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Sail Rock, Koh Tao

Sail Rock, also known as Hin Bhai, is a renowned dive site located in the Gulf of Thailand. This rocky reef protrudes from the sea, situated between Koh Tao and Koh Phangan. With its unique underwater landscape and absence of large roots, this area teems with a diverse array of fish and other marine organisms, creating captivating fish shadows. As one of Koh Tao's three major open sea sites, Sail Rock is highly favored among divers, particularly due to its frequent encounters with majestic whale sharks.

Prepare to be amazed not only by magnificent whale sharks but also by the sight of swirling schools of barracudas and bigeye trevally, as well as various migratory fish and macros that cater to the preferences of every diver. With its abundant fish population, Sail Rock stands as one of the best dive sites globally.

This acclaimed dive site features a striking limestone formation that rises 40 meters above the sandy bottom and 10 meters above the water's surface. With its stepped-like structures, Sail Rock provides an ideal diving experience for divers of all levels. Furthermore, its renowned vertical chimney, a swim through with openings at depths ranging from 7 to 18 meters, adds to the allure of this remarkable rocky formation.

Conveniently situated 12 kilometers north of Koh Phangan, Sail Rock is easily accessible from the island. Divers exploring this site will encounter vast schools of trevallies, jacks, batfish, and barracudas. The occasional appearance of whale sharks further enhances the appeal of this dive site. The name "Sail Rock" derives from the rock's distinctive sail-like shape.

Specifications:
- Depth Range: 0 - 45 meters
- Common Fish Species: Chevron Barracuda, Pickhandle Barracuda, Yellowtail Barracuda, Longfin Batfish, Bigeyed Trevallies, Golden Trevallies, Raggy Scorpionfish, Blotched Porcupine Fish, Pink Anemone Fish, Malabar Grouper, Yellowbanded Fusiliers
- Visibility: 13 meters
- Maximum Depth: 21 meters
- Recommended Diver Level: Beginner, Advanced

Immerse yourself in the captivating underwater world of Sail Rock, the epitome of an ideal dive site in the Gulf of Thailand.

Diving Conditions Score for Sail Rock, Koh Tao

7.8
Good

Good diving conditions!
The score is based on a calculation of the current weather and sea conditions.

Dive Site Overview for Sail Rock, Koh Tao

Depth

21m

Visibility

13m

Experience Level

beginner
advanced

Weather Conditions for Sail Rock, Koh Tao

Wave Height

0.08m

Wind Speed

13.2 m/s

Water Temp

30.9°C

Visibility

25.04km

Cloud Cover

20%

Wave Period

2.35s

Air Temperature

29.1°C

Precipitation

0 mm

Detailed 7-Day Diving Forecast for Sail Rock
Alpha

Dive Score Chart for Sail Rock

Best time to dive: 6:00 with score 8.141347368421055/10. Water conditions: Waves 0.12m, Wind 14.3 m/s.Best night dive time: 4:00 with score 7.71630303030303/10.

Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.

Sunrise at Sail Rock: 06:00
Sunset at Sail Rock: 18:00

Optimal diving conditions at Sail Rock are affected by daylight hours. Sunrise occurs at 06:00 and sunset at 18:00, which impacts visibility and water temperature for scuba diving and snorkeling.

🌞
Best Overall
6:00

Score: 8.1/10
Waves: 0.12m (1.9s), Wind: 14.3 m/s

🌞
Safest Overall
12:00

Score: 8.0/10
Waves: 0.18m (2.15s), Wind: 8.9 m/s

🌙
Best Night
4:00

Score: 7.7/10
Waves: 0.1m, Wind: 12.6 m/s

Seasonal Analysis for Sail Rock, Koh Tao
Alpha

Historical patterns and best seasons for diving at Sail Rock, Koh Tao

The dive score combines all factors to rate overall diving conditions throughout the year. Higher scores indicate better diving conditions.

Monthly Dive Score Analysis - Seasonal Diving Conditions

Higher values indicate better diving conditions

Seasonal DiveScore Chart

This chart displays monthly diveScore data throughout the year, showing seasonal patterns. The data is presented as a bar chart with an overlaid line graph.Dive scores range from 1 to 10, with 10 being optimal conditions.

Higher values indicate better diving conditions

Best Season for Sail Rock, Koh Tao

Winter

Avg. Score: 10.0/10

Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.

Best Months for Sail Rock, Koh Tao

January
Score: 10.0
February
Score: 10.0
March
Score: 10.0

Ideal Conditions for Sail Rock, Koh Tao

Water Temp

Thermometer Emoji

27.4°C / 81.3°F

August

Visibility

Telescope Emoji

11.0m / 36.1ft

March

Wave Height

Wave Emoji

1.8m / 5.9ft

March

Wave Period

Wave Emoji

8.0s

January

Seasonal Insights for Sail Rock, Koh Tao

Sail Rock, Koh Tao shows typical northern hemisphere patterns with June being the warmest month (28.5°C) and December the coldest (23.1°C). The calmest conditions typically occur in March with average wave heights of 1.8m and wave periods of 8.0s. The most comfortable wave conditions are in March with a low wave steepness ratio, creating gentler swells. January offers the longest wave periods (8.0s), creating more comfortable and predictable conditions for boat entries and exits. Ocean currents are slowest in January (0.5m/s) and strongest in January (0.5m/s). January is usually the driest month with 0.1mm of precipitation. For beginners, the best time to visit would be during March to May, when ocean conditions are calmer with long-period waves and currents are typically weaker. Experienced divers might enjoy the challenges and potentially better visibility during the shoulder seasons, with moderate currents that can improve marine life encounters.

Scoring Legend:
9-10 (Excellent)
7-8 (Good)
5-6 (Average)
3-4 (Poor)
1-2 (Dangerous)

Last updated: 1 min. ago - Jun 19, 2026

Note: This dive site is not a verified dive site. Please dive with caution. This dive site might have incorrect information by the community.

The closest dive destination to Sail Rock is Koh Tao

Koh TaoKoh Tao

Koh Tao

41 Dive sites near Sail Rock in Koh Tao

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