Zenisu
Senzu, located 36 km southwest of Jinzu Island in the Izu Seven Islands, is a captivating dive site in Japan. Consisting of three reefs, reaching Senzu requires a one and a half hour journey from Jinzu Island, a three and a half to four hour journey from Shimoda, or a five hour journey from Nishi-Izu via a charter boat.
Prepare to be astounded by the abundance of marine life at Senzu. This underwater wonderland is teeming with a diverse array of fish species. In awe-inspiring schools, large migratory fish make their presence known, while butterflyfish flourish in substantial numbers. Experience the sheer power and thrill as sharks, green sea turtles, mackerel, hawks, and even whales pursue their prey in magnificent formations.
At Senzu, each dive is tailored to suit the prevailing conditions, including currents, waves, wind, and the skill level of the divers. This unique site, renowned for its challenging access and strong currents, is best suited for advanced divers seeking an exhilarating adventure.
Prepare to be astounded by the abundance of marine life at Senzu. This underwater wonderland is teeming with a diverse array of fish species. In awe-inspiring schools, large migratory fish make their presence known, while butterflyfish flourish in substantial numbers. Experience the sheer power and thrill as sharks, green sea turtles, mackerel, hawks, and even whales pursue their prey in magnificent formations.
At Senzu, each dive is tailored to suit the prevailing conditions, including currents, waves, wind, and the skill level of the divers. This unique site, renowned for its challenging access and strong currents, is best suited for advanced divers seeking an exhilarating adventure.
Diving Conditions Score for Zenisu
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 Zenisu
Experience Level
expert
Weather Conditions for Zenisu
Wave Height
1.8m
Wind Speed
33.7 m/s
Water Temp
25.6°C
Visibility
14.46km
Cloud Cover
62%
Wave Period
6.85s
Air Temperature
23.6°C
Precipitation
0 mm
Detailed 7-Day Diving Forecast for Zenisu
Alpha
Dive Score Chart for Zenisu
Best time to dive: 6:00 with score 5.7635/10. Water conditions: Waves 1.7m, Wind 28.4 m/s.Best night dive time: 1:00 with score 5.4277999999999995/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Sunrise at Zenisu: 06:00
Sunset at Zenisu: 18:00
Optimal diving conditions at Zenisu 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
6:00Score: 5.8/10
Waves: 1.7m (7.6s), Wind: 28.4 m/s
Best Night
1:00Score: 5.4/10
Waves: 1.6m, Wind: 23.8 m/s
Seasonal Analysis for ZenisuAlpha
Historical patterns and best seasons for diving at Zenisu
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 Zenisu
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 Zenisu
January
Score: 8.5
December
Score: 8.4
February
Score: 8.3
Ideal Conditions for Zenisu
Water Temp
27.2°C / 81.0°F
August
Visibility
11.7m / 38.4ft
June
Wave Height
3.9m / 12.8ft
May
Wave Period
8.0s
January
Seasonal Insights for Zenisu
Zenisu shows typical northern hemisphere patterns with August being the warmest month (27.2°C) and January the coldest (7.5°C). The calmest conditions typically occur in May with average wave heights of 3.9m and wave periods of 8.0s. The most comfortable wave conditions are in May 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). June is usually the driest month with 0.4mm of precipitation. For beginners, the best time to visit would be during May to July, 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 17, 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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