Diving Gulf of Thailand from Singapore

Koh Tao and its neighbours run on the opposite calendar to Phuket — the gulf is at its best while the Andaman side is shut.

Islands: Ko Tao, Ko Adang, Ko Lanta Yai, Ko Mak, Ko Rawi

Best months: Mar–Aug
Also good: Jan–Feb, Sep
From Singapore: ~5h 51m each way
On the map: 46 dive sites · 22 centres

When to go

Monsoon

October is the worst of the season here.

Northeast monsoon

The gulf's wet season. Heavy rain, wind onto the east-facing sites, and visibility that drops to a few metres after a storm. Diving continues; it just stops being worth the flight.

The year here

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Best here: March, April, May, June, July, August.

Gulf of Thailand. Written by hand from how the season actually runs, calibrated against what the boats do, since a season that disagrees with the operators is wrong however good the meteorology behind it. It describes most years, not this one: the forecast above is what knows about next week.

Northeast monsoon (Oct–Dec) — The gulf's wet season. Heavy rain, wind onto the east-facing sites, and visibility that drops to a few metres after a storm. Diving continues; it just stops being worth the flight.

Where to dive in Gulf of Thailand

Ko Tao · 19 sites

Ko Adang · 8 sites

Ko Lanta Yai · 2 sites

Ko Mak · 2 sites

Ko Rawi · 2 sites

Elsewhere · 13 sites

Every site opens onto this week's sea forecast and the marine life seen there. See them on the map →

Dive centres

Run one of these? Claim your listing — it's free

Getting there from Singapore

Ko TaoFlight → Ferry → Dive boat~5h 51m
Ko AdangFlight → Transfer → Ferry → Dive boat~5h 9m
Ko Lanta YaiFlight → Transfer → Ferry → Dive boat~5h 54m
Ko MakFlight → Transfer → Ferry → Dive boat~9h 24m
Ko RawiFlight → Transfer → Ferry → Dive boat~5h 21m

~5h 51m

door to water, each way · 3 legs

FlightKoh Samui (USM)~3h 51mFlight time plus the airports at both ends. A connection adds to it.Find flights →
FerryKoh Tao1h 30mThe Lomprayah catamaran, about 90 minutes, several a day.
Dive boatAo Hin Ngam30 minChumphon Pinnacle and the rest are 20 to 45 minutes off the island.

📍 Ao Hin Ngam on Google Maps 🧭 Route from Koh Samui

Times marked ~ are estimated from straight-line distance and will be roughly right at best. The road legs are the ones Google Maps answers properly; it will not plan the ferry or the dive boat at all. A dive site's coordinates put a pin in open water, so the map link drops you on the site, not on a jetty.

Is it good right now?

The forecast for Ao Hin Ngam shows this week's swell and wind — and you can ask to be told when it looks good. Or see where to dive this month.

Planning Gulf of Thailand with friends?

Hear when a site looks goodFollow any dive site and we'll tell you when a good spell is on the forecast.
Plan trips with your groupEveryone answers going, maybe or can't, and the club calendar shows the dates most people can make.
Join a trip from the group chatTap “Count me in” on a shared trip link and you're in the club and down as going.
Keep a log bookLog your dives with the conditions you found, which become your group's reports on that site.
Your group's own spacePosts, photos and private messages, seen by members only.
Add missing dive sitesPut a site the map doesn't have yet where the boat actually goes.

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