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Ao Yai, Koh Tachai, Koh Surin in Thailand

The Tachai Pinnacle, located in the Phang-nga Province of Thailand, is a popular rocky dive site adorned with abundant boulders. In the midst of these rock formations, one can discover a captivating array of gorgonians and vibrant fan corals in various hues.

This underwater paradise is teeming with an astonishing variety of marine life, making it a must-visit destination for divers of all levels. From graceful manta rays to majestic whale sharks, encountering these magnificent creatures is always a possibility at Tachai Pinnacle. Barracuda shoals have made this site their home for countless years, while the presence of batfish adds to the allure of this dive site.

While exploring beneath the cerulean blue waters, divers may also come across sizable schools of big mackerels. Additionally, for those with a keen eye for detail, the opportunity to observe mesmerizing macro life such as nudibranchs and coral crabs awaits. It is advisable to have some diving experience for this particular dive, although it serves as an excellent opportunity for divers to familiarize themselves with drift diving techniques.

With a maximum depth of 21 meters and visibility reaching up to 14 meters, the Tachai Pinnacle offers an optimal setting for underwater exploration. Furthermore, this remarkable dive site is suitable for divers at the beginner level, enabling them to embark on an unforgettable diving adventure in Thailand's pristine waters.

Diving Conditions Score for Ao Yai, Koh Tachai, Koh Surin in Thailand

7
Good

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

Dive Site Overview for Ao Yai, Koh Tachai, Koh Surin in Thailand

Depth

21m

Visibility

14m

Experience Level

beginner

Weather Conditions for Ao Yai, Koh Tachai, Koh Surin in Thailand

Wave Height

0.72m

Wind Speed

15.7 m/s

Water Temp

29.8°C

Visibility

36.78km

Cloud Cover

96%

Wave Period

9.25s

Air Temperature

29.9°C

Precipitation

0 mm

Detailed 7-Day Diving Forecast for Ao Yai, Koh Tachai
Alpha

Dive Score Chart for Ao Yai, Koh Tachai

Best time to dive: 10:00 with score 8.102426241134753/10. Water conditions: Waves 0.76m, Wind 7.3 m/s.Best night dive time: 21:00 with score 7.476583033932136/10.

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

Sunrise at Ao Yai, Koh Tachai: 06:00
Sunset at Ao Yai, Koh Tachai: 18:00

Optimal diving conditions at Ao Yai, Koh Tachai 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
10:00

Score: 8.1/10
Waves: 0.76m (9.4s), Wind: 7.3 m/s

🌙
Best Night
21:00

Score: 7.5/10
Waves: 0.72m, Wind: 17.8 m/s

Seasonal Analysis for Ao Yai, Koh Tachai, Koh Surin in Thailand
Alpha

Historical patterns and best seasons for diving at Ao Yai, Koh Tachai, Koh Surin 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 Ao Yai, Koh Tachai, Koh Surin in Thailand

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 Ao Yai, Koh Tachai, Koh Surin in Thailand

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

Ideal Conditions for Ao Yai, Koh Tachai, Koh Surin in Thailand

Water Temp

Thermometer Emoji

26.9°C / 80.4°F

August

Visibility

Telescope Emoji

11.0m / 36.1ft

March

Wave Height

Wave Emoji

1.5m / 4.9ft

March

Wave Period

Wave Emoji

8.0s

January

Seasonal Insights for Ao Yai, Koh Tachai, Koh Surin in Thailand

Ao Yai, Koh Tachai, Koh Surin in Thailand shows typical northern hemisphere patterns with May being the warmest month (28.1°C) and December the coldest (23.2°C). The calmest conditions typically occur in March with average wave heights of 1.5m 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 14, 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 Ao Yai, Koh Tachai is Koh Surin

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Koh Surin

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