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Horomui

Dive into the enchanting waters of Cape Shakotan, a stunning underwater park located at the northernmost tip of Shakotan in northwestern Hokkaido, Japan. This picturesque cape, listed among Japan's top 100 sandy beaches, promises a captivating diving experience.

During September, keep an eye out for the majestic tuna swimming gracefully through the waters. From around June, prepare to be awe-struck by the sight of massive schools of headliners and bowhead whales, measuring up to an incredible 12 to 30 meters in length. And if you visit in April, you might be lucky enough to witness the movement of killer whales, showcasing their vibrant presence in schools.

Cape Shakotan is a magnet for passionate divers fascinated by its crystal-clear waters, intriguing rock formations, and unique columnar arthroids. However, the true highlight lies in the extraordinary opportunity to dive alongside wild sea lions. From mid-December to May, these charismatic creatures grace the waters around Cape Makka, located on the right-hand side of Horobui's harbor. Brace yourself for an exhilarating diving encounter as the sea lions gracefully approach within a few meters of your presence.

With impeccable visibility and a maximum depth of 0 meters, Cape Shakotan offers an unparalleled experience for advanced and expert divers. Explore the underwater wonders of this remarkable dive site, situated in the captivating Shakotan County, Shiribeshi Subprefecture, Hokkaido Prefecture, Japan.

Discover the allure of Cape Shakotan, an exceptional diving destination that promises unforgettable adventures beneath the waves.

Diving Conditions Score for Horomui

5.3
Average

Average conditions, be alert.
The score is based on a calculation of the current weather and sea conditions.

Dive Site Overview for Horomui

Experience Level

advanced
expert

Weather Conditions for Horomui

Wave Height

0.74m

Wind Speed

10.6 m/s

Water Temp

16.9°C

Visibility

36.42km

Cloud Cover

100%

Wave Period

5.35s

Air Temperature

14.8°C

Precipitation

0 mm

Detailed 7-Day Diving Forecast for Horomui
Alpha

Dive Score Chart for Horomui

Best time to dive: 10:00 with score 7.3794272727272725/10. Water conditions: Waves 0.66m, Wind 6.4 m/s.Best night dive time: 0:00 with score 7.049148418491484/10.

Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.

Sunrise at Horomui: 06:00
Sunset at Horomui: 18:00

Optimal diving conditions at Horomui 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
10:00

Score: 7.4/10
Waves: 0.66m (6.05s), Wind: 6.4 m/s

🌙
Best Night
0:00

Score: 7.0/10
Waves: 0.84m, Wind: 3.3 m/s

Seasonal Analysis for Horomui
Alpha

Historical patterns and best seasons for diving at Horomui

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 Horomui

Winter

Avg. Score: 7.9/10

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

Best Months for Horomui

January
Score: 8.1
February
Score: 7.8
December
Score: 7.7

Ideal Conditions for Horomui

Water Temp

Thermometer Emoji

21.0°C / 69.8°F

August

Visibility

Telescope Emoji

12.0m / 39.4ft

September

Wave Height

Wave Emoji

1.4m / 4.6ft

January

Wave Period

Wave Emoji

8.0s

January

Seasonal Insights for Horomui

Horomui shows typical northern hemisphere patterns with August being the warmest month (21.0°C) and January the coldest (-6.1°C). The calmest conditions typically occur in January with average wave heights of 1.4m 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). April 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.

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

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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