Planning a trip?
Hotels, dive operators, gear, and how to get here are on the Similan Islands location page.
Overview
Massive granite boulders forming swim-throughs, canyons and arches between islands 7 and 8. Topography is the draw rather than corals — sun beams cut through the gaps and big schools of fusiliers stream by.
Briefing note
Marine park closed mid-May to mid-October during southwest monsoon.
What you'll see
4 species curated- seasonalLeopard shark
- year-roundSchooling fusilier
- year-roundNapoleon wrasse
- year-roundOctopus
Sightings evidence
1 record on file- medium confidenceLeopard shark
- Last confirmed
- Apr 2026
- Recent records
- 45 within 10 km
Sources & methodology
How we summarise this
We aggregate confirmed occurrence records from GBIF and OBIS within a fixed radius of each dive site. Occurrence records confirm presence and reveal seasonality clustering, but they DO NOT measure per-dive probability — there is no eligible-effort denominator. We deliberately do not publish a numeric '% chance of sighting' from this data.
Sources
- Global Biodiversity Information Facility — GBIF Secretariat
- Ocean Biodiversity Information System — IOC-UNESCO
- iNaturalist — California Academy of Sciences & National Geographic Society
- IUCN Red List of Threatened Species — International Union for Conservation of Nature
- Wildbook (Sharkbook, Whale Shark, Manta Matcher) — Wild Me
- OBIS-SEAMAP — Duke University Marine Geospatial Ecology Lab / OBIS
- WoRMS — World Register of Marine Species — Flanders Marine Institute (VLIZ)
- FishBase — FishBase Consortium
- Atlas of Living Australia — CSIRO / GBIF Australia
- REEF Volunteer Fish Survey — Reef Environmental Education Foundation
Conditions
| Month | Water | Visibility | Current |
|---|---|---|---|
| Jan | 27–29 °C | 20–30 m | moderate |
| Feb | 27–29 °C | 20–30 m | moderate |
| Mar | 28–30 °C | 25–35 m | moderate |
| Apr | 28–30 °C | 25–35 m | moderate |
| May | 28–30 °C | 15–25 m | moderate |
| Jun | 28–30 °C | 10–20 m | strong |
| Jul | 27–29 °C | 10–20 m | strong |
| Aug | 27–29 °C | 10–20 m | strong |
| Sep | 27–29 °C | 10–20 m | strong |
| Oct | 27–29 °C | 15–25 m | moderate |
| Nov | 28–30 °C | 20–30 m | moderate |
| Dec | 27–29 °C | 20–30 m | moderate |
Season calendar
Peak season highlighted · current month outlined
Gear for this site
Beyond the basic kit- Dive light — Granite swim-throughs are dark in the middle sections.
- SMB — Currents can sweep you off the formation; surface drift exit common.
Next step
Book your trip to Similan Islands
Hotels, liveaboards, dive operators, gear recommendations, and travel logistics for the whole region.
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