Koh Hey/Coral Bay, Phuket in Thailand
At just 8 meters deep, discover a small wreck that adds a touch of mystery to your underwater adventure. The bay is adorned with beautiful corals, creating a vibrant and colorful underwater landscape. As you descend further, the dive gently slopes towards the sandy ocean floor, revealing the diversity of marine life.
While exploring, you can expect a visibility range of 3-5 meters, providing ample opportunity to admire the fascinating underwater surroundings. However, on exceptionally clear days, visibility can exceed 20 meters, offering a truly immersive and unforgettable experience.
For those who enjoy drift diving, take a thrilling drift to the south where the depth reaches up to 40 meters. Marvel at the vastness of the underwater world as you glide through the currents, guided by the serenity of the sea.
This dive site is not just for scuba divers but also perfect for snorkeling enthusiasts. Get up close and personal with an array of small reef fish and absorb the beauty of the pristine corals. If you're fortunate, you may even encounter impressive shoals of yellow snappers, creating a mesmerizing spectacle.
Experience the extraordinary wonders of this dive site, where the maximum depth reaches 13 meters. With its breathtaking scenery and diverse marine life, it truly is a hidden gem in Thailand's underwater paradise.
Diving Conditions Score for Koh Hey/Coral Bay, Phuket 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 Hey/Coral Bay, Phuket in Thailand
Depth
13m
Visibility
9m
Experience Level
Weather Conditions for Koh Hey/Coral Bay, Phuket in Thailand
Wave Height
0.4m
Wind Speed
4 m/s
Water Temp
30.6°C
Visibility
2.32km
Cloud Cover
98%
Wave Period
7.25s
Air Temperature
27.6°C
Precipitation
0 mm
Dive Score Chart for Koh Hey/Coral Bay
Best time to dive: 17:00 with score 9.051550574712644/10. Water conditions: Waves 0.4m, Wind 4 m/s.Best night dive time: 3:00 with score 8.738336231884059/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Optimal diving conditions at Koh Hey/Coral Bay 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: 0.4m (7.25s), Wind: 4 m/s
Score: 8.7/10
Waves: 0.42m, Wind: 2.5 m/s
Seasonal Analysis for Koh Hey/Coral Bay, Phuket in ThailandAlpha
Historical patterns and best seasons for diving at Koh Hey/Coral Bay, Phuket 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 Hey/Coral Bay, Phuket in Thailand
Winter
Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.
Best Months for Koh Hey/Coral Bay, Phuket in Thailand
Ideal Conditions for Koh Hey/Coral Bay, Phuket in Thailand
Water Temp
26.8°C / 80.2°F
April
Visibility
12.1m / 39.7ft
January
Wave Height
1.3m / 4.3ft
March
Wave Period
8.0s
January
Seasonal Insights for Koh Hey/Coral Bay, Phuket in Thailand
Koh Hey/Coral Bay, Phuket in Thailand shows typical northern hemisphere patterns with May being the warmest month (27.5°C) and December the coldest (22.2°C). The calmest conditions typically occur in March with average wave heights of 1.3m 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 0.4mm 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