Koh Kong Yai, Koh Tao in Thailand
The southwestern (deep) side of Koh Kong Yai boasts an abundance of large soft coral, sea fans, barracuda, and batfish. On the shallow side, divers can encounter angelfish, butterflyfish, and other marine life similar to that found around Haad Khom.
The island is home to sheltered, shallow reef areas with depths of less than 10 meters, making it ideal for beginner divers. In the northern and eastern parts of the island, the depth can reach approximately 20 meters. This variation in terrain allows for a wide array of marine species to thrive, making Koh Kong Yai an excellent dive site for student divers. Locals even refer to it at times as the local Sail Rock.
For those planning a visit, Koh Kong Yai is conveniently located near Coconut Bar and Pedestrian access to Bottle Beach in Surat Thani Province, Thailand.
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Diving Conditions Score for Koh Kong Yai, Koh Tao in Thailand
Very good diving conditions!
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Koh Kong Yai, Koh Tao in Thailand
Depth
12m
Visibility
6m
Experience Level
Weather Conditions for Koh Kong Yai, Koh Tao in Thailand
Wave Height
0.1m
Wind Speed
7.6 m/s
Water Temp
31°C
Visibility
36km
Cloud Cover
73%
Wave Period
2.4s
Air Temperature
28.3°C
Precipitation
0 mm
Dive Score Chart for Koh Kong Yai
Best time to dive: 13:00 with score 9.105555555555554/10. Water conditions: Waves 0.06m, Wind 4 m/s.Best night dive time: 18:00 with score 8.15502962962963/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Optimal diving conditions at Koh Kong Yai 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.
Score: 9.1/10
Waves: 0.06m (2.25s), Wind: 4 m/s
Score: 8.2/10
Waves: 0.08m, Wind: 6.3 m/s
Seasonal Analysis for Koh Kong Yai, Koh Tao in ThailandAlpha
Historical patterns and best seasons for diving at Koh Kong Yai, Koh Tao in Thailand
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 Koh Kong Yai, Koh Tao in Thailand
Winter
Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.
Best Months for Koh Kong Yai, Koh Tao in Thailand
Ideal Conditions for Koh Kong Yai, Koh Tao in Thailand
Water Temp
27.0°C / 80.6°F
August
Visibility
12.4m / 40.7ft
March
Wave Height
1.4m / 4.6ft
March
Wave Period
8.0s
January
Seasonal Insights for Koh Kong Yai, Koh Tao in Thailand
Koh Kong Yai, Koh Tao in Thailand shows typical northern hemisphere patterns with June being the warmest month (28.1°C) and December the coldest (22.5°C). The calmest conditions typically occur in March with average wave heights of 1.4m 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 0.6mm 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.
Last updated: 1 min. ago - Jun 18, 2026