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Most rainy-season advice about Thai islands is written for the wrong coast. Phuket and the Andaman side get their monsoon from May to October; Koh Phangan sits in the Gulf, and our wet season arrives later and shorter — roughly mid-September to early December, with October and November carrying most of it. By mid-December the island flips into its long dry run through April.
We live here year-round, so here's what the rain actually looks like from a deck on Haad Tien — and who should and shouldn't book it.
What a rainy day here actually is
It is almost never a rained-out week. The storms come and go — a dark sky builds over the bay, the rain arrives loud and serious for an hour or two, and then it moves on. Between storms there are sunny days, sometimes strings of them. The sea stays warm all year, around 28–30°C; what changes is the swell, which some days makes swimming a bad plan on our side.
And here's the part the guidebooks skip: a storm rolling across the bay, watched from a covered deck with a pot of tea, is one of the best shows the island puts on. The jungle turns a green it doesn't reach in March. This is the season the bay smells like rain and woodsmoke, and the houses earn the word cozy.
What wakes up in the rain
The seasonal waterfall beside Jungle House and White House runs and gets audible — the treehouse sits on stilts directly over its granite basin, and falling asleep to it is the whole argument for booking that house in October. The canal past River and Canal House flows again. None of it is promised outside the rains; that's exactly why the season has its own fans.
The practical side
Rough-sea days are real: when the waves say no, the taxi boats stop and the 4×4 from Ban Tai takes over — it gets through in any weather. Build one flexible day around arrivals and departures rather than a tight connection. The boat guide has the details →
The reward for the flexibility: November to mid-December is the quietest the island gets, and rates follow. If your trip is about reading, writing, cooking and the occasional dramatic sky — rather than fourteen consecutive beach days — it's arguably the smartest-value window of the year.
Who it's for
Book the rainy season if you like weather as an event, want the bay at its emptiest and greenest, and can shrug off a swimming day lost to swell. Skip it if the trip fails without daily flat seas — come in May, June or July instead, when our side of the island is at its calm best.
The short version
Gulf coast, not Andaman: our rain peaks October and November and clears by mid-December. Storms pass, sun returns, waterfalls run, rates drop. Bring a book, take the truck on rough days and let the bay put on its show.
Spice is our family's place on Haad Tien — houses in the jungle with deep covered decks, a garden restaurant and the bay's minimart. The houses →