Mirissa sits on Sri Lanka's south coast, with sites spread across Indian Ocean reefs from shallow shore entries to deeper boat dives. Water stays warm year-round, peaking in April and dropping only slightly in mid-year. The seven sites in the area range from the shallow, beginner-friendly Polhena Reef to the deeper Moray Point ridge and Dispa Rock, giving divers a spread of options. Reef life includes green sea turtles, blacktip reef sharks, nudibranchs, Napoleon wrasse, and occasional whale sharks. Visibility can be affected by plankton but reaches up to thirty metres on good days. The best conditions fall between November and April when seas calm.
Monthly water temperature across Mirissa's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water temperature is warm throughout the year, with the peak in April and the lowest readings in July and August, still comfortable without a thick wetsuit. The November-to-April window brings the calmest seas and the most reliable visibility, while plankton blooms at other times can reduce sightlines considerably.
Water temperature around Mirissa ranges from about 28°C in January to 30°C in April, based on satellite sea-temperature data for its dive sites.
With water around 28–30°C, a rash guard or 3mm shorty works in Mirissa year-round.
Fin maps 7 sites in Mirissa (7 scuba diving sites).
Across Mirissa's dive sites, January, February, March, April, November and December are most often reported as the best months to visit.
2 more sites to explore
