Sohugan
Located about 570km south of Tokyo, between the Ogasawara Islands and Hachijojima Island, this dive site is renowned for its unique rock formation set amidst the awe-inspiring ocean. Rising 99 meters above the water surface from a depth of 2500 meters, this site offers an exhilarating experience for expert divers.
Accessible via a 20-hour charter boat ride, this location in Japan's Hachijō Subprefecture holds a magnificent array of marine life. Migratory fish including bigeye trevally, longnose trevally, kappores, yellowtail, crabs, and large bluefin tuna can be regularly spotted. Moreover, an abundance of shark species and occasional sightings of humpback and beaked whales make this dive site all the more captivating.
However, due to challenging sea conditions and strong currents, diving is only advisable for one to two weeks during the rainy season. The underwater visibility can sometimes reach an impressive 40 meters, providing an astonishingly clear view of the fascinating marine ecosystem.
As reaching this remote location requires considerable effort, only experienced divers should embark on this adventure. Ensuring a thrilling and rewarding experience, this unique dive site in Japan is a must-visit destination for advanced divers seeking an extraordinary underwater exploration.
Accessible via a 20-hour charter boat ride, this location in Japan's Hachijō Subprefecture holds a magnificent array of marine life. Migratory fish including bigeye trevally, longnose trevally, kappores, yellowtail, crabs, and large bluefin tuna can be regularly spotted. Moreover, an abundance of shark species and occasional sightings of humpback and beaked whales make this dive site all the more captivating.
However, due to challenging sea conditions and strong currents, diving is only advisable for one to two weeks during the rainy season. The underwater visibility can sometimes reach an impressive 40 meters, providing an astonishingly clear view of the fascinating marine ecosystem.
As reaching this remote location requires considerable effort, only experienced divers should embark on this adventure. Ensuring a thrilling and rewarding experience, this unique dive site in Japan is a must-visit destination for advanced divers seeking an extraordinary underwater exploration.
Diving Conditions Score for Sohugan
7
GoodGood diving conditions!
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Sohugan
Experience Level
expert
Weather Conditions for Sohugan
Wave Height
1.08m
Wind Speed
14.9 m/s
Water Temp
24°C
Visibility
22.76km
Cloud Cover
50%
Wave Period
8.4s
Air Temperature
23.6°C
Precipitation
0 mm
Detailed 7-Day Diving Forecast for Sohugan
Alpha
Dive Score Chart for Sohugan
Best time to dive: 9:00 with score 7.250391056910568/10. Water conditions: Waves 1.1m, Wind 14.4 m/s.Best night dive time: 5:00 with score 6.574784552845528/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Sunrise at Sohugan: 06:00
Sunset at Sohugan: 18:00
Optimal diving conditions at Sohugan 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
9:00Score: 7.3/10
Waves: 1.1m (8.2s), Wind: 14.4 m/s
Safest Overall
7:00Score: 7.3/10
Waves: 1.1m (8.15s), Wind: 14.2 m/s
Best Night
5:00Score: 6.6/10
Waves: 1.08m, Wind: 15.9 m/s
Seasonal Analysis for SohuganAlpha
Historical patterns and best seasons for diving at Sohugan
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 Sohugan
Winter
Avg. Score: 8.4/10
Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.
Best Months for Sohugan
January
Score: 8.5
December
Score: 8.4
February
Score: 8.3
Ideal Conditions for Sohugan
Water Temp
27.2°C / 81.0°F
July
Visibility
11.6m / 38.1ft
August
Wave Height
2.9m / 9.5ft
April
Wave Period
8.0s
January
Seasonal Insights for Sohugan
Sohugan shows typical northern hemisphere patterns with August being the warmest month (27.4°C) and February the coldest (12.3°C). The calmest conditions typically occur in April with average wave heights of 2.9m 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). August is usually the driest month with 0.4mm 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.
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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