Scuba Diving at Koh Ma

Diving atKoh Ma (Thailand)

Koh Ma presents itself as a dynamic dive location, characterized by its dramatic shelving bottom. Divers explore a transition from vibrant shallow coral reefs to deeper formations of black and soft corals. Access to the site is flexible, allowing for both boat and shore entries, while the dive reaches a maximum depth of 25 m (82 ft).

As evening covers Koh Ma, the local air temperature is measured at 29°C. The current wave height at the surface is recorded at 0.1 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.

Coordinates9.8008, 99.9769
Site Characteristics
Beach
Max Depth25m / 82ft
Entry TypeBoat & Shore
Water Typesalt
Dive Types
ReefWall

Dive Site Overview

Koh Ma's underwater topography accommodates a wide range of diving proficiencies. Starting from its adjacent island, the seabed gradually shelves downwards, creating a seamless transition from vibrant, sunlit shallow coral gardens to more profound zones.

Deeper areas reveal intriguing formations of black and soft corals, extending to a maximum depth of 25 m (82 ft). Extensive reef systems and engaging wall sections provide varied exploration opportunities. Dive locations are flexibly accessed, supporting both boat-based excursions and shore entries, depending on the specific dive plan and logistical considerations.

Adaptability allows different groups to tailor their experience. For those just beginning, PADI Discover Scuba Diving experiences are readily available in the shallower, protected areas.

Certified PADI Open Water Divers will find ample scope for exploration within the upper and mid-depth ranges, where reef fish are abundant.

However, to fully engage with the site's entire structure, particularly its deeper coral formations and wall elements, PADI Advanced Open Water Diver certification is recommended. A rich population of various reef fish thrives in the marine environment, and divers often report encounters with sizable brown-marbled groupers. Occasional sightings of pelagic species add another layer of excitement to these dives.

Koh Ma

Conditions are Good

7/10
Confidence: 8/10
Indicates meteorological model agreement and data availability.

Best Dive Window

Optimal conditions expected

06:12
18:45
H: 10:45
L: 16:20
Air / Sea Temp
29° / 31°
Wave Height
0.2 m
Wind Speed
27 km/h WSW
Rain Chance
100%

Current conditions near Koh Ma show 29° air, 31° sea temperature, 0.2 m waves, and 27 km/h wind. Forecast data is refreshed regularly to ensure accuracy.

Radius: ~12km
Updated: Jun 14, 2026, 08:32 local time
MARINE: OPEN-METEOWEATHER: YR.NO

Best Time to Dive

Planning a dive at Koh Ma benefits from understanding seasonal shifts, with conditions varying between good and excellent scores throughout the year. February to May, along with October, typically offers excellent diving. During these months, air temperatures remain comfortably warm, averaging between 27.5°C (82°F) and 29.5°C (85°F), with significantly lower rainfall (e.g., April sees only about 1.62 mm). Wave heights are generally minimal, often around 0.3 to 0.5 meters, contributing to clearer conditions. Conversely, months like November, while still rated as good for diving, experience higher average rainfall, reaching around 9.94 mm, and slightly larger wave heights of about 0.6 meters. Even in these rainier periods, air temperatures stay within a pleasant 27°C to 29°C (80.4°F to 84.0°F) range, maintaining tropical warmth.

PEAK SEASON SCORE

93/100
Excellent

Scores combine air & water temps, waves, wind & rainfall for overall conditions.


BEST MONTHS TO DIVE

MAR
APR
MAY
DIVE SCORE
(0–100)
88
JAN
90
FEB
93
MAR
95
APR
92
MAY
87
JUN
85
JUL
87
AUG
85
SEP
90
OCT
80
NOV
83
DEC
AIR TEMP (°C)
27
28
28
30
29
29
29
28
28
28
27
27
WAVES (M)
0.6
0.5
0.4
0.3
0.3
0.4
0.5
0.4
0.5
0.3
0.6
0.6
WIND (KM/H)
19
18
18
16
18
22
23
22
23
17
20
20
RAIN (MM)
1.3
2.2
1.0
1.6
4.4
3.2
5.3
4.3
5.4
9.0
9.9
5.9
DIVE SCORE GUIDE (0–100)
Excellent (90–100)
Very Good (80–89)
Good (70–79)
Moderate (50–69)
Poor (30–49)
Not Recommended (0–29)

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

Underwater, Koh Ma's profile transitions from an easily accessible shallow reef to a more complex, deeper environment. Initial sections near the island feature vibrant coral reefs, gradually sloping downwards. As divers descend, coral types shift, introducing formations of black and soft corals that add textural diversity to the landscape. While specific water temperatures aren't consistently reported, typical tropical conditions mean warm waters generally prevail, allowing for comfortable diving without heavy thermal protection. Maximum depth reaches 25 meters. Varied terrain, from sandy slopes to more vertical wall elements, provides interest for divers keen on exploring different underwater structures.

Dive Difficulty & Safety Guidelines

Approaching any dive requires adherence to safe diving practices, and Koh Ma is no exception. Given the maximum depth of 25 meters (82 feet), divers should ensure their certification level aligns with their intended dive profile; Advanced Open Water certification is beneficial for exploring the full extent of the site. It's always prudent to consult with local dive professionals before entering the water, as they provide the most current information on conditions like currents and visibility. While no specific hazards are consistently reported for Koh Ma, standard situational awareness and buddy system protocols are essential. Planning your gas consumption carefully, especially when exploring deeper wall sections, ensures a safe and enjoyable experience.

Recommended Equipment

  • Dive Computer
  • DSMB

This gear list is based on verified equipment signals for Koh Ma, Thailand. Always confirm final gear choices with your dive operator, guide, or liveaboard.

Recommended Dive Suit

Forecast models show minimal temperature variation in the coming days.

Some divers prefer slightly warmer exposure protection simply for additional comfort.

Dive skin or rash guard usually works well for maintaining comfort during standard dive profiles in these conditions. A hood or vest is suggested for sensitive divers due to surface winds. The surrounding waters at Koh Ma are currently registering temperatures of roughly 31°C (87°F). Surface air temperatures are resting at 29°C (84°F).

Koh Ma conditions last reviewed: 08:32 local time (UTC+7), Jun 14, 2026

Emergency & Medical Support

Essential information to help you plan your dive trip to Koh Ma.

Hyperbaric Chamber

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
24/7 Available

Divers Alert Network

Diving emergency assistance available through DAN World.

+1-919-684-9111
  • 24/7 emergency hotline
  • Diving medical assistance
  • Evacuation coordination
View official DAN emergency contacts

Emergency contacts are provided for reference. Always verify local emergency services before diving.

Marine Life at Koh Ma

Marine life at Koh Ma immediately impresses with its resident reef fish population, active across the coral formations. Divers frequently observe a good range of these colorful species. Large brown-marbled groupers are also a notable presence, often seen occupying crevices or moving along the shelving bottom. Occasional encounters with passing pelagics add an element of excitement. Additionally, wider reports suggest common sightings of sharks, whales, dolphins, and turtles in the general vicinity, though specific sightings are always subject to natural variability.

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Nearest Airports

Nearest airports to help plan travel to this dive area.

Samui International AirportUSM
30 km
Surat Thani AirportURT
118 km
Chumphon AirportCJM
121 km
💵Currency:THB

Search Flights

Check available flights and routes on Expedia, using the nearby airports listed in this section.

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Frequently Asked Questions

What is the maximum depth at Koh Ma?

Koh Ma is accessible to a maximum depth of 25 meters. This range offers divers ample opportunity for underwater exploration, from shallow reefs to deeper coral and wall sections.

What kind of marine life can I expect to see?

You can expect to encounter a variety of reef fish and potentially large brown-marbled groupers. There are also reports of passing pelagics, and common sightings of sharks, whales, dolphins, and turtles.

What dive certifications are recommended for Koh Ma?

PADI Open Water Diver certification is suitable for much of the site. To fully explore the deeper sections, including the black and soft corals at max depth, a PADI Advanced Open Water Diver certification is recommended. PADI Discover Scuba Diving experiences are also an option for beginners.

How do divers access the Koh Ma dive site?

Divers have flexible access options at Koh Ma. Entry can be made either by boat, typically arranged through local dive operators, or directly from the shore, depending on the specific dive plan and entry point.

Are there different dive environments at Koh Ma?

Koh Ma features a shelving bottom, transitioning from vibrant shallow coral reefs to deeper areas with black and soft corals, along with some wall sections.

Is Koh Ma suitable for beginner divers?

Yes, Koh Ma is suitable for beginners through options like PADI Discover Scuba Diving experiences. PADI Open Water Divers can also enjoy much of the site's shallower areas.

What are the water temperatures like at Koh Ma?

Specific water temperatures aren't consistently reported, but Koh Ma is in a tropical region. Divers should anticipate warm, comfortable waters typical of tropical Southeast Asia throughout the year.

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