The best weather on Koh Phangan is generally from late January to March: drier, calmer and clearer. April and May are the hottest months. The Gulf side usually sees its heaviest rain and roughest seas from October to December. From roughly May to September the weather is more variable, with lower prices and fewer visitors.
Koh Phangan weather by season
| Period | What to expect | Good for |
|---|---|---|
| Late Jan to March | Typically the driest and calmest weather, with the clearest water | Beach days, swimming, first visits |
| April to May | The hottest months; many places drop prices from April | Heat lovers, bargains, pool days |
| June to September | More variable weather, with sunny spells and showers; lower prices and fewer people | Quiet stays, value, flexible travellers |
| October to December | Usually the heaviest rain and roughest seas on the Gulf side; sea crossings can be affected | Cheaper stays if you are flexible about weather |
This is a general summary of travel guides such as Champion Traveler, Thai Holiday Guide and North Vietnam Travel. Guides disagree on exact month boundaries, and weather varies year to year, so treat the months as a guide, not a promise.
What the weather means at the villa
- Boats and sea. We are reached by taxi boat or 4x4. Rough seas can affect boat crossings, so in the wetter months tell us your plans and we will help you choose the best way in.
- The pools. They are filled with fresh waterfall water, so after recent rain the water can look cloudy; it is always clean.
- The deck. The deck and hammocks are the heart of the villa. On a clear evening the view over the bay is the reason people come.
- Prices and crowds. Shoulder and low seasons are generally cheaper and quieter across the island.
Common questions
What is the rainy season on Koh Phangan?
Koh Phangan is on the Gulf of Thailand side, where guides generally put the heaviest rain from October to December. Showers can happen at any time of year.
Is Koh Phangan good to visit in the low season?
Many people enjoy it: fewer crowds and lower prices, with more variable weather. Be ready for showers and flexible with boat and ferry plans.
When is the sea calmest for swimming?
Guides generally say the water is calmest and clearest from about January to March.
Last updated 13 October 2026.