Best Time to Dive Shizuoka (Izu)
Across 4 Shizuoka (Izu) dive sites with multi-year conditions history, July historically shows the most favorable days — 94% of sampled days in the good band. The next-highest months are September (93%), October (92%) and June (91%). December historically shows the fewest favorable days (76% of sampled days). Average water temperature in the sample runs from about 17°C in March to 27°C in August. Typical seas range from 1.1 m to 1.4 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 Shizuoka (Izu)?
| Month | Historically favorable days | Water temp | Typical seas |
|---|---|---|---|
| Jan | 80% | 18°C | 1.4 m |
| Feb | 78% | 17°C | 1.4 m |
| Mar | 78% | 17°C | 1.4 m |
| Apr | 87% | 18°C | 1.2 m |
| May | 84% | 19°C | 1.2 m |
| Jun | 91% | 22°C | 1.1 m |
| Jul | 94% | 25°C | 1.1 m |
| Aug | 85% | 27°C | 1.1 m |
| Sep | 93% | 27°C | 1.1 m |
| Oct | 92% | 25°C | 1.1 m |
| Nov | 79% | 22°C | 1.2 m |
| Dec | 76% | 19°C | 1.3 m |
% = share of sampled days scoring in the favorable band, median across 4 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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