When To Go · Destination Guide
Ogasawara Islands
Bonin-blue reefs, careful wildlife encounters and two islands reached by sea.
When To Go · Destination Guide
Bonin-blue reefs, careful wildlife encounters and two islands reached by sea.
When to go
For snorkeling comfort and mixed boat activities, prioritize June-October while keeping a typhoon contingency.
Best overall window
The usual base is Chichijima.
Outside that window
Storm Disruptions.
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: Good | Overall - Feb: Tradeoffs | Overall - Mar: Tradeoffs | Overall - Apr: Tradeoffs | Overall - May: Tradeoffs | Overall - Jun: Best | Overall - Jul: Best | Overall - Aug: Good | Overall - Sep: Best | Overall - Oct: Best | 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 watching
Best for Topside
Dec to May
Humpbacks are seasonal in island waters, with February-March often favored for watching.
Hahajima spring dogtooth tuna
Best for Scuba
Mar to Jun
Dive Resort Hahajima documents an operator-led spring/early-summer concentration around Yonhon Iwa and nearby routes.
Green sea turtle nesting
Best for Topside, Snorkel
May to Aug
Female green turtles may visit beaches at night during nesting season.
Dolphins in offshore waters
Best for Snorkel, Topside
Year-round
Resident dolphin species may be encountered throughout the year on locally guided boat trips.
Autumn Hahajima ray activity
Best for Scuba
Sep to Nov
A Hahajima dive operator highlights late-season eagle-ray and cownose-ray opportunities; these are non-guaranteed sightings at operator-approved sites.
Offshore sperm whale watching
Best for Topside
Jun to Nov
Summer-autumn is a typical advertised offshore watching window, conditional on boat and sea conditions; sperm whales can be present outside this window too.
Built from climate references, access rules, and destination operators. Wildlife timing and route flexibility can shift year to year.