Akaiwa
Sado Island, located in Japan, is the second-largest island in terms of area, surpassed only by the main island of Okinawa. It can be easily accessed by a 2.5-hour ferry ride from Niigata Port or a 1-hour jetfoil journey. During the summer season, divers are drawn to the calm and crystal-clear waters, with warm temperatures, making it an immensely popular destination.
Divers exploring the waters around Sado Island will encounter a rich variety of marine life. You can marvel at the sight of big lobsters, schools of horse mackerel, vibrant anemones, fascinating nudibranchs, and various other captivating species. In the winter months, large ostriches even make an appearance for spawning.
For a convenient diving experience, Kita Koura offers a unique diving rest area set within a disused elementary school. Just a quick 5-minute boat ride from the nearby harbor, Akaiwa is a well-loved diving spot on Sado Island. Here, divers can delve into the depths of the water, exploring a large rock formation located on a sandy beach at a maximum depth of 23 meters. The shallower parts of the water boast a depth of around 14 meters, perfect for divers at both beginner and advanced levels.
With its ideal location and breathtaking underwater landscapes, Sado Island's dive sites are sure to captivate divers of all skill levels. Plan your visit to this stunning Japanese island and immerse yourself in the beauty that lies beneath its waters.
Divers exploring the waters around Sado Island will encounter a rich variety of marine life. You can marvel at the sight of big lobsters, schools of horse mackerel, vibrant anemones, fascinating nudibranchs, and various other captivating species. In the winter months, large ostriches even make an appearance for spawning.
For a convenient diving experience, Kita Koura offers a unique diving rest area set within a disused elementary school. Just a quick 5-minute boat ride from the nearby harbor, Akaiwa is a well-loved diving spot on Sado Island. Here, divers can delve into the depths of the water, exploring a large rock formation located on a sandy beach at a maximum depth of 23 meters. The shallower parts of the water boast a depth of around 14 meters, perfect for divers at both beginner and advanced levels.
With its ideal location and breathtaking underwater landscapes, Sado Island's dive sites are sure to captivate divers of all skill levels. Plan your visit to this stunning Japanese island and immerse yourself in the beauty that lies beneath its waters.
Diving Conditions Score for Akaiwa
5.1
AverageAverage conditions, be alert.
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Akaiwa
Depth
23m
Visibility
14m
Experience Level
beginner
advanced
Weather Conditions for Akaiwa
Wave Height
2.48m
Wind Speed
23.6 m/s
Water Temp
21.8°C
Visibility
5.44km
Cloud Cover
95%
Wave Period
6.45s
Air Temperature
20.1°C
Precipitation
0 mm
Detailed 7-Day Diving Forecast for Akaiwa
Alpha
Dive Score Chart for Akaiwa
Best time to dive: 16:00 with score 5.642766666666667/10. Water conditions: Waves 1.6m, Wind 16.8 m/s.Best night dive time: 23:00 with score 6.020199999999999/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Sunrise at Akaiwa: 06:00
Sunset at Akaiwa: 18:00
Optimal diving conditions at Akaiwa 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: 6.0/10
Waves: 0.96m (5.5s), Wind: 15.9 m/s
Safest Overall
17:00Score: 5.6/10
Waves: 1.48m (5.85s), Wind: 16.2 m/s
Best Day
16:00Score: 5.6/10
Waves: 1.6m, Wind: 16.8 m/s
Seasonal Analysis for AkaiwaAlpha
Historical patterns and best seasons for diving at Akaiwa
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 Akaiwa
Winter
Avg. Score: 7.7/10
Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.
Best Months for Akaiwa
January
Score: 7.9
February
Score: 7.7
December
Score: 7.6
Ideal Conditions for Akaiwa
Water Temp
25.0°C / 77.0°F
July
Visibility
13.4m / 44.0ft
May
Wave Height
1.6m / 5.2ft
March
Wave Period
8.0s
January
Seasonal Insights for Akaiwa
Akaiwa shows typical northern hemisphere patterns with July being the warmest month (25.0°C) and January the coldest (-1.2°C). The calmest conditions typically occur in March with average wave heights of 1.6m and wave periods of 8.0s. The most comfortable wave conditions are in March 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 March to May, 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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