When To Go · Destination Guide
Amami Oshima
Coral bays, rare macro life and World Heritage forest, with a separate Kakeroma boat-and-ferry circuit.
When To Go · Destination Guide
Coral bays, rare macro life and World Heritage forest, with a separate Kakeroma boat-and-ferry circuit.
When to go
For warm-water snorkeling and general marine travel, July through early October is a practical starting window, not a forecast of calm seas.
Best overall window
May-June Baiu, JMA July-October typhoon risk, and changing north versus south dive-site exposures should override any simple peak-season score.
Outside that window
Amami Baiu rains normally peak in this period; water activity can continue when the guide selects acceptable conditions.
Start with the overall answer, then switch only when scuba, freedive, snorkel, or topside timing changes the trip in a meaningful way.
The overall row stays visible so you can compare it against the currently selected scope.
| Scope | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall | Overall - Jan: Best | Overall - Feb: Best | Overall - Mar: Best | Overall - Apr: Good | Overall - May: More variable | Overall - Jun: More variable | Overall - Jul: More variable | Overall - Aug: More variable | Overall - Sep: More variable | Overall - Oct: More variable | Overall - Nov: Good | Overall - Dec: Good |
These do not replace the overall planner. Use them only if a specific animal or event is driving your trip dates.
Humpback whale migration and surface watching
Best for Snorkel, Topside
Jan to Mar
Amami whale operators run winter whale watching and restricted surface-only snorkel swims.
Amami hoshizora pufferfish nesting circles
Best for Scuba
Apr to Aug
Tatsugo municipal information lists seasonal spawning structures around Ashitoku from April to August; guides may know current sites, which are not guaranteed or open for independent interference.
Nudibranch macro focus
Best for Scuba
Jan to May
LeapScubaAmami reports stronger nudibranch opportunities in cool-water seasons, especially Tebiro and sheltered north sites.
Irregular sperm whale search outings
Best for Snorkel, Topside
Apr to Sep
Kohollo advertises wind-dependent sperm whale excursions during April-September; availability, sightings and any permitted in-water activity must be confirmed with that operator.
Resident Indo-Pacific bottlenose dolphins
Best for Snorkel
Check current season
The Whale and Dolphin Association monitors a local dolphin population; Kohollo lists irregular dolphin swim trips with a coral snorkel fallback.
Summer beach-nesting sea turtles
Best for Topside
Jun to Aug
Amami tourism notes turtle nesting at Ohama Seaside Park in summer; observe from a respectful distance and never disturb nesting adults, eggs or hatchlings.
Built from climate references, access rules, and destination operators. Wildlife timing and route flexibility can shift year to year.