Tobishima
Tobishima, located 39 km off the coast of Sakata City in Japan, offers excellent diving opportunities. With visibility ranging from 20 to 30 meters in August, divers can explore the fascinating underwater terrain that drops vertically to a maximum depth of 40 meters. The site boasts a diverse array of corals and isoflavas, which are rarely found in the Tohoku region.
From May to September, Tobishima becomes a gathering spot for schools of bluefin tuna. Divers can also spot jawfish, damselfish, as well as various marine species like lobster, snapper, black rockfish, and a wall of horse mackerel. During autumn, the waters are frequented by gigantic jellyfish measuring over one meter in length.
One of the main attractions for divers is the opportunity to observe hundreds of Steller's sea sharks swarming at Tobishima. This incredible spectacle occurs annually from May to early July, as the sharks gather to give birth and mate.
If you're an advanced or expert diver, Tobishima is a must-visit dive site, offering unique underwater experiences. Located on the 勝浦法木線, 飛島, Sakata, Yamagata Prefecture, 9980281, Japan, it provides easy access for diving enthusiasts.
From May to September, Tobishima becomes a gathering spot for schools of bluefin tuna. Divers can also spot jawfish, damselfish, as well as various marine species like lobster, snapper, black rockfish, and a wall of horse mackerel. During autumn, the waters are frequented by gigantic jellyfish measuring over one meter in length.
One of the main attractions for divers is the opportunity to observe hundreds of Steller's sea sharks swarming at Tobishima. This incredible spectacle occurs annually from May to early July, as the sharks gather to give birth and mate.
If you're an advanced or expert diver, Tobishima is a must-visit dive site, offering unique underwater experiences. Located on the 勝浦法木線, 飛島, Sakata, Yamagata Prefecture, 9980281, Japan, it provides easy access for diving enthusiasts.
Diving Conditions Score for Tobishima
7
GoodGood diving conditions!
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Tobishima
Depth
30m
Visibility
14m
Experience Level
advanced
expert
Weather Conditions for Tobishima
Wave Height
0.22m
Wind Speed
9.4 m/s
Water Temp
22°C
Visibility
5.64km
Cloud Cover
64%
Wave Period
3.45s
Air Temperature
19.3°C
Precipitation
0 mm
Detailed 7-Day Diving Forecast for Tobishima
Alpha
Dive Score Chart for Tobishima
Best time to dive: 9:00 with score 8.722662172284645/10. Water conditions: Waves 0.14m, Wind 2.1 m/s.Best night dive time: 3:00 with score 7.616027118644068/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Sunrise at Tobishima: 06:00
Sunset at Tobishima: 18:00
Optimal diving conditions at Tobishima 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: 8.7/10
Waves: 0.14m (4.45s), Wind: 2.1 m/s
Best Night
3:00Score: 7.6/10
Waves: 0.24m, Wind: 4.8 m/s
Seasonal Analysis for TobishimaAlpha
Historical patterns and best seasons for diving at Tobishima
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 Tobishima
Winter
Avg. Score: 7.7/10
Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.
Best Months for Tobishima
January
Score: 7.8
February
Score: 7.7
December
Score: 7.6
Ideal Conditions for Tobishima
Water Temp
24.7°C / 76.5°F
August
Visibility
12.0m / 39.4ft
May
Wave Height
2.8m / 9.2ft
March
Wave Period
8.0s
January
Seasonal Insights for Tobishima
Tobishima shows typical northern hemisphere patterns with August being the warmest month (24.7°C) and January the coldest (-0.5°C). The calmest conditions typically occur in March with average wave heights of 2.8m 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). April is usually the driest month with 0.0mm 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
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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