Diving Thailand in June: Where It Works, Where It Doesn't

Featured image: gilichupak, CC BY-SA 2.0, via Flickr.

Is June a good month to dive Thailand? The short answer

June is a split month. Gulf of Thailand diving sits in its good window, and PADI describes Gulf visibility as incredible from May through September. Andaman Sea diving is best from October through April, so June falls in the wet season there. Park closing and opening dates are set by Thailand's Department of National Parks, and they change by year. Treat the table below as a starting verdict, not a guarantee.

June conditions by coast

Thailand's tropical position keeps water near 84°F (29°C) year-round, according to PADI. Air temperatures run 85–95°F (30–35°C). Our water temperature by month page covers the seasonal detail. Temperature is rarely the issue in June. Sea state is. On the Andaman side, monsoon swell and rain make boat transfers rougher and cancellations more likely. Gulf diving in the same month tends to be calmer, which is why most June trips are based there.

Why guides disagree: marine park closures and the June gap

Some guides say the Andaman works in June. Others say go to the Gulf. Both can be right, because park status drives the answer. Historically, the national marine parks on Thailand's west coast closed on May 15 each year. In 2024, one liveaboard operator reported that Mu Koh Lanta Marine Park stayed open until the end of June. That extension changed which South Andaman sites were reachable that month. Dates are set year by year, so a 2024 example does not predict this June. Check the current notices from the national parks department before paying a deposit. Sea state then decides whether an open site is diveable on a given day.

Where to dive in June

Start with where you will sleep. Gulf bases give you reliable options. South Andaman sites are a bonus when parks and weather allow.

• Koh Tao: the standard June base for courses and first dives, with easy shore access and many schools.
• Sail Rock: a deeper Gulf site reachable from the Koh Samui and Koh Phangan side. It suits certified divers.
• Chumphon Pinnacle: coral gardens and barracuda schools, with occasional whale sharks. It suits confident open-water divers.
• Koh Haa (South Andaman, if open): a calm lagoon with caverns such as the Cathedral. It suits most levels.
• Hin Daeng and Hin Muang (South Andaman, if open): deep pinnacles with red and purple soft coral. They suit experienced divers.
• Phi Phi, Shark Point and Anemone Reef (Phuket area, if conditions allow): walls, leopard and blacktip reef sharks, and anemone-covered reef.

Wildlife in June

Whale sharks are most likely between March and June, per PADI, so June sits at the tail of that window. Chumphon Pinnacle and Sail Rock see occasional visits. Manta season runs from mid-October to mid-May, which means June is outside it. Shark Point is named for its leopard and blacktip reef sharks, but no source guarantees June sightings. Book for the dive sites and conditions, and treat big animals as a bonus.

Day boats, liveaboards or courses?

Format matters more in June than in peak season. Weather can cancel a day boat, and a liveaboard commits you to several days. Similan liveaboards do not run in June, so any Andaman liveaboard you find is a South Andaman itinerary tied to park status. Phuket also offers the King Cruiser Wreck as a deep-wreck option. Ask an operator for its depth and the certification it requires before you book.

Getting there and getting around

Most visitors arrive at Bangkok Suvarnabhumi (BKK). PADI lists domestic flights to Phuket and Krabi at 1h 25m each. Flights to Koh Samui take 1h 15m, and Samui puts you near the dive sites of Koh Phangan and Koh Tao. Koh Tao also has a Chumphon route, with ferry legs onward. Ferry schedules and transfer times vary by operator, so check the current timetable for your dates. Add a spare day at each end in rainy season in case boats are delayed.

Costs and booking in June

June is shoulder season. One liveaboard operator says flights, rooms and liveaboard trips cost less than in peak months. Koh Tao courses are generally cheaper than elsewhere. Exact dive, course and ferry rates vary by operator, so request written quotes from two or three. Ask about the cancellation and rebooking terms in writing. Weather cancellations are more common in rainy season, and a flexible booking is worth more than a small discount.

Packing and safety for rainy-season diving

Pack a light rain jacket, reef-safe sunscreen and motion-sickness pills for boat days. Bring your own mask and dive computer for a reliable fit. Carry dive insurance that covers weather cancellations and medical evacuation. Listen closely to the operator briefing on current and surface conditions. Choose a boat with shelter for surface intervals, because showers pass quickly but can be heavy.

June versus neighboring months

Month choice shifts the coast, not the country. May is the transition month, with the Andaman closure date approaching. Read our May diving guide for that timing. Our July diving guide covers how the wet season develops.

Verdict and next step

Pick the Gulf for June if you want dependable diving, especially if you are learning or have fixed dates. Try South Andaman only with flexible dates, a confirmed park status and a backup plan on the Gulf side. Compare the whole year in our Best Time to Dive Thailand: Month-by-Month Guide guide. Avoid these mistakes.

• Booking a Similan liveaboard in June.
• Assuming year-round diving means every site is open.
• Leaving no weather buffer in your itinerary.
• Booking nonrefundable Andaman trips before checking park notices.