Best Time to Dive Tokyo (Izu Islands)
Across 2 Tokyo (Izu Islands) dive sites with multi-year conditions history, August historically shows the most favorable days — 36% of sampled days in the good band. The next-highest months are July (35%), September (34%) and June (29%). January historically shows the fewest favorable days (2% of sampled days). Average water temperature in the sample runs from about 20°C in March to 29°C in September. Typical seas range from 1.8 m to 3.0 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 (Izu Islands)?
| Month | Historically favorable days | Water temp | Typical seas |
|---|---|---|---|
| Jan | 2% | 21°C | 3.0 m |
| Feb | 3% | 20°C | 3.0 m |
| Mar | 5% | 20°C | 3.0 m |
| Apr | 7% | 21°C | 2.4 m |
| May | 15% | 22°C | 2.3 m |
| Jun | 29% | 25°C | 2.0 m |
| Jul | 35% | 28°C | 1.8 m |
| Aug | 36% | 29°C | 2.1 m |
| Sep | 34% | 29°C | 2.1 m |
| Oct | 9% | 27°C | 2.8 m |
| Nov | 8% | 25°C | 2.6 m |
| Dec | 4% | 22°C | 2.7 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.
Diving Tokyo (Izu Islands) soon? Browse its dive sites with auto-updating 7-day condition windows — free, no account needed.
Choosing between destinations? Compare them month by month with the Trip PlannerPro