Weather and tide forecast for the Gulf of Thailand: what the week ahead looks like
This weather and tide forecast for the Gulf of Thailand covers Koh Samui, Koh Phangan, Koh Tao and the mainland gateway of Surat Thani, so you can see at a glance how conditions may affect your crossing before you book.
The forecast below is a snapshot for the dates shown. Sea states in the Gulf change quickly, so treat it as guidance rather than a guarantee and re-check closer to your travel date.
Weather Forecast for Gulf of Thailand (Samui/Phangan/Tao/Surat Thani) February 10 - February 16, 2025
Monday, February 10
- Temperature: High 83°F (28°C), Low 76°F (25°C)
- Weather: Mostly sunny
- Sailing Conditions: Wave height 1.2m
- Tide: High at 8:49 AM (4.4 ft), Low at 8:14 PM (0.13 ft)
Tuesday, February 11
- Temperature: High 87°F (30°C), Low 77°F (25°C)
- Weather: Some sun, turning cloudy
- Sailing Conditions: Wave height 1.3m
- Tide: High at 9:42 AM (4.4 ft), Low at 8:42 PM (0.23 ft)
Wednesday, February 12
- Temperature: High 87°F (31°C), Low 78°F (25°C)
- Weather: Partly cloudy
- Sailing Conditions: Wave height 1.4m
- Tide: High at 10:31 AM (4.3 ft), Low at 9:02 PM (0.39 ft)
Thursday, February 13
- Temperature: High 87°F (31°C), Low 79°F (26°C)
- Weather: Sunny
- Sailing Conditions: Wave height 1.2m
- Tide: High at 11:14 AM (4.1 ft), Low at 9:11 PM (0.62 ft)
Friday, February 14
- Temperature: High 88°F (31°C), Low 78°F (26°C)
- Weather: Very warm, mostly sunny
- Sailing Conditions: Wave height 1.1m
- Tide: High at 11:52 AM (3.81 ft), Low at 9:08 PM (0.89 ft)
Saturday, February 15
- Temperature: High 88°F (31°C), Low 78°F (26°C)
- Weather: Mostly sunny
- Sailing Conditions: Wave height 1.0m
- Tide: High at 12:26 PM (3.45 ft), Low at 8:57 PM (1.12 ft)
Sunday, February 16
- Temperature: High 87°F (31°C), Low 80°F (26°C)
- Weather: Mostly cloudy
- Sailing Conditions: Wave height 1.3m
- Tide: High at 12:58 PM (3.02 ft), Low at 8:41 PM (1.31 ft)
What changes across the week
Temperatures stay warm and stable, climbing from a high of 83°F (28°C) on Monday to 88°F (31°C) on Friday and Saturday, with overnight lows never dropping below 76°F (25°C).
Wave height is the figure worth watching. It peaks at 1.4m on Wednesday, eases to its calmest at 1.0m on Saturday, then rises again to 1.3m on Sunday under mostly cloudy skies.
Tides shift steadily later each day. High tide moves from 8:49 AM on Monday to 12:58 PM on Sunday, and the peak height falls from 4.4 ft early in the week to 3.02 ft by Sunday — a noticeably smaller tidal range at the weekend.
Who this affects
Anyone crossing between Surat Thani, Koh Samui, Koh Phangan and Koh Tao. Longer open-water legs are the most exposed to swell, while shorter island hops are generally less affected.
It also matters for travellers with connecting bus, minivan or private transfer bookings on the mainland side, where a delayed sailing can affect the onward leg.
Practical impact for travellers
- On higher-wave days, consider a larger vessel type if one is offered on your route, and sit low and central if you're prone to seasickness.
- Leave a buffer between your crossing and any flight, train or onward transfer.
- Low tides in the evening can affect small-boat pier access at some beaches; check with your accommodation.
- Operators may adjust or cancel departures in poor conditions — check your booking conditions and the operator's updates on the day.
Book your Gulf of Thailand crossing
Live departure times, operators, journey durations and prices are shown at the booking step for each route. Compare options for Surat Thani to Koh Samui, Koh Samui to Koh Phangan and Koh Phangan to Koh Tao, or browse all Gulf of Thailand ferry routes to plan your island-hopping order.
Search availability for your dates to see what's running and confirm your seats.
Disclaimer: Weather, sea conditions, and tide information are subject to change. Always check local updates and forecasts before planning activities.
