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Maguroana

Discover a unique dive site on Yomejima, the southernmost island in the Keita archipelago, located just 50 km away from Chichijima, Japan. Immerse yourself in the breathtaking underwater world where a partially submerged Arc de Triomphe awaits. Witness the mesmerizing congregation of bluefin tuna, with as many as 100 or even more, dwelling within the rock formations.

This exceptional dive location is not only frequented by bluefin tuna but also offers the chance to encounter bluefin crocodiles. Venturing further offshore, you'll be greeted by spectacular schools of fish including the vibrant blue-and-white crested woodpecker and the captivating black-headed coral reefer. Keep your eyes peeled for delightful encounters with playful hand dolphins, observing their graceful movements either from the water's surface or even while diving.

As a drift style dive, please note that due to the prevailing currents, the boat is not anchored. The dive depth reaches approximately 15 meters, making it accessible and suitable for advanced and expert divers alike. Upon descent, choose either the left or right side of the hole to marvel at the magnificent bluefin tuna in their natural habitat.

Enhance your diving experience with excellent visibility of up to 20 meters and a maximum depth of 20 meters. Located near Ogasawara Subprefecture, Tokyo, Japan, this remarkable dive site showcases the beauty of the underwater world right at your fingertips. Uncover the wonders of Yomejima and create unforgettable memories beneath the surface.

Diving Conditions Score for Maguroana

8.6
Very Good

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

Dive Site Overview for Maguroana

Depth

20m

Visibility

20m

Experience Level

advanced
expert

Weather Conditions for Maguroana

Wave Height

1.16m

Wind Speed

8 m/s

Water Temp

27.4°C

Visibility

21.28km

Cloud Cover

50%

Wave Period

8.35s

Air Temperature

25.5°C

Precipitation

0 mm

Detailed 7-Day Diving Forecast for Maguroana
Alpha

Dive Score Chart for Maguroana

Best time to dive: 12:00 with score 8.301265079365079/10. Water conditions: Waves 1.16m, Wind 5.1 m/s.Best night dive time: 18:00 with score 7.8690165680473365/10.

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

Sunrise at Maguroana: 06:00
Sunset at Maguroana: 18:00

Optimal diving conditions at Maguroana 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
12:00

Score: 8.3/10
Waves: 1.16m (8.4s), Wind: 5.1 m/s

🌞
Safest Overall
6:00

Score: 8.3/10
Waves: 1.2m (8.6s), Wind: 3.7 m/s

🌙
Best Night
18:00

Score: 7.9/10
Waves: 1.1m, Wind: 4.5 m/s

Seasonal Analysis for Maguroana
Alpha

Historical patterns and best seasons for diving at Maguroana

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 Maguroana

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 Maguroana

January
Score: 8.6
February
Score: 8.4
November
Score: 8.4

Ideal Conditions for Maguroana

Water Temp

Thermometer Emoji

27.3°C / 81.1°F

August

Visibility

Telescope Emoji

11.7m / 38.4ft

June

Wave Height

Wave Emoji

2.4m / 7.9ft

April

Wave Period

Wave Emoji

8.0s

January

Seasonal Insights for Maguroana

Maguroana shows typical northern hemisphere patterns with July being the warmest month (27.4°C) and January the coldest (14.4°C). The calmest conditions typically occur in April with average wave heights of 2.4m and wave periods of 8.0s. The most comfortable wave conditions are in April 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). March is usually the driest month with 0.1mm of precipitation. For beginners, the best time to visit would be during April to June, 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 19, 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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