Oyashirazu
This dive site is located on the border between Toyama and Niigata prefectures in Japan. Oshirachi Beach offers a stunning cliff backdrop overlooking the open ocean, with excellent visibility reaching up to 20 meters from June to September. Divers will encounter a diverse underwater landscape with an abundance of large roots, rocks, arches, and crevasses to explore.
Fall is a particularly exciting season as the site becomes a haven for juvenile fish. From season-changing nudibranchs to impressive 1-meter yellowtail and lobster fish, divers can delight in both macro and wide-angle photography opportunities here.
Divers have the option to either beach dive or take a boat for their underwater adventures. The Itoigawa coast, also known as the jade beach, is renowned for its jade deposits, occasionally found within the sea. During the summer, the water temperature rises to a comfortable range between 27°C to 30°C, attracting schools of fish such as yellowtail, horse mackerel, pike, bigfin reef squid, bluefin reef squid, red snapper, and carp.
This dive site near 道の駅 親不知ピアパーク in Itoigawa, Niigata Prefecture, Japan, provides an enriching experience suitable for divers of all levels, including beginners, advanced, and expert divers. With a maximum depth of 13 meters and a visibility of 10 meters, it offers a safe and captivating underwater exploration opportunity.
Fall is a particularly exciting season as the site becomes a haven for juvenile fish. From season-changing nudibranchs to impressive 1-meter yellowtail and lobster fish, divers can delight in both macro and wide-angle photography opportunities here.
Divers have the option to either beach dive or take a boat for their underwater adventures. The Itoigawa coast, also known as the jade beach, is renowned for its jade deposits, occasionally found within the sea. During the summer, the water temperature rises to a comfortable range between 27°C to 30°C, attracting schools of fish such as yellowtail, horse mackerel, pike, bigfin reef squid, bluefin reef squid, red snapper, and carp.
This dive site near 道の駅 親不知ピアパーク in Itoigawa, Niigata Prefecture, Japan, provides an enriching experience suitable for divers of all levels, including beginners, advanced, and expert divers. With a maximum depth of 13 meters and a visibility of 10 meters, it offers a safe and captivating underwater exploration opportunity.
Diving Conditions Score for Oyashirazu
6.5
Above AverageDecent conditions, proceed with caution.
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Oyashirazu
Depth
13m
Visibility
10m
Experience Level
beginner
advanced
expert
Weather Conditions for Oyashirazu
Wave Height
1.06m
Wind Speed
12.9 m/s
Water Temp
22.7°C
Visibility
12.5km
Cloud Cover
39%
Wave Period
6.8s
Air Temperature
21.2°C
Precipitation
0.1 mm
Detailed 7-Day Diving Forecast for Oyashirazu
Alpha
Dive Score Chart for Oyashirazu
Best time to dive: 13:00 with score 6.154933333333334/10. Water conditions: Waves 1.3m, Wind 14.1 m/s.Best night dive time: 23:00 with score 6.30725406824147/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Sunrise at Oyashirazu: 06:00
Sunset at Oyashirazu: 18:00
Optimal diving conditions at Oyashirazu 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
23:00Score: 6.3/10
Waves: 0.92m (6.35s), Wind: 9.7 m/s
Safest Overall
13:00Score: 6.2/10
Waves: 1.3m (7.25s), Wind: 14.1 m/s
Best Day
13:00Score: 6.2/10
Waves: 1.3m, Wind: 14.1 m/s
Seasonal Analysis for OyashirazuAlpha
Historical patterns and best seasons for diving at Oyashirazu
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 Oyashirazu
Winter
Avg. Score: 9.8/10
Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.
Best Months for Oyashirazu
January
Score: 10.0
February
Score: 9.8
December
Score: 9.7
Ideal Conditions for Oyashirazu
Water Temp
23.7°C / 74.7°F
June
Visibility
20.1m / 65.9ft
October
Wave Height
0.2m / 0.7ft
January
Wave Period
8.0s
January
Seasonal Insights for Oyashirazu
Oyashirazu shows typical northern hemisphere patterns with June being the warmest month (23.7°C) and December the coldest (19.7°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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