When is the best time for diving on Koh Tao?

Roughly March to September, when seas are calm and visibility at its best. Diving runs year-round, but October to December brings wind, rain and reduced visibility.

When is the rainy season on Koh Tao?

October to December, peaking in November. Like the rest of the Gulf, Koh Tao stays largely dry through the European summer months.

Can ferries to Koh Tao be cancelled?

Yes — in the November–December monsoon, rough seas occasionally halt crossings from Chumphon and Surat Thani for a day or two. Build slack into travel plans in those months.

When can you see whale sharks at Koh Tao?

Sightings happen year-round and are never guaranteed. Many divers report clusters of sightings in the settled months around March–May and again around September–October.

Best Time to Visit Koh Phayam: Season and the Quiet Months

The far north of the Andaman coast

Koh Phayam is on the Andaman side, so it follows the same calendar as Phuket and Koh Lanta: dry from November to April, monsoon from May to October. Being this far north makes little difference to the timing, but it does make the island wetter than the islands further south.

Ranong, the mainland province the boats leave from, is one of the rainiest places in Thailand. That reputation belongs to the mainland rather than the island, but it tells you what the monsoon here is like when it arrives.

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In short

Koh Phayam seasons

November–April: dry season, everything open, calm sea
May–October: monsoon, most places closed, fewer boats
Best value: November and late April
Busiest: Christmas to mid-January — still quiet by island standards
Same calendar as Phuket and Koh Lanta

The season, month by month

November is when everything reopens after the rains, and it is often the best of the year: green, calm and priced below the peak. December to February is the height of the season, with the most reliable weather and the busiest bungalows — busy here still being a very relative word.

March and April are hot and dry, with April both the hottest month and the month of Songkran, the national water festival. Late April is the last of the settled weather, and the shoulder months at either end of the season are when Ao Yai picks up enough swell to surf.

Good to know

Planning around the weather

Outside November to April, confirm your bungalow and the boat before booking flights.
The shoulder months bring enough swell to Ao Yai for beginner surfing.
Ranong on the mainland is one of Thailand's wettest provinces — pack for rain in the shoulder season.
Songkran in mid-April is a country-wide water fight; expect to get soaked.

Low season means most things shut

From May to October the monsoon closes most of Koh Phayam. A majority of the bungalow places shut for the season, the bars along Ao Yai go quiet, boat services from Ranong are reduced and occasionally cancelled in rough weather.

Some places stay open all year, and the island in the green season is genuinely beautiful and almost empty. But this is a small island with a short supply chain — if you plan a low-season trip, confirm that your accommodation, somewhere to eat and a boat all exist on your dates before you book anything else.

Month by month

January	Dry, calm and clear — peak season
February	Hot and reliable, the busiest month
March	Hot and dry, quieter, some swell returning
April	Hottest month, Songkran mid-month, season ending
May	Monsoon arrives, most places start closing
June	Wet and green, very few visitors
July	Heavy rain, boats reduced
August	One of the wettest months, most of the island shut
September	Wettest and emptiest month of the year
October	Rain easing, the island begins to reopen
November	Everything open, green and calm — best value
December	Dry and calm, prices climb towards Christmas

Frequently asked questions

When is the best time to visit Koh Phayam?

November to April. November and late April are the best value, with the same calm sea as the peak and lower prices.

Does Koh Phayam close in low season?

Mostly, yes. From about May to October the majority of bungalow places and bars close and boat services from Ranong are cut back.

Can you surf on Koh Phayam?

At a beginner level, yes — Ao Yai picks up swell in the shoulder months at either end of the monsoon. It is not a serious surf destination.

Is Koh Phayam wetter than the southern islands?

The mainland province of Ranong is one of the wettest in Thailand, and the island shares that weather system, so the monsoon here is emphatic when it comes.

Travel guides

More Koh Phayam and Andaman coast guides, plus the rest of Thailand's islands.

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Koh Phayam

Koh Phayam

Best time to visit Koh Phayam