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Nishikawana

Located at the tip of Tateyama on the Boso Peninsula in Japan, this dive site offers a unique underwater experience. It is accessible only by boat diving, with a maximum depth of 25m and an average depth of 15-16m. Divers can explore a mixture of rocky reefs, gorota stones, and sandy terrain. However, caution is required as the flow of water can be fast at times.

One of the main attractions of this dive site is the V-shaped valley that surrounds it. Here, divers can encounter an array of marine life, including large fish such as Kue, schools of sunfish, and damselfish. In the summer, it is also common to come across schools of stingrays. Moreover, a massive black sea eel has made this site its home, allowing divers to observe it up close. Additionally, during the summer months, there are frequent encounters with schools of large migratory fish that follow smaller fish.

Due to occasional strong currents, divers are advised to possess advanced or expert diving skills. Ropes and chains have been installed on the seabed to aid in maintaining a steady position when the current is steep. The focal point of the dive is the roots of the V-shaped valley, which attracts an abundance of fish. Notably, Nishikawana is renowned for its above-average-sized marine inhabitants, including groupers that can exceed a length of 1 meter.

With a visibility of 14m and a maximum depth of 20m, this dive site in Nishikawana, Tateyama, Chiba Prefecture, Japan is a destination not to be missed by experienced divers seeking an extraordinary underwater adventure.

Diving Conditions Score for Nishikawana

7
Good

Good diving conditions!
The score is based on a calculation of the current weather and sea conditions.

Dive Site Overview for Nishikawana

Depth

20m

Visibility

14m

Experience Level

advanced
expert

Weather Conditions for Nishikawana

Wave Height

1.08m

Wind Speed

16.7 m/s

Water Temp

23.5°C

Visibility

26.4km

Cloud Cover

56%

Wave Period

8.55s

Air Temperature

21.6°C

Precipitation

0 mm

Detailed 7-Day Diving Forecast for Nishikawana
Alpha

Dive Score Chart for Nishikawana

Best time to dive: 6:00 with score 6.9852662721893495/10. Water conditions: Waves 1.02m, Wind 8 m/s.Best night dive time: 3:00 with score 7.0537547325102885/10.

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

Sunrise at Nishikawana: 06:00
Sunset at Nishikawana: 18:00

Optimal diving conditions at Nishikawana 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
3:00

Score: 7.1/10
Waves: 1m (8.1s), Wind: 2.8 m/s

🌞
Safest Overall
6:00

Score: 7.0/10
Waves: 1.02m (8.45s), Wind: 8 m/s

🌞
Best Day
6:00

Score: 7.0/10
Waves: 1.02m, Wind: 8 m/s

Seasonal Analysis for Nishikawana
Alpha

Historical patterns and best seasons for diving at Nishikawana

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 Nishikawana

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 Nishikawana

January
Score: 8.5
December
Score: 8.4
February
Score: 8.3

Ideal Conditions for Nishikawana

Water Temp

Thermometer Emoji

25.6°C / 78.1°F

August

Visibility

Telescope Emoji

12.0m / 39.4ft

October

Wave Height

Wave Emoji

2.0m / 6.6ft

November

Wave Period

Wave Emoji

8.0s

January

Seasonal Insights for Nishikawana

Nishikawana shows typical northern hemisphere patterns with August being the warmest month (25.6°C) and January the coldest (3.3°C). The calmest conditions typically occur in November with average wave heights of 2.0m and wave periods of 8.0s. The most comfortable wave conditions are in November 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 November to January, 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 23, 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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