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Ogan

Discover the untouched beauty of Ogan, an uninhabited island located approximately 15km southwest from the southern tip of Iriomote Island in Japan's Okinawa Prefecture. Boasting a vibrant marine ecosystem, this dive site offers an exhilarating experience for expert divers.

The renowned "Eastern Root" awaits beneath the waves, captivating divers with its awe-inspiring underwater terrain. Immerse yourself in the depths, where massive hidden roots emerge from the seabed at a depth of 40 meters. Please note that due to the strong current, this site is suitable only for advanced divers.

Prepare to be mesmerized by the abundance of marine life that thrives in these crystal-clear waters. Encounter blue tuna, red snapper, hawks, bluefish, yellowtail, bluefin tuna, bluefin trevally, Napoleon fish, and blackfin barracuda gracefully navigating their underwater realm. Keep an eye out for magnificent whale sharks, a rare sight that has been witnessed in the area.

As you venture deeper, anchoring yourself to the pinnacle of a root, you'll witness the arrival of majestic migratory fish. Among them, schools of impressive bluefin tuna measuring up to 1.5 meters showcase their natural splendor. Explore the surrounding areas of Ogan Island, which encompass a sandy point and a captivating cave point, granting divers even more opportunities to delve into the wonders below the surface.

With a visibility of 26m and a maximum depth of 19m, this extraordinary dive site guarantees an unforgettable experience for seasoned divers. Located near Taketomi in the Yaeyama region of Japan's Okinawa Prefecture, Ogan Island is waiting to astonish you with its underwater treasures.

Diving Conditions Score for Ogan

5.7
Average

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

Dive Site Overview for Ogan

Depth

19m

Visibility

26m

Experience Level

expert

Weather Conditions for Ogan

Wave Height

1.86m

Wind Speed

20.5 m/s

Water Temp

30.4°C

Visibility

4.16km

Cloud Cover

93%

Wave Period

7s

Air Temperature

27°C

Precipitation

0.7 mm

Detailed 7-Day Diving Forecast for Ogan
Alpha

Dive Score Chart for Ogan

Best time to dive: 17:00 with score 6.178733333333334/10. Water conditions: Waves 1.72m, Wind 7 m/s.Best night dive time: 20:00 with score 6.0600000000000005/10.

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

Sunrise at Ogan: 06:00
Sunset at Ogan: 18:00

Optimal diving conditions at Ogan 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
17:00

Score: 6.2/10
Waves: 1.72m (7.05s), Wind: 7 m/s

🌙
Best Night
20:00

Score: 6.1/10
Waves: 1.66m, Wind: 1.5 m/s

Seasonal Analysis for Ogan
Alpha

Historical patterns and best seasons for diving at Ogan

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 Ogan

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 Ogan

January
Score: 8.5
November
Score: 8.5
March
Score: 8.4

Ideal Conditions for Ogan

Water Temp

Thermometer Emoji

25.7°C / 78.3°F

September

Visibility

Telescope Emoji

11.9m / 39.0ft

July

Wave Height

Wave Emoji

2.8m / 9.2ft

March

Wave Period

Wave Emoji

8.0s

January

Seasonal Insights for Ogan

Ogan shows typical northern hemisphere patterns with July being the warmest month (29.2°C) and January the coldest (16.9°C). The calmest conditions typically occur in March with average wave heights of 2.8m 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). July is usually the driest month with 0.1mm 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.

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

Last updated: 1 min. ago - Jun 26, 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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