Shiretoko
This remarkable dive site offers a variety of fascinating marine life, including the shellless clam, known as the Hadaka Kamegai or kurione, and its main food source, the swimming clam, called Mizin-Uki-Mai. Despite the below freezing water temperatures, the area is teeming with abundant marine species like crabs, shrimps, nudibranchs, and anemones.
In the western part of the Shiretoko Peninsula, Utoro experiences the arrival of drift ice as early as the end of January. Diving here predominantly involves creating an opening in the densely-packed ice near the shore. With water temperatures ranging between -1 and -2 degrees Celsius, visibility reaches around 10 meters with a depth of approximately 10 meters. As this is a complete ice dive, it is crucial to possess the necessary equipment and skills. The Shiretoko Peninsula is a designated World Natural Heritage site, boasting a unique natural environment both above and below the water's surface. Thorough preparation is essential for this extraordinary dive, including acquiring the appropriate training and equipment.
##### Location Details:
- Country: Japan
- Close Location: National Highway Route 334, Utoro-higashi, Utoro, Shari, Shari County, Okhotsk Subprefecture, Hokkaido Prefecture, 099-4352, Japan.
Diving Conditions Score for Shiretoko
Decent conditions, proceed with caution.
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Shiretoko
Experience Level
Weather Conditions for Shiretoko
Wave Height
0.72m
Wind Speed
10 m/s
Water Temp
10°C
Visibility
15km
Cloud Cover
57.5%
Wave Period
6.45s
Air Temperature
20°C
Precipitation
0 mm
Dive Score Chart for Shiretoko
Best time to dive: 6:00 with score 7.626666666666667/10. Water conditions: Waves 0.72m, Wind 10 m/s.Best night dive time: 0:00 with score 7.126666666666667/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Optimal diving conditions at Shiretoko 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.
Score: 7.6/10
Waves: 0.72m (8s), Wind: 10 m/s
Score: 7.1/10
Waves: 0.72m, Wind: 10 m/s
Seasonal Analysis for ShiretokoAlpha
Historical patterns and best seasons for diving at Shiretoko
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 Shiretoko
Winter
Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.
Best Months for Shiretoko
Ideal Conditions for Shiretoko
Water Temp
19.2°C / 66.6°F
July
Visibility
13.6m / 44.6ft
March
Wave Height
1.0m / 3.3ft
February
Wave Period
8.0s
January
Seasonal Insights for Shiretoko
Shiretoko shows typical northern hemisphere patterns with July being the warmest month (19.2°C) and January the coldest (-8.3°C). The calmest conditions typically occur in February with average wave heights of 1.0m and wave periods of 8.0s. The most comfortable wave conditions are in February 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 0.2mm of precipitation. For beginners, the best time to visit would be during February to April, 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 4, 2026