Best Time to Dive Cozumel
Across 33 Cozumel dive sites with multi-year conditions history, May, August, November and December historically show the most favorable days — 100% of sampled days in the good band.
Computed from our own conditions climatology — measured history, not brochure copy. Historical patterns, never a forecast or a guarantee.
Month by month
| Month | Historically favorable days | Water temp | Typical seas |
|---|---|---|---|
| Jan | 99% | 27°C | 0.8 m |
| Feb | 95% | 27°C | 0.7 m |
| Mar | 97% | 27°C | 0.8 m |
| Apr | 99% | 28°C | 0.8 m |
| May | 100% | 29°C | 0.6 m |
| Jun | 97% | 30°C | 0.7 m |
| Jul | 99% | 30°C | 0.6 m |
| Aug | 100% | 30°C | 0.4 m |
| Sep | 99% | 30°C | 0.4 m |
| Oct | 98% | 30°C | 0.6 m |
| Nov | 100% | 29°C | 0.6 m |
| Dec | 100% | 28°C | 0.7 m |
% = share of sampled days scoring in the favorable band, median across 33 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 Gulf of Mexico region — not site-specific promises.
- Giant oceanic manta rayOctober
- Green sea turtleMar–May
- Bull sharkMay–Jun
Bars are Jan–Dec — months when sightings historically concentrate (GBIF occurrence records). Wildlife is never guaranteed.
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