Thailand in May

Why May

Thailand in May works if you go to the Gulf islands. It's the start of the low season, the crowds thin out, and Koh Samui, Koh Phangan, Koh Tao and Hua Hin stay mostly dry. Koh Samui averages about 132 mm of rain in May, against 237 mm in Phuket.

The Andaman coast gets the first of the monsoon, with rougher seas and red flags, so there we plan pool days, not boat days. Visakha Bucha on Thursday 20 May is the only ban day.

Insider tip: the Similan Islands close in mid-May, so if a dive trip is on the list, do it in the first two weeks.

Put the group on Koh Samui, and May works. Ask Tanner which island suits your group.

When the rain starts

Thailand in May weather turns from hot to wet. The southwest monsoon reaches the Andaman coast and Koh Chang, and Bangkok and the north get their first heavy storms, usually late in the day. The Gulf islands' own rains don't come until October to December.

Koh Samui averages about 132 mm of May rain and Phuket about 237 mm, on the Thai Meteorological Department's 1991–2020 normals. Between the storms it stays very hot and sunny, and the north turns greener and clearer once the rains wash out the burning-season haze. Want a Gulf boat day? Ask Tanner.

What's on in May 2027

May 2027 has Labour Day and Coronation Day early in the month, and Visakha Bucha, a Buddhist holy day with an alcohol ban, on Thursday 20 May.

Labour Day falls on Saturday 1 May, with the day off on Monday 3 May, and Coronation Day is Tuesday 4 May, the Bank of Thailand's 2027 holiday list shows. Visakha Bucha brings candlelit processions at the temples.

The Full Moon Party moves off the holy day, and its own dates page lists Friday 21 May.

In Isaan, mid-May is rocket-festival season, and Yasothon's Bun Bang Fai is the best known.

See Thailand public holidays and the Thailand party calendar, and ask Tanner to plan the flights around the Full Moon.

What to book first

Very little sells out in May. Hotel prices drop from the winter peak, and you can usually book a few days ahead.

Villas near Haad Rin for the Full Moon weekend go first. Koh Samui villas go next, because the Gulf is where the sun is. Bangkok clubs, Pattaya villas and yachts on the Gulf are easy.

Ask Tanner to hold the Full Moon weekend first.

Where to take the group

Base your group on Koh Samui for the beach, take the boat to Haad Rin on Koh Phangan for the Full Moon, and go to Bangkok and Pattaya for the clubs.

Bangkok has the rooftops and the big clubs; licensed clubs in Silom, RCA and Ratchada can open until 4am under Ministerial Regulation No. 3.

Pattaya is about two hours from Bangkok, with pool villas from ฿12,500 a day. Phuket is quieter and cheaper in May, so pick a villa with a pool for the stormy afternoons.

See Koh Samui to Koh Phangan and Bangkok to Pattaya, and ask Tanner for the boat across.

Planning around Visakha Bucha

Plan Visakha Bucha, Thursday 20 May 2027, as a villa day, with your own bar stocked the day before. The day after, the Full Moon Party is expected.

AI

Photo: AI-generated image

On Buddhist holidays shops stop selling alcohol, but licensed venues in tourist areas can still serve, under the Office of the Prime Minister's 2025 notice.

The DJ, the open bar and the boat are set up before the ban; the three-day Koh Samui plan below has the prices.

Plan it with Tanner, and the holy day is a pool day.

Three days on Koh Samui, all in

Here's the May week we'd book: a Koh Samui pool villa for three days, your own catamaran to Ang Thong, and a DJ by the pool. Ang Thong marine park is closed from 1 November to 15 December 2026, so for dates in that window Tanner swaps in a Koh Tao or Koh Phangan boat day.

For 12: the villa from ฿55,500 for three days, a catamaran day quoted to your plan, a DJ from ฿8,000 and an open bar at ฿1,500 a guest. Tanner sends one price for the whole plan.

Here's the tip: book the boat for the morning, because the May storms usually come late in the day.

Tanner's pick: the boat day before Visakha Bucha, the pool on the holy day, and the Full Moon the evening after. See Koh Samui yachts.

Ask Tanner to price your May week.

Travel tips for May

Pack a light rain jacket for the late-day storms, strong sun protection, quick-dry clothes and a dry bag for the boats.

Smart casual for the clubs: a collared shirt, dark jeans and closed shoes.

Ask Tanner for the club dress code before you fly.

Is Thailand better in May or June?

May is hotter, with the rain just starting; June is wetter on the Andaman side but still good on the Gulf.

Pick May for the last hot, sunny days and a Full Moon weekend. Pick June for the quietest weeks. Tanner's pick for either month: Koh Samui, not Phuket.

See Thailand in April for the month before and Thailand in June for the month after, and ask Tanner which month fits your dates.

May at a glance

What it is: the start of the low season, with the Gulf islands as the best beach bet.

Weather: hot; Koh Samui about 132 mm of rain, Phuket about 237 mm.

Best beaches: Koh Samui, Koh Phangan and Koh Tao.

Avoid: Phuket boat days; the Similans close in mid-May.

Holidays: Labour Day 1 May, Coronation Day 4 May.

Ban day: Visakha Bucha, Thursday 20 May.

Checked November 2026.

Plan it with Tanner.