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Sengen Dragon Hole

Discover the ideal dive site for all levels of divers in Japan. This beach entry location provides excellent conditions for training purposes, with a gradual depth increase to 6-8 meters. What sets this dive site apart is its unique ambiance, as the mesmerizing light filtering through the opening defies expectations of a typical beach entry point. Encounter guaranteed turtle sightings, offering an impressive 120% encounter rate, adding to the allure of this location.

Explore a diverse array of marine species at this site, including green turtles (with a remarkable 120% encounter rate), swallowtails, butterfly fish, amberjacks, debassel fish, senakirilis sparrows, yellow snapper, snappers, longnose hawkfish, and gray reef sharks (with a lower encounter rate). The high encounter rate of green turtles adds an enticing element to this dive experience.

Enjoy excellent underwater visibility of 26m and a maximum depth of 15m, providing optimal conditions for exploration. This dive site is especially suitable for beginners, offering a safe and captivating environment to develop diving skills. Conveniently located near Otsukawa, Amagi, Oshima County, Kagoshima Prefecture, Japan, this accessible dive site ensures a memorable and remarkable underwater adventure.

Diving Conditions Score for Sengen Dragon Hole

8
Very Good

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

Dive Site Overview for Sengen Dragon Hole

Depth

15m

Visibility

26m

Experience Level

beginner

Weather Conditions for Sengen Dragon Hole

Wave Height

0.9m

Wind Speed

16.9 m/s

Water Temp

26.4°C

Visibility

26.36km

Cloud Cover

73%

Wave Period

5.05s

Air Temperature

27.6°C

Precipitation

0 mm

Detailed 7-Day Diving Forecast for Sengen Dragon Hole
Alpha

Dive Score Chart for Sengen Dragon Hole

Best time to dive: 14:00 with score 7.780033333333334/10. Water conditions: Waves 0.94m, Wind 17.4 m/s.Best night dive time: 19:00 with score 7.301833333333334/10.

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

Sunrise at Sengen Dragon Hole: 06:00
Sunset at Sengen Dragon Hole: 18:00

Optimal diving conditions at Sengen Dragon Hole 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
14:00

Score: 7.8/10
Waves: 0.94m (5.6s), Wind: 17.4 m/s

🌞
Safest Overall
17:00

Score: 7.8/10
Waves: 0.92m (5.65s), Wind: 15 m/s

🌙
Best Night
19:00

Score: 7.3/10
Waves: 0.92m, Wind: 15.7 m/s

Seasonal Analysis for Sengen Dragon Hole
Alpha

Historical patterns and best seasons for diving at Sengen Dragon Hole

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 Sengen Dragon Hole

Winter

Avg. Score: 8.5/10

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

Best Months for Sengen Dragon Hole

January
Score: 8.7
December
Score: 8.4
February
Score: 8.3

Ideal Conditions for Sengen Dragon Hole

Water Temp

Thermometer Emoji

27.9°C / 82.2°F

July

Visibility

Telescope Emoji

11.3m / 37.1ft

January

Wave Height

Wave Emoji

1.6m / 5.2ft

January

Wave Period

Wave Emoji

8.0s

January

Seasonal Insights for Sengen Dragon Hole

Sengen Dragon Hole shows typical northern hemisphere patterns with August being the warmest month (28.0°C) and February the coldest (12.1°C). The calmest conditions typically occur in January with average wave heights of 1.6m and wave periods of 8.0s. The most comfortable wave conditions are in January 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 0.8mm of precipitation. For beginners, the best time to visit would be during January to March, 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 20, 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.

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