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Koh Tao weather, wind and sea
On Koh Tao the question is usually not just "will it rain" but "is the crossing rough and will the dive site be worth it". This page pairs live radar with wind and wave data, so you can see a squall building before it reaches Sairee or Chalok Baan Kao.
Ferry crossings to Chumphon and down to Koh Phangan and Koh Samui are the most weather-sensitive part of a Koh Tao trip — during the northeast monsoon, sailings can be delayed or cancelled at short notice.
Koh Tao weather by season
- January – March
- Generally the driest stretch in the Gulf of Thailand. Short showers still happen, but long clear windows are common.
- April – June
- Hot and humid with build-up afternoon storms. Mornings are usually the safest window for boats and scooters.
- July – September
- Mixed. Passing squalls roll through quickly — radar timing matters more than the daily forecast icon.
- October – December
- Northeast monsoon: the wettest period. Heavy multi-hour rain and occasional ferry disruption are normal.
Koh Tao weather FAQ
- Is it raining on Koh Tao right now?
- The card at the top of this page answers that from live radar, updated every few minutes, and tells you which coast the rain is on and roughly when it clears.
- Will it rain on Koh Tao in the next 2 hours?
- Island Pulse tracks radar cells and their direction of travel, so the page gives a clock-time estimate for arrival instead of a vague daily icon. Beyond about 2 hours it switches to model forecast.
- When is the rainy season on Koh Tao?
- The Gulf islands run on the northeast monsoon, so October to December is the wettest period — unlike Phuket and the Andaman side, which peak mid-year.
- How accurate is the forecast?
- Short-range radar nowcasting is reliable for roughly the next 1–2 hours. The 7-day outlook is model data and, as the card notes, is indicative only beyond three days.
- Will the ferry to Koh Tao run today?
- Island Pulse can't confirm an operator's decision, but the sea and wind card on this page shows the conditions those decisions are usually based on. Always check directly with your ferry operator during rough weather.