Sanbondake
Sanbondake, also known as Onohara Island, is a captivating dive site located an hour away by boat from Miyakejima, Japan. Positioned off the coast of Miyakejima, this uninhabited reef promises an exhilarating experience for seasoned divers. With its strong currents, Sanbondake is exclusively recommended for expert divers. The dive here is a thrilling drift style adventure, only viable during favorable sea conditions and currents. Renowned as the most dynamic point in Miyakejima, this site offers breathtaking encounters with vast schools of fish and impressive migratory species.
Prepare to be mesmerized by the presence of immense schools of sea squirts and hawks during your dive. Keep a lookout for the magnificent giant campachi and the occasional sighting of swallows. Sanbondake is also notable for its significant population of hammerhead sharks, and you may even come across a majestic tiger shark.
Discover the unparalleled underwater wonders of Sanbondake, Miyakejima, Japan - a true paradise for experienced divers seeking an extraordinary adventure filled with marine marvels.
Prepare to be mesmerized by the presence of immense schools of sea squirts and hawks during your dive. Keep a lookout for the magnificent giant campachi and the occasional sighting of swallows. Sanbondake is also notable for its significant population of hammerhead sharks, and you may even come across a majestic tiger shark.
Discover the unparalleled underwater wonders of Sanbondake, Miyakejima, Japan - a true paradise for experienced divers seeking an extraordinary adventure filled with marine marvels.
Diving Conditions Score for Sanbondake
6.7
Above AverageDecent conditions, proceed with caution.
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Sanbondake
Experience Level
expert
Weather Conditions for Sanbondake
Wave Height
2.1m
Wind Speed
12.6 m/s
Water Temp
25.3°C
Visibility
22.04km
Cloud Cover
53%
Wave Period
7.2s
Air Temperature
23.3°C
Precipitation
0 mm
Detailed 7-Day Diving Forecast for Sanbondake
Alpha
Dive Score Chart for Sanbondake
Best time to dive: 8:00 with score 6.3561/10. Water conditions: Waves 1.84m, Wind 3 m/s.Best night dive time: 5:00 with score 5.7845/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Sunrise at Sanbondake: 06:00
Sunset at Sanbondake: 18:00
Optimal diving conditions at Sanbondake 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
8:00Score: 6.4/10
Waves: 1.84m (7.55s), Wind: 3 m/s
Best Night
5:00Score: 5.8/10
Waves: 1.78m, Wind: 4.3 m/s
Seasonal Analysis for SanbondakeAlpha
Historical patterns and best seasons for diving at Sanbondake
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 Sanbondake
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 Sanbondake
January
Score: 10.0
February
Score: 10.0
March
Score: 10.0
Ideal Conditions for Sanbondake
Water Temp
23.4°C / 74.1°F
June
Visibility
20.1m / 65.9ft
October
Wave Height
0.2m / 0.7ft
January
Wave Period
8.0s
January
Seasonal Insights for Sanbondake
Sanbondake shows typical northern hemisphere patterns with June being the warmest month (23.4°C) and December the coldest (19.4°C). The calmest conditions typically occur in January with average wave heights of 0.2m 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 0.0mm 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.
Last updated: 1 min. ago - Jun 22, 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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