Diving in Thailand in March: Where to Go and What to Expect
Diving in Thailand in March: Andaman vs Gulf, liveaboard vs day trips, costs in ฿, courses and who should choose which.
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Last updated November 2026: diving in Thailand in March is generally dry-season diving on the Andaman side, and operators also cite Koh Tao in the Gulf as a good-visibility month. Our short answer is yes, with one trade-off: the Andaman has the bigger sites but longer boat rides, while the Gulf is easier for courses. For the full-year picture, start with our best time to dive Thailand overview.
Featured image: Nata Mostova, CC BY-SA 4.0, via Wikimedia Commons.
Diving in Thailand in March: Is It a Good Month?
March sits at the tail end of the dry season. Operators generally class the Andaman Sea as in season from November to April. Koh Tao is cited for its best visibility from March to May. Conditions shift from year to year, so treat these as patterns rather than promises. Our page on Thailand sea temperatures adds the warmth and visibility context. We'd choose the coast by trip goal: big-fish sites on the Andaman, training and easy access in the Gulf.
| March at a glance | Andaman Sea | Gulf of Thailand |
|---|---|---|
| Conditions | Dry season, typically calm and clear | Koh Tao cited for best visibility, March to May |
| Headline sites | Similan Islands, Surin Islands, Hin Daeng, Hin Muang, Koh Bon, Richelieu Rock | Koh Tao reefs, Pattaya wrecks |
| Main caveat | Long boat rides to the best sites | Pattaya visibility is usually listed as best November to February |
| Best for | Certified divers chasing manta rays and whale sharks | Courses, beginners, short trips |
Andaman Sea in March
Andaman diving in March centers on the Similan Islands, Surin Islands, Koh Bon, Hin Daeng, Hin Muang and Richelieu Rock. Operators link March with manta ray and whale shark sightings at Hin Daeng, Koh Bon and Richelieu Rock. Sightings are never guaranteed. A dive center's own sighting log is a better guide than any forum post. Visibility at the Similans can reach roughly 30 m on good days, per operators. Day boats from Khao Lak take about 1.5 hours by speedboat to the Similans, and the open sea can be rough. Operators commonly list the Similan season as mid-October to mid-May, which covers March. Official park dates and fees come from the national parks authority. Closer to Phuket, the Racha Islands and Phi Phi make easier days. We'd save Similan and Richelieu Rock trips for when you have several diving days.
Gulf of Thailand in March
Koh Tao is the Gulf's training hub, and operators cite March to May as its best visibility window. Pattaya sits 1.5 hours from Bangkok airport, which makes it the easiest dive trip from the capital. Its best visibility is usually listed as November to February, so March can be murkier there. Pattaya is known for wrecks, and many wreck dives are Advanced-level. Divers mention whale shark sightings off Koh Tao, but those reports are anecdotal. We wouldn't plan a trip around them. Gulf diving suits Open Water students, divers short on time and anyone starting from Bangkok.
Liveaboard vs Day Trips: Which Fits Your March Trip?
Our rule is simple. Pick a liveaboard when diving is the point of the trip. Pick day trips when a partner is waiting on land. Divers report that Richelieu Rock is a day trip from Khao Lak but not from Phuket. Route claims like this change by operator, so ask yours before paying a deposit.
| Factor | Liveaboard | Day trips |
|---|---|---|
| Time | Best with several free days | Fits one or two free days |
| Sites | Hin Daeng, Koh Bon, Richelieu Rock, Similans | Racha, Phi Phi, Shark Point, some Similan trips |
| Seasickness | Fewer daily transits, but nights at sea | Long open-water crossings every day |
| Budget | Higher up front, meals and bunks included | Pay per day, plus lodging ashore |
| Non-diving partner | Away from them for the whole trip | Together in the evenings |
| Certification | Suits experienced divers | Suits all levels, including courses |
Where to Base Yourself for March Diving
Phi Phi sites such as Bida Nai and Bida Nok lie about 1.5 hours or more from the southern end of Phuket. They sit closer to Krabi on the mainland. Phi Phi gets busy, so go early in the day. We'd choose a base by what your partner likes to do, since diving is good from all of them. Khao Sok and Phang Nga Bay are the land options people pair with Khao Lak and Phuket.
| Base | Typical dive access (verify with your operator) |
|---|---|
| Khao Lak | Similan Islands and Richelieu Rock day trips |
| Phuket | Racha Islands, Shark Point, Phi Phi, Similans, Koh Bon, Hin Daeng, Hin Muang |
| Phi Phi | Shark Point area and Phi Phi sites |
| Ao Nang | Shark Point area and Phi Phi sites |
| Koh Lanta | Hin Daeng, Hin Muang and Phi Phi |
| Koh Tao | Gulf reefs and training dives |
| Pattaya | Wrecks and artificial reefs |
What Diving in Thailand Costs in March
Prices and hours checked November 2026. Operator price ranges put a single fun dive at ฿1,000–฿2,500. Courses run ฿12,000–฿25,000 depending on level and location. Open Water sits at ฿12,000–฿20,000, and Advanced at ฿12,000–฿18,000. Dive packages with lodging and transport range from ฿15,000 to ฿50,000. Basic guesthouse rooms start around ฿300–฿500 per night. Island food and lodging cost more than on the mainland. Add park fees, gear rental and dive insurance to your budget. High season runs November to April, so March bookings need lead time, and liveaboards fill first.
- Day boat or liveaboard: the biggest price driver
- Park fees: listed by the national parks authority
- Gear rental and dive insurance
- Island food and lodging premium
Learning to Dive or Upgrading in March
Koh Tao and Pattaya are the usual training hubs. PADI and SSI are the common agencies. Open Water usually takes 3 to 4 days, including e-learning review, pool sessions and open water dives. Advanced certification opens the wreck dives that are closed to Open Water divers. Experienced Advanced divers get the most from the Andaman sites in March. Before comparing course prices, run through this checklist.
A short trip can still fit an Open Water course, which usually runs 3 to 4 days. Book early, since March is high season and liveaboards fill first.
- Does the price include boat dives or only beach dives?
- How many students share each instructor?
- Are gear, study materials and certification fees included?
- Is lodging bundled, and is it priced fairly for the island?
- What are the instructor's experience and the school's safety record?
Sample Trip Shapes
These are structures, not schedules. Fit them to the operator's actual departure days.
- Liveaboard-focused, 5 to 7 days: board in Phuket or Khao Lak, and add land days at either end.
- Mixed 9-day trip: 4 dive days and 5 land days, split across two bases.
- Couple with a non-diver: day boats from one base, with Phi Phi, Khao Sok or Phang Nga Bay on the off days.
Mistakes to Avoid and Who Should Skip March
Skip March diving if megafauna is your only goal, because no operator can promise it. Light on time? Don't book a Similan day trip, since the boat ride eats the day. Prone to seasickness? Pick sheltered sites near Phuket or the Gulf.
Khao Lak day boats need about 1.5 hours to reach the Similans, so pair that trip with spare days, not a single afternoon.
- Assuming guaranteed manta rays or whale sharks
- Comparing course prices without checking inclusions
- Booking long open-water crossings with a small time window
- Leaving booking late in high season
Shifting Your Dates: Other Months to Dive in Thailand
If you can shift your dates, February diving conditions and April diving conditions are the nearest alternatives. Each month has its own trade-offs, so pick by coast and goal.
Frequently Asked Questions
Is March a good month to go to Thailand?
For the Andaman coast, March falls in the dry season that operators list as November to April. Koh Tao in the Gulf is also cited for good visibility from March to May.
Notes for your next dive trip
Optional updates to our Thai diving guides.
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