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Akiu Big Fall

Located just an hour away from Sendai, Japan, Akiu Ootaki offers an extraordinary diving experience in one of the world's rarest waterfall basins. Cascading from a height of 55 meters, this dive site allows you to immerse yourself beneath the thundering waterfall, surrounded by the invigorating vibrations of falling water.

Although the surrounding area is predominately freshwater with limited marine life, divers can still observe fascinating species such as char, rockfish, trout, white-tailed bream, and even swordfish. Don't be surprised if you come across some cherry salmon or spot other curious creatures like frogs during your dive.

The waterfall itself boasts a maximum diameter of 15 to 20 meters, providing ample room for exploration. With a maximum depth of 8 meters and a few small horizontal openings in the water, this site caters to both beginner and advanced divers alike. It's important to note that during the winter months, the water temperature can drop below freezing due to the influence of snowmelt.

For those seeking an unforgettable diving adventure, Akiu Ootaki in Taihaku Ward, Sendai, Miyagi Prefecture, Japan, is a must-visit destination. Whether you're a novice or an experienced diver, this unique waterfall dive promises an exhilarating experience unlike any other.

Diving Conditions Score for Akiu Big Fall

4.9
Below Average

Challenging conditions, for experienced divers only.
The score is based on a calculation of the current weather and sea conditions.

Dive Site Overview for Akiu Big Fall

Experience Level

beginner
advanced

Weather Conditions for Akiu Big Fall

Wave Height

1m

Wind Speed

4.7 m/s

Water Temp

18°C

Visibility

3.6km

Cloud Cover

98%

Wave Period

8s

Air Temperature

14.3°C

Precipitation

0.8 mm

Detailed 7-Day Diving Forecast for Akiu Big Fall
Alpha

Dive Score Chart for Akiu Big Fall

Best time to dive: 17:00 with score 5.951233333333333/10. Water conditions: Waves 1m, Wind 4.7 m/s.Best night dive time: 1:00 with score 5.966133333333334/10.

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

Sunrise at Akiu Big Fall: 06:00
Sunset at Akiu Big Fall: 18:00

Optimal diving conditions at Akiu Big Fall 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
1:00

Score: 6.0/10
Waves: 1m (8s), Wind: 2.9 m/s

🌞
Safest Overall
17:00

Score: 6.0/10
Waves: 1m (8s), Wind: 4.7 m/s

🌞
Best Day
17:00

Score: 6.0/10
Waves: 1m, Wind: 4.7 m/s

Seasonal Analysis for Akiu Big Fall
Alpha

Historical patterns and best seasons for diving at Akiu Big Fall

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 Akiu Big Fall

Winter

Avg. Score: 9.9/10

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

Best Months for Akiu Big Fall

January
Score: 10.0
February
Score: 9.8
December
Score: 9.8

Ideal Conditions for Akiu Big Fall

Water Temp

Thermometer Emoji

23.8°C / 74.8°F

June

Visibility

Telescope Emoji

20.1m / 65.9ft

October

Wave Height

Wave Emoji

0.2m / 0.7ft

January

Wave Period

Wave Emoji

8.0s

January

Seasonal Insights for Akiu Big Fall

Akiu Big Fall shows typical northern hemisphere patterns with June being the warmest month (23.8°C) and December the coldest (19.8°C). The calmest conditions typically occur in January with average wave heights of 0.2m 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). January 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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