The Best Time to Visit Koh Phangan — A Month-by-Month Guide
When to come to Koh Phangan — the weather month by month, the quietest seasons, and the trade-offs between sun, crowds, and price. Written by the people who live here.
Koh Phangan has a dry season and a wet season, and the dry one is longer than most travellers expect. The short answer is that late December through mid-April is the most reliable window — dry days, calm seas, cooler evenings. But every month on the island has a character worth knowing. What follows is the pattern we plan around, year after year, from the ground.
None of these months are absolutes — weather on Koh Phangan has become less predictable in the last decade, and a “wet” month can still give you a week of glassy seas. The notes below describe what we see most years, not every year.
December to January — high season settles in
The cool season arrives in late November and settles in by the middle of December. Mornings are cool enough that some guests ask for a blanket. Afternoons hover in the high 20s (°C). The sea is flat on both coasts, which matters if you want to snorkel at Mae Haad or take a longtail boat to Bottle Beach.
Christmas and New Year are the busiest nights of the year. The island fills up, the good restaurants need reservations, and taxi prices go up. If you can, come either side of that week — the second week of January is as good as the first week of December and noticeably quieter.
February to March — the sweet spot
The driest, most pleasant weeks of the year. Days are warm but not oppressive, humidity is manageable, and it almost never rains. The gardens look their best right after the January rains have moved through.
This is the stretch we recommend for families, for travellers bringing small children, and for anyone who wants to be outside all day without checking the sky. It’s also the easiest window to plan — we rarely see ferry cancellations in these two months.
Rates are at their peak. If you’re price-sensitive, nudge the trip into April.
April — the hot, honest month
April is interesting. The first two weeks are still dry and hot — the hottest stretch of the year, with afternoons reaching 33–34 °C. Then Thai New Year (Songkran) hits around the 13th, and the whole country slows down. The island is busy with Thai families for about a week. By the last week of April, the international crowd has thinned, and the weather starts to turn.
Pool weather is perfect all month. If you don’t mind the heat, late April is one of the best-value times of year: warm enough to swim every day, quiet enough that restaurants feel local again, and the rates are lower than February by a noticeable margin.
We came in late April expecting a compromise and got some of the best beach days of our lives. Fewer people, same sky.
May — cicadas and mangoes
Hot, humid, and you might catch an afternoon storm. But the mornings are usually bright and long, the beaches are clean and half-empty, and the mangoes are the best of the year. Our garden is loud with cicadas by the second week.
May is also when many of the west-coast yoga retreats begin their spring cycles. If you’re here for that, it’s a fine month.
June to September — the long summer
Technically the “green season,” though we call it the long summer. You’ll get sunshine for most of the day, followed by a short, heavy afternoon shower that passes in thirty minutes. The jungle goes emerald. The waterfalls — Than Sadet, Phaeng — are actually running, which only happens for a few months a year.
The sea can get choppy on the west coast in July and August. Ferries still run on schedule almost every day. Scooter roads are slick after a downpour; riders who aren’t confident should pick afternoons carefully or take a car.
This is the quietest stretch of the year on the island, which means:
- Easier reservations at the good restaurants.
- Less traffic on the Thong Sala road.
- Beaches almost entirely to yourself on weekdays.
- Our own lowest nightly rates of the year.
If you’re coming for peace and don’t mind getting wet sometimes, this is your window.
October to early November — the one to avoid
The one stretch we don’t recommend. October is the true monsoon on the east side of Thailand. We see multi-day rain events, ferry cancellations, and occasional short power interruptions. The pools are still usable most days, but beach days are unpredictable.
If you already have flights booked for October, you can still have a great time — we’ve hosted guests through entire storms who said the garden under rain was the prettiest they’d seen it. But if you’re choosing a month, skip to late November.
Mid-November — the secret shoulder
Weather breaks around the 15th of November in a normal year. The rain lifts, the sea flattens, the trees drop the last of the wet-season growth, and everything looks washed clean. Prices are still at shoulder-season levels. This is one of our favourite weeks of the year on the island.
What about the Full Moon Party?
The Full Moon Party happens once a month on Haad Rin, the southernmost tip of Koh Phangan. It draws a crowd — mostly young, mostly for the one night. SHI is on the opposite side of the island. Guests who come during a full moon rarely notice it unless they go looking for it.
If you want nothing to do with it, avoid the two nights either side of the full moon. The Full Moon Party dates are published months in advance. If you’re curious, it’s a scooter or taxi ride away, and you’ll be back in the garden before dawn.
Best months, by what you’re after
| If you want | Come in |
|---|---|
| Dry, cool, easy | February, March |
| Longest sunny days with fewer people | June, July |
| Pool weather on a budget | Late April, May |
| Snorkelling (calm seas, best visibility) | February, March, late November |
| Yoga and wellness retreats | January–March, May–July |
| A property that feels entirely private | August, September |
Weather at a glance
| Month | Avg high (°C) | Rainy days | Sea condition |
|---|---|---|---|
| Jan | 28 | 6 | Calm, clear |
| Feb | 29 | 3 | Glass |
| Mar | 30 | 3 | Glass |
| Apr | 32 | 5 | Calm |
| May | 32 | 9 | Mixed |
| Jun | 31 | 10 | Choppy west |
| Jul | 31 | 8 | Choppy west |
| Aug | 31 | 9 | Mixed |
| Sep | 31 | 11 | Mixed |
| Oct | 30 | 16 | Rough |
| Nov | 28 | 17 | Rough → calm mid-month |
| Dec | 28 | 10 | Settling to calm |
A note on booking timing
For peak weeks (late December through February), book three to four months ahead. We only have seventeen villas, and they fill up for Christmas, New Year, and Chinese New Year before the end of October.
For shoulder and green season, two to four weeks is usually enough. For last-minute plans, reach out — we can often find a way.
Useful links for planning
- Thai Meteorological Department Official forecasts and seven-day outlook for southern Thailand.
- Windy.com — Ko Pha-ngan Wind and swell forecasts. Useful for deciding on boat-day windows.
- Full Moon Party dates Official party calendar if you want to avoid the week or plan around it.
- Thai public holidays Songkran and other national holidays drive local travel — worth planning around.
- Direct booking — stay.shi.villas Check real-time availability for the dates you have in mind.
