Ogan
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
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
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
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.
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.
Score: 6.2/10
Waves: 1.72m (7.05s), Wind: 7 m/s
Score: 6.1/10
Waves: 1.66m, Wind: 1.5 m/s
Seasonal Analysis for OganAlpha
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
Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.
Best Months for Ogan
Ideal Conditions for Ogan
Water Temp
25.7°C / 78.3°F
September
Visibility
11.9m / 39.0ft
July
Wave Height
2.8m / 9.2ft
March
Wave Period
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.
Last updated: 1 min. ago - Jun 26, 2026