Nishiumi
Nishiumi, located at the southwestern tip of Ehime Prefecture in Japan, offers a breathtaking diving experience for enthusiasts. Situated on the border with Kochi Prefecture and boasting the picturesque West Sea Peninsula, this dive site offers a variety of underwater wonders. Whether you prefer boat diving or beach dives, Nishiumi has something for everyone.
The rich marine life in Nishiumi includes semicirculated angels, red Anthias, red-headed snapper, Keramahana snapper, scorpionfish, various frogfishes, rainbow runners, and jacks. For those diving in May and June, the sight of numerous Bullshead Sharks is a thrilling experience.
The underwater landscape is adorned with magnificent Hama and table corals, as well as delicate and vibrant soft corals that have stood the test of time, some dating back over 100 years. This tropical oasis is home to a diverse array of colorful macro life, which never fails to captivate divers. Additionally, Nishiumi offers exciting dives through arches and caves, adding a touch of excitement to every exploration.
With visibility up to 11 meters and a maximum depth of 18 meters, Nishiumi is suitable for divers of all levels. Whether you are a beginner, advanced, or expert diver, you can fully enjoy all that this remarkable dive site has to offer.
Plan your dive adventure in Nishiumi, Japan, and experience the majesty of its underwater world.
The rich marine life in Nishiumi includes semicirculated angels, red Anthias, red-headed snapper, Keramahana snapper, scorpionfish, various frogfishes, rainbow runners, and jacks. For those diving in May and June, the sight of numerous Bullshead Sharks is a thrilling experience.
The underwater landscape is adorned with magnificent Hama and table corals, as well as delicate and vibrant soft corals that have stood the test of time, some dating back over 100 years. This tropical oasis is home to a diverse array of colorful macro life, which never fails to captivate divers. Additionally, Nishiumi offers exciting dives through arches and caves, adding a touch of excitement to every exploration.
With visibility up to 11 meters and a maximum depth of 18 meters, Nishiumi is suitable for divers of all levels. Whether you are a beginner, advanced, or expert diver, you can fully enjoy all that this remarkable dive site has to offer.
Plan your dive adventure in Nishiumi, Japan, and experience the majesty of its underwater world.
Diving Conditions Score for Nishiumi
6.4
Above AverageDecent conditions, proceed with caution.
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Nishiumi
Depth
18m
Visibility
11m
Experience Level
beginner
advanced
expert
Weather Conditions for Nishiumi
Wave Height
0.48m
Wind Speed
12.2 m/s
Water Temp
23.9°C
Visibility
1.38km
Cloud Cover
65%
Wave Period
8.45s
Air Temperature
20.4°C
Precipitation
0.9 mm
Detailed 7-Day Diving Forecast for Nishiumi
Alpha
Dive Score Chart for Nishiumi
Best time to dive: 8:00 with score 6.722318181818182/10. Water conditions: Waves 0.56m, Wind 23.3 m/s.Best night dive time: 5:00 with score 6.093407936507937/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Sunrise at Nishiumi: 06:00
Sunset at Nishiumi: 18:00
Optimal diving conditions at Nishiumi 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
8:00Score: 6.7/10
Waves: 0.56m (7.7s), Wind: 23.3 m/s
Best Night
5:00Score: 6.1/10
Waves: 0.5m, Wind: 9.8 m/s
Seasonal Analysis for NishiumiAlpha
Historical patterns and best seasons for diving at Nishiumi
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 Nishiumi
Winter
Avg. Score: 8.5/10
Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.
Best Months for Nishiumi
January
Score: 8.6
February
Score: 8.4
December
Score: 8.4
Ideal Conditions for Nishiumi
Water Temp
27.2°C / 81.0°F
August
Visibility
13.4m / 44.0ft
November
Wave Height
1.7m / 5.6ft
October
Wave Period
8.0s
January
Seasonal Insights for Nishiumi
Nishiumi shows typical northern hemisphere patterns with August being the warmest month (27.2°C) and February the coldest (3.8°C). The calmest conditions typically occur in October with average wave heights of 1.7m and wave periods of 8.0s. The most comfortable wave conditions are in October 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 October to December, 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 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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