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Shiretoko

The Shiretoko Peninsula in Japan is renowned as the ultimate destination for ice diving. Unlike other frozen lakes, divers have the unique opportunity to explore the rare drift ice, making this site truly exceptional. From January to March each year, the freezing freshwater from Russia's Amur River is carried by the wind to the Shiretoko Peninsula.

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

6.1
Above Average

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

advanced
expert

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

Detailed 7-Day Diving Forecast for Shiretoko
Alpha

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.

Sunrise at Shiretoko: 06:00
Sunset at Shiretoko: 18:00

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.

🌞
Best Overall
6:00

Score: 7.6/10
Waves: 0.72m (8s), Wind: 10 m/s

🌙
Best Night
0:00

Score: 7.1/10
Waves: 0.72m, Wind: 10 m/s

Seasonal Analysis for Shiretoko
Alpha

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

Avg. Score: 8.1/10

Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.

Best Months for Shiretoko

February
Score: 8.3
January
Score: 8.2
March
Score: 7.7

Ideal Conditions for Shiretoko

Water Temp

Thermometer Emoji

19.2°C / 66.6°F

July

Visibility

Telescope Emoji

13.6m / 44.6ft

March

Wave Height

Wave Emoji

1.0m / 3.3ft

February

Wave Period

Wave Emoji

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.

Scoring Legend:
9-10 (Excellent)
7-8 (Good)
5-6 (Average)
3-4 (Poor)
1-2 (Dangerous)

Last updated: 1 min. ago - Jun 4, 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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