Things to Do in Koh Tao in April

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Stay in Koh Tao in April

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April on Koh Tao is the tail end of peak season, and the sea is why people come. The Gulf of Thailand tends to lie flat this month, and underwater visibility at Chumphon Pinnacle and Sail Rock often reaches 20 to 30 metres (65 to 100 feet), with whale shark sightings more likely from March to May than at any other time. If you dive or snorkel, April is probably the strongest single month to be here.

The air is another matter. Daytime highs sit around 29°C (84°F), nights barely cool to 27°C (81°F), and with humidity in the high 70s the island feels closer to 34°C (93°F) by noon. You'll feel it on the concrete climb out of Mae Haad pier, where the smell of two-stroke exhaust and grilled squid hangs in the still air and there is little breeze on the west coast until late afternoon, when Sairee Beach finally catches a warm draft off the water.

Then there is Songkran. Thai New Year turns the Sairee walking street and the Mae Haad road into a running water fight for three days, and room rates and ferry bookings rise with it. Outside that week, April still runs busy with dive students, though Chalok Baan Kao and Tanote Bay stay noticeably calmer than the Sairee strip.

Why visit in April

Flat Gulf seas and peak visibility make April one of the best dive months at Chumphon Pinnacle, Sail Rock and the Twins, with whale sharks turning up more often than in the October to December wet season.
Water temperature sits around 29 to 30°C (84 to 86°F), so most divers go without a full wetsuit, and a 3 mm shorty is plenty.
The east-coast bays, Tanote Bay and Ao Leuk, are sheltered and glassy in April, which is rarely true once the northeast winds arrive in November.
Mango season is at its height across Thailand, and the fruit on Koh Tao is sweet, cheap by island standards and everywhere.

Worth knowing

The heat index regularly climbs past 34°C (93°F) at midday, and the island's steep concrete roads to viewpoints like John-Suwan and Mango Bay are punishing between 11am and 3pm.
Songkran week pushes room rates to their April high and fills catamarans from Chumphon and Koh Samui several days in advance.
Rain arrives on roughly 12 days as short, heavy afternoon bursts that turn the dirt tracks to Ao Leuk and Hin Wong slick and red.
Ferry schedules are fixed and fill fast, so a missed connection at Chumphon pier can cost you a full day.

Best for

Think twice if

Weather measured 29° / 27°C 80mm rain · 12 rainy days · 77% humidity rains perceptibly ~1.4h/day · 82% of mornings dry

Crowds high

Pack Loose linen or quick-dry cotton, two swimsuits so one can dry, a long-sleeve rash guard for sun on the boat, reef-safe sunscreen, sandals with grip for wet concrete, and a dry bag for Songkran and afternoon storms.

Expect 80mm (3.1 inches) of rain over about 12 days, mostly as short afternoon or evening storms that roll in over the Gulf and clear within the hour. Mornings are usually bright and still. Humidity averages 77%, so sweat never quite dries, and the night air at Sairee stays warm enough that most people sleep with a fan running until dawn. May brings a sharp jump to 189mm, so April is the last reliably dry month before the southwest monsoon starts to show.

Seasonal caution

The UV index in April typically reaches 11 or higher by late morning on Koh Tao, and dive-boat decks offer little shade. Sunburn on the first boat day is the most common reason students miss day two of a course.

Year-round climate

Averages from the last 5 years.

Monthly climate averages for Koh Tao
Month	Avg high (°C)	Avg low (°C)	Rainfall (mm)
Jan	27	25	20
Feb	27	25	76
Mar	28	26	33
Apr	29	27	80
May	29	27	189
Jun	29	27	120
Jul	29	26	172
Aug	28	26	145
Sep	28	26	192
Oct	28	25	275
Nov	28	25	336
Dec	27	25	135

Holidays and festivals in April

Public holidays

Chakri Memorial Day(วันจักรี)6 April 2027
Songkran Festival(วันสงกรานต์)13 to 15 April 2027

Headline events

Nationwide Free

Songkran (Thai New Year)

April 13-15 each year, with the busiest water fights on April 13 and 14

Thailand's New Year water festival. On Koh Tao it plays out along the Sairee walking street and the Mae Haad road near the pier, where locals, dive instructors and backpackers set up barrels of water and pickup trucks roll through carrying kids with water guns. The morning often starts more gently, with residents pouring scented water over elders' hands and visiting the island's shrines. By afternoon the whole west coast is soaked, and the music from Sairee bars carries until late.

#Songkran

Best things to do in April

Whale shark watch at Chumphon Pinnacle

diving

Chumphon Pinnacle is a granite seamount northwest of the island, topping out around 14 metres (46 feet) and dropping past 30 metres (98 feet), where schools of barracuda, batfish and trevally circle the peak and whale sharks pass through to feed on plankton.

March to May brings the most frequent whale shark sightings of the year, and flat April seas make the 45-minute boat ride comfortable.

Booking tipBook the morning boat at least 2 days ahead in April, since most shops cap Pinnacle trips and fill those spots with fun divers first.

Sail Rock day trip

diving

Sail Rock sits in open water between Koh Tao and Koh Phangan. Its best-known feature is the Chimney, a vertical swim-through from about 18 metres (59 feet) up to 6 metres (20 feet).

The crossing is often too rough in the wet season, but April's calm Gulf means trips run on almost every scheduled day.

Booking tipSail Rock trips run only 2 or 3 days a week, so check the schedule the day you arrive.

Open Water course in calm conditions

diving

Koh Tao certifies more new divers than almost anywhere on earth, running training dives at shallow sites including Japanese Gardens, Twins and White Rock.

Low surge and clear water in April make buoyancy skills far easier to learn than in November, when some training sites close.

Booking tipAvoid starting a course on April 12 or 13: Songkran can disrupt afternoon sessions and the evening theory classes.

Snorkel and hike Koh Nang Yuan

snorkeling

Koh Nang Yuan is three islets joined by a white sandbar off the northwest coast. A steep wooden staircase leads to a viewpoint over the sandbar, and the Japanese Gardens reef sits a short swim from the beach.

April's low swell keeps the sandbar dry and the reef clear, and the east side of the islet stays calm even on windier afternoons.

Booking tipTake the first longtail from Sairee around 9am and you'll reach the viewpoint before the heat builds and the day-tour boats arrive.

East-coast bay hopping by longtail

boat trip

A chartered longtail from Chalok Baan Kao will take you up the east coast to Shark Bay (Thian Og), Ao Leuk, Tanote Bay and Hin Wong, stopping to snorkel at each.

April is one of the few months when all four bays are calm enough to anchor in safely, before the northeast winds arrive in October.

Booking tipNegotiate a half-day with a boatman on the Chalok Baan Kao beach the evening before, and agree on the list of bays up front.

Sunrise hike to John-Suwan Viewpoint

hiking

John-Suwan Viewpoint sits on the headland between Chalok Baan Kao and Shark Bay, reached by a short, rocky scramble to a boulder that looks out over both bays.

April middays are too hot for the climb, but a 6am start gives you the view in cooler, clear air before the haze builds.

Booking tipA small entry fee is collected at the trailhead in Chalok Baan Kao, and the booth may not be staffed before 7am.

Freediving course at Sairee

freediving

Multi-day freediving courses on the island teach breath-hold technique in a pool or on a line in deep water off Sairee and Mae Haad.

Warm water around 29°C (84°F) and near-zero current make April ideal for long, relaxed breath-holds on the line.

Booking tipCourses cap group sizes at around 4 students per instructor, so reserve a week ahead in April.

What to eat in April

On menus now

Som tam (green papaya salad)
The sour, chilli-hot Isaan salad pounded in a clay mortar is a heat-season staple on the island, and the lime and fish sauce cut through April humidity better than any curry.

Street food peaks

Khao niao mamuang (mango sticky rice)
April marks the peak of Nam Dok Mai mango season across Thailand, and the fruit on Koh Tao's dessert carts shows it: ripe, fragrant, and served at its sweetest over warm coconut sticky rice.
Pla meuk yang (grilled squid)
Squid boats work the calm Gulf nights in April, and by evening the food stalls near Mae Haad pier are selling grilled squid on skewers with green chilli seafood sauce.

What to drink

Fresh young coconut
Green coconuts cracked open with a machete are the standard drink along Sairee Beach and at Mae Haad stalls in April, and the water runs noticeably sweeter during the hot months.
Cha yen (Thai iced tea)
Orange-tinted iced tea sweetened with condensed milk sells from nearly every roadside stall in Mae Haad and Chalok Baan Kao, and by April the plastic bags of it hang from every scooter handlebar.

Regular events in April

Chakri Memorial DayFree

A Thai public holiday marking the founding of the Chakri dynasty, when government offices and banks close and the Mae Haad ferry offices can run reduced desk hours.

April 6, moved to the following Monday when it falls on a weekend

Full Moon Party on Koh Phangan

The monthly all-night beach party at Haad Rin on neighbouring Koh Phangan, with night boats from Koh Tao running on party dates and the Sairee dive crowd thinning out for a day on either side.

On or near the full moon, which shifts each April

Earth Day reef and beach cleanupsFree

Several Koh Tao dive schools and conservation groups run underwater cleanups and beach sweeps around Earth Day, usually at Sairee Beach, Mae Haad and nearby shallow reefs, and divers can often join without a fee.

Around April 22, with dates varying by organiser

Best places this April

Chumphon Pinnacle
dive site
The island's signature deep dive site, at its best in April for pelagic life and whale sharks.
Offshore, northwest of Koh Nang Yuan
Koh Nang Yuan
island and viewpoint
The three-islet sandbar and viewpoint off the northwest coast, calmest and clearest in April.
Off Sairee
Sairee Beach
beach
The island's longest beach, about 1.7 kilometres (1 mile), which catches the best sunsets in April's clear western sky and hosts the Songkran action on its walking street.
Sairee
Tanote Bay
beach and snorkel spot
A boulder-framed east-coast cove with a jumping rock and reef close to shore, sheltered and glassy in April.
Tanote Bay
Shark Bay (Thian Og)
snorkel spot
A shallow bay where blacktip reef sharks and green turtles appear on early-morning snorkels in calm April water.
Chalok Baan Kao
John-Suwan Viewpoint
viewpoint
The headland lookout above Chalok Baan Kao and Shark Bay, best at sunrise before April's heat builds.
Chalok Baan Kao
Mango Bay
snorkel spot
A small north-coast cove reached by boat or a steep track, with coral in 3 to 8 metres (10 to 26 feet) of water.
Northern tip, above Sairee
Ao Leuk
beach and snorkel spot
An east-coast bay with a sandy slope and reef on both flanks, calm through April until the late-year winds turn.
Ao Leuk

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Long-sleeve rash guardApril's UV is fierce on open boat decks, and a rash guard beats reapplying sunscreen between two dives. Shop
Reef-safe mineral sunscreenIsland shops carry it but at a markup, and April boat days burn through a bottle in a week. Shop
Waterproof phone pouch or dry bagSongkran water fighters in Sairee and Mae Haad will not spare anyone, and afternoon storms arrive fast once you are on the longtail back. Shop
3 mm shorty wetsuit (optional)Water near 29°C (84°F) means most divers skip a full suit, but a shorty makes a difference by the third dive of the day. Shop
Two quick-dry swimsuitsAt 77% humidity, a swimsuit hung on a Sairee balcony can stay damp overnight. Shop
Sandals with grippy solesThe concrete ramps to Tanote Bay and John-Suwan Viewpoint turn slick after a 20-minute April downpour. Shop
Electrolyte sachetsDivers lose fluid fast in April's heat, and dehydration raises decompression risk after deep dives at Chumphon Pinnacle. Shop
Motion sickness tabletsSeas are calm in April, but the 2-hour catamaran from Chumphon can still roll once it hits the open Gulf. Shop

Insider tips

Stay in Chalok Baan Kao rather than Sairee if you want to sleep during Songkran, since the southern village celebrates for an afternoon and goes quiet by 9pm.
Ask your dive shop for the 6am boat to Chumphon Pinnacle. The first boats on site in April get the calmest water and, locals say, the better odds of a whale shark before the crowds of bubbles arrive.
Buy your mangoes from the fruit sellers on the Mae Haad main road in the morning, when the April delivery from the mainland comes in on the early ferry.
Snorkel Shark Bay before 8am. The blacktips tend to cruise the shallows at first light and move off once April's longtail traffic starts.

Avoid these mistakes

Booking the Chumphon or Koh Samui catamaran for the day before Songkran without a reservation. Seats sell out, and the next boat may be a full day later.
Hiking to Mango Bay or John-Suwan Viewpoint at noon in April. The climbs are short but steep, and heat exhaustion on those trails sends several tourists a season to the Mae Haad clinic.
Renting a scooter to ride the east-coast roads after an April afternoon storm. The descent to Tanote Bay is one of the island's steepest, and wet concrete there causes most of Koh Tao's crashes.

Practical tips for April

Reserve Songkran-week rooms in Sairee and Mae Haad at least a month ahead and book the catamaran from Chumphon or Koh Samui at the same time. Dive shops stay open through the holiday, but some cafes in Mae Haad close on April 13 for family visits. The east coast is short on ATMs, so carry cash: Tanote Bay and Ao Leuk have few machines, and some bars accept cash only. Temples and shrines expect covered shoulders and knees, even during water fights. Tipping is not expected, though leaving small change for dive crew at the end of a course is common. Planning notes and ferry routes are covered in the Wikivoyage Koh Tao guide (https://en.wikivoyage.org/wiki/Koh_Tao#Get_in).

FAQ

Is April a good time to visit Koh Tao?

Yes, especially for diving and snorkeling: April ranks around 3rd of 12 months on the island, with flat seas and top visibility. Heat and Songkran crowds are the trade-offs.

What is the weather like in Koh Tao in April?

It is the hottest stretch of the year: warm nights, brief afternoon storms on about a dozen days, and rain totals that stay low compared with the wet season from October to December.

Is Koh Tao crowded in April?

Sairee and Mae Haad are busy all month and Songkran week is the most crowded, but Chalok Baan Kao, Tanote Bay and Ao Leuk stay noticeably quieter, even mid-month.

Can you see whale sharks at Koh Tao in April?

It is one of the likeliest months, with sightings clustering at Chumphon Pinnacle and Sail Rock between March and May, though no encounter is ever guaranteed.

Is Koh Tao LGBTQ+ friendly?

Broadly yes, with an LGBTQ+ friendliness score of 8.5/10 (sourced from TTDI's editorial rubric). The international dive community around Sairee is relaxed and mixed.