Best Time to Dive Sri Lanka
Across 9 Sri Lanka dive sites with multi-year conditions history, April historically shows the most favorable days — 100% of sampled days in the good band. The next-highest months are March (99%), October (99%) and August (91%). January historically shows the fewest favorable days (77% of sampled days). Average water temperature in the sample runs from about 28°C in January to 30°C in April. Typical seas range from 0.8 m to 1.2 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 Sri Lanka?
| Month | Historically favorable days | Water temp | Typical seas |
|---|---|---|---|
| Jan | 77% | 28°C | 1.2 m |
| Feb | 89% | 28°C | 1.0 m |
| Mar | 99% | 29°C | 0.8 m |
| Apr | 100% | 30°C | 0.8 m |
| May | 84% | 30°C | 1.0 m |
| Jun | 89% | 29°C | 1.2 m |
| Jul | 81% | 29°C | 1.2 m |
| Aug | 91% | 29°C | 1.1 m |
| Sep | 89% | 29°C | 1.1 m |
| Oct | 99% | 29°C | 0.9 m |
| Nov | 88% | 29°C | 1.0 m |
| Dec | 88% | 28°C | 1.1 m |
% = share of sampled days scoring in the favorable band, median across 9 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 Maldives & Sri Lanka region — not site-specific promises.
- Whale sharkDecember
- Green sea turtleJan–Mar
Bars are Jan–Dec — months when sightings historically concentrate (GBIF occurrence records). Wildlife is never guaranteed.
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