
Working Hours
Today: 09:00 - 19:00
Scuba Birds Diving Center
Mojo Diver
Koh Chang Divers
Roctopus Dive Center
Aloha Diving
The Life Aquatic
Discovery Divers
Nearest Airports
Nearest airports to help plan travel to this dive area.
Search Flights
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Search Flights on ExpediaFrequently Asked Questions
What is the maximum depth at Koh Ngam Noi?
Diving at Koh Ngam Noi permits a maximum recreational depth of 16 meters (52 ft). This depth range makes it accessible for most certified divers, offering ample opportunity for exploration within a safe limit.
When is the best time to dive at Koh Ngam Noi?
Optimizing for visibility and calm conditions, the period between January and September generally reports good to excellent dive scores. April, in particular, often stands out for excellent diving due to lower wave heights and minimal rainfall.
What type of diving can I expect at Koh Ngam Noi?
The underwater landscape primarily offers reef and drift diving opportunities. Divers can navigate natural swim-throughs formed by craggy limestone formations and explore diverse rocky areas alongside quieter sandy patches.
What marine life is commonly seen at Koh Ngam Noi?
Active schools of snappers, jacks, and yellowtail barracuda are frequently observed around the reef. Near sandy areas, blue spotted stingrays are common, and various nudibranchs, grouper, and boxfish can be found among the rocks.
What are the typical diving conditions at this site?
Conditions often allow for drift diving, gently guiding divers along the reef. Potential currents necessitate strong buoyancy control, particularly when navigating the natural swim-throughs. Water temperatures are typically warm, ranging from 22-27°C (72-81°F).
How do divers access Koh Ngam Noi?
Accessing Koh Ngam Noi is typically done via boat, which serves as the primary entry method for exploring this compelling site. The island is located 17 kilometers (about 10.5 miles) off the coast of Chumphon.
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Koh Ngam Noi / Vietnamese Island
Conditions are Good
Best Dive Window
Optimal conditions expected
Current conditions near Koh Ngam Noi / Vietnamese Island show 28° air, 30° sea temperature, 0.3 m waves, and 24 km/h wind. Forecast data is refreshed regularly to ensure accuracy.