Weather and tide forecast for the Gulf of Thailand (Samui, Phangan, Tao, Surat Thani)
This weather and tide forecast for the Gulf of Thailand covers Koh Samui, Koh Phangan, Koh Tao and the mainland gateway of Surat Thani — the four points most ferry, bus and minivan journeys in this area connect. Conditions here change quickly, so we publish a day-by-day outlook alongside sailing notes to help you plan around the sea rather than against it.
Weather Forecast for Gulf of Thailand (Samui/Phangan/Tao/Surat Thani) December 23–29, 2024
Monday: Temperature: 30-32°C. Weather: Partly cloudy with occasional showers. Sailing Conditions: Wave height 0.5-1m. Tide: Moderate tidal changes.
Tuesday: Temperature: 29-31°C. Weather: Scattered thunderstorms in the afternoon. Sailing Conditions: Wave height 1-1.5m. Tide: High tide in the early morning.
Wednesday: Temperature: 28-30°C. Weather: Heavy rain showers. Sailing Conditions: Wave height 1.5-2m (caution advised). Tide: Low tide in the afternoon.
Thursday: Temperature: 30-32°C. Weather: Mostly sunny with light breezes. Sailing Conditions: Wave height 0.5-1m. Tide: Balanced tidal levels.
Friday: Temperature: 31-33°C. Weather: Sunny with mild cloud cover. Sailing Conditions: Wave height 0.5m. Tide: Early morning low tide.
Saturday: Temperature: 29-31°C. Weather: Afternoon showers. Sailing Conditions: Wave height 1m. Tide: High tide midday.
Sunday: Temperature: 30-32°C. Weather: Clear skies with occasional clouds. Sailing Conditions: Calm seas, wave height below 0.5m. Tide: Evening low tide.
What changed this week
The week opens unsettled and ends calm. Wave heights build from 0.5-1m on Monday to a midweek peak of 1.5-2m on Wednesday, when heavy rain showers and the caution advisory apply, then ease steadily to below 0.5m by Sunday. Temperatures stay in a narrow 28-33°C band throughout, so rain and swell — not heat — are what shape your travel days.
Who this affects
Sea conditions matter most on the open-water legs between Surat Thani, Koh Samui, Koh Phangan and Koh Tao. The Koh Tao crossing is the longest and most exposed, so it feels swell first. Mainland road connections by bus, minivan or private transfer are far less affected by wave height, though heavy rain can slow driving times.
Practical impact for travellers
On Wednesday, allow extra buffer time and avoid booking a same-day onward flight or long-distance connection. Tides matter at shallow piers: a low tide in the afternoon on Wednesday, an early morning low tide on Friday and an evening low tide on Sunday can affect boarding at smaller landings. If you are sensitive to motion, Thursday, Friday and Sunday are the smoothest travel days this week.
Plan your crossing
Check live departure times and seat availability for the Surat Thani to Koh Samui ferry, the Koh Samui to Koh Phangan route and the Koh Phangan to Koh Tao crossing, or browse everything serving Koh Tao. Operators, times and fares shown at checkout are always the current ones.
Disclaimer: Weather, sea conditions, and tide information are subject to change. Always check local updates and forecasts before planning activities. Note: this forecast covers a fixed historical week (December 23–29, 2024) and is not a live feed — we have flagged this rather than presenting it as current.
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