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Koh Haa Cathedral, Koh Phi Phi in Thailand

Koh Haa Yai, the largest island in the group, is a popular destination for divers in Thailand's Krabi Province. This stunning dive site offers a variety of attractions, including three magnificent caverns located on the southwest side of the island. Many divers are drawn to these caverns, which are often mistakenly referred to as Koh Haa Five.

The highlight of Koh Haa Yai is The Cathedral, the largest of the three caverns. Accessible through an opening ranging from 6 to 13 meters, this cavern allows divers to surface inside and witness the breathtaking view above and around. Sunlight filters through the waters below, illuminating the ancient stalactites hanging from the high ceilings, creating a magical effect. The Cathedral is also known for its unique inter-connecting caverns, with one particularly impressive swim-through that resembles a large round tunnel.

Marine life at Koh Haa Yai is abundant and diverse. Divers can encounter fascinating creatures such as harlequin shrimps, leafy ghost pipefish, gorgonian sea fans, and spiny lobsters hiding in cracks. If lucky, one may even have the chance to spot a majestic whale shark cruising along the western side of the island. The waters surrounding Koh Haa Yai offer excellent visibility, averaging 17 meters, providing a clear view of the vibrant underwater world.

For those seeking an alternative route, the area from The Cathedral leading to the western side of Koh Haa Yai is a captivating option. This seldom dived area features a sloping, coral-covered reef with exceptional visibility. As divers descend along the reef slope, they will encounter various coral formations, rocky outcrops, and deeper bommies adorned with soft corals and gorgonian sea fans. Eventually, the route curves around and connects to Koh Haa Five, also known as The Secret Garden, offering a unique exploration opportunity.

The shallow coral garden in front of the beach on Koh Haa Yai is a must-see for snorkelers and beginner divers. Situated at a depth of approximately 6 meters, this area is filled with magnificent coral formations that can reach several meters in height. Among the coral, vibrant marine life thrives, including clown fish, angelfish, rabbitfish, grouper, snapper, wrasse, banner fish, moorish idols, and colorful parrot fish. Turtles, octopus, squid, and cuttlefish are also frequently spotted in this enchanting underwater oasis.

With its captivating underwater scenery, diverse marine life, and accessible dive sites, Koh Haa Yai is a fantastic destination suitable for both beginner and advanced divers. Don't miss the chance to explore this underwater paradise located in Thailand's Krabi Province.

Diving Conditions Score for Koh Haa Cathedral, Koh Phi Phi in Thailand

6.2
Above Average

Decent conditions, proceed with caution.
The score is based on a calculation of the current weather and sea conditions.

Dive Site Overview for Koh Haa Cathedral, Koh Phi Phi in Thailand

Depth

19m

Visibility

17m

Experience Level

beginner
advanced

Weather Conditions for Koh Haa Cathedral, Koh Phi Phi in Thailand

Wave Height

0.56m

Wind Speed

12.8 m/s

Water Temp

31.1°C

Visibility

2.44km

Cloud Cover

95%

Wave Period

6.7s

Air Temperature

27.3°C

Precipitation

5.4 mm

Detailed 7-Day Diving Forecast for Koh Haa Cathedral
Alpha

Dive Score Chart for Koh Haa Cathedral

Best time to dive: 9:00 with score 7.634116795865633/10. Water conditions: Waves 0.58m, Wind 16.6 m/s.Best night dive time: 18:00 with score 7.15966049382716/10.

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

Sunrise at Koh Haa Cathedral: 06:00
Sunset at Koh Haa Cathedral: 18:00

Optimal diving conditions at Koh Haa Cathedral 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
9:00

Score: 7.6/10
Waves: 0.58m (6.45s), Wind: 16.6 m/s

🌙
Best Night
18:00

Score: 7.2/10
Waves: 0.58m, Wind: 15 m/s

Seasonal Analysis for Koh Haa Cathedral, Koh Phi Phi in Thailand
Alpha

Historical patterns and best seasons for diving at Koh Haa Cathedral, Koh Phi Phi 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 Haa Cathedral, Koh Phi Phi 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 Koh Haa Cathedral, Koh Phi Phi in Thailand

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

Ideal Conditions for Koh Haa Cathedral, Koh Phi Phi in Thailand

Water Temp

Thermometer Emoji

27.2°C / 81.0°F

August

Visibility

Telescope Emoji

10.4m / 34.1ft

January

Wave Height

Wave Emoji

2.0m / 6.6ft

March

Wave Period

Wave Emoji

8.0s

January

Seasonal Insights for Koh Haa Cathedral, Koh Phi Phi in Thailand

Koh Haa Cathedral, Koh Phi Phi in Thailand shows typical northern hemisphere patterns with May being the warmest month (28.4°C) and December the coldest (22.9°C). The calmest conditions typically occur in March with average wave heights of 2.0m 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 0.0mm 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 21, 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 Koh Haa Cathedral is Koh Phi Phi

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