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 port area around Surat Thani, so you can see how sea conditions are expected to develop before you travel.
Weather Forecast for Gulf of Thailand (Samui/Phangan/Tao/Surat Thani) Jan 28, 2025 – February 2, 2025.
Day-by-day outlook
Tuesday, January 28
- Temperature: 29°C (high), 26°C (low).
- Weather: Breezy with scattered showers.
- Sailing Conditions: Wave height increasing to ~1.3m.
- Tide: High at 10:37 AM (2.46m), low at 9:22 PM (0.61m).
Wednesday, January 29
- Temperature: 30°C (high), 24°C (low).
- Weather: Intervals of clouds and sun, occasional showers.
- Sailing Conditions: Wave height ~0.9m.
- Tide: High at 11:26 AM (2.54m), low at 9:37 PM (0.62m).
Thursday, January 30
- Temperature: 30°C (high), 24°C (low).
- Weather: Mostly sunny with light clouds.
- Sailing Conditions: Wave height ~0.7m.
- Tide: High at 12:08 PM (2.58m), low at 9:49 PM (0.67m).
Friday, January 31
- Temperature: 30°C (high), 24°C (low).
- Weather: Sunny with light cloud cover.
- Sailing Conditions: Wave height ~0.5m.
- Tide: High at 12:46 PM (2.56m), low at 9:54 PM (0.76m).
Saturday, February 1
- Temperature: 29°C (high), 24°C (low).
- Weather: Clear skies, beautiful conditions.
- Sailing Conditions: Wave height ~0.3m.
- Tide: High at 1:20 PM (2.50m), low at 9:54 PM (0.90m).
Sunday, February 2
- Temperature: 30°C (high), 25°C (low).
- Weather: Mostly sunny, calm.
- Sailing Conditions: Wave height ~0.3m.
- Tide: High at 1:50 PM (2.40m), low at 9:54 PM (1.05m).
What changed across the week
The main change is a steady calming of the sea. Waves peak at the start of the period, increasing to around 1.3m on Tuesday, then ease to about 0.9m on Wednesday, 0.7m on Thursday and 0.5m on Friday, before settling near 0.3m over the weekend.
Rain follows the same pattern. Scattered showers on Tuesday give way to occasional showers on Wednesday, then mostly sunny and clear skies from Thursday onwards. Daytime highs stay in a narrow 29–30°C band throughout, so temperature is not the deciding factor — wind and swell are.
Who this affects
Sea conditions matter most if you are crossing between the mainland and the islands, or hopping between them. Higher swell early in the week can mean a bumpier ride, and in some cases operators adjust or cancel departures for safety. Smaller, faster craft feel the motion more than larger vessels.
Tide times are worth noting too. Highs shift later each day, from 10:37 AM on Tuesday to 1:50 PM on Sunday, while evening lows stay close to 9:22–9:54 PM. Very low water can affect shallow piers and beach landings, and it also shapes swimming and snorkelling conditions on shallow shores.
Planning your trip around the forecast
If your plans are flexible, the calmer second half of the window is the easier stretch for travel and for anyone prone to seasickness. If you must travel on the breezier days, allow buffer time before onward connections such as flights or long-distance transfers, and keep an eye on operator updates.
You can compare departure times, operators and fares for your dates on our Surat Thani to Koh Samui, Koh Samui to Koh Phangan and Koh Phangan to Koh Tao route pages.
Disclaimer
Weather, sea conditions, and tide information are subject to change. Always check local updates and forecasts before planning activities.
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