Best Time to Dive Tokyo (Ogasawara)
Across 2 Tokyo (Ogasawara) dive sites with multi-year conditions history, June historically shows the most favorable days — 65% of sampled days in the good band. The next-highest months are July (61%), September (54%) and August (48%). January historically shows the fewest favorable days (2% of sampled days). Average water temperature in the sample runs from about 21°C in February to 29°C in September. Typical seas range from 1.6 m to 2.8 m of significant wave height through the year. These figures are historical climatology computed from measured conditions — patterns, not a forecast or a guarantee.
Computed from our own conditions climatology — measured history, not brochure copy.
Which months are historically most favorable in Tokyo (Ogasawara)?
| Month | Historically favorable days | Water temp | Typical seas |
|---|---|---|---|
| Jan | 2% | 21°C | 2.8 m |
| Feb | 3% | 21°C | 2.7 m |
| Mar | 20% | 21°C | 2.2 m |
| Apr | 32% | 22°C | 1.9 m |
| May | 40% | 24°C | 1.7 m |
| Jun | 65% | 27°C | 1.6 m |
| Jul | 61% | 29°C | 1.6 m |
| Aug | 48% | 29°C | 1.9 m |
| Sep | 54% | 29°C | 1.7 m |
| Oct | 13% | 28°C | 2.4 m |
| Nov | 7% | 26°C | 2.3 m |
| Dec | 5% | 24°C | 2.5 m |
% = share of sampled days scoring in the favorable band, median across 2 dive sites with at least two years of history. Ringed = historical peak.
How does this compare worldwide? The Most Reliable Diving Months on Earth ranks 61 countries by the same measure.
Marine life seasons
Sighting patterns across the wider Japan & East Asia region — not site-specific promises.
- Green sea turtleApr–Jun
Bars are Jan–Dec — months when sightings historically concentrate (GBIF occurrence records). Wildlife is never guaranteed.
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