Gulf of Thailand weather forecast for Samui, Pha Ngan, Tao and Surat Thani
This Gulf of Thailand weather and tide forecast covers Koh Samui, Koh Pha Ngan, Koh Tao and Surat Thani for the period 10 to 15 June 2025, so you can see at a glance how sea conditions, temperatures and tide times line up with your travel dates.
Gulf of Thailand Weather Forecast (Samui/Pha Ngan/Tao/Surat Thani) June 10 to 15 June, 2025.
Six-day forecast and tide times
Tuesday, June 10
Temperature: 27–33°C
Weather: Cloudy with afternoon rain
Sailing Conditions: Moderate (~1.5 m waves)
Tide: High: 5:52 pm (2.88 m) Low: 11:04 am (1.86 m)
Wednesday, June 11
Temperature: 28–34°C
Weather: Cloudy, occasional thunderstorm
Sailing Conditions: Slightly choppy (~1.2 m waves)
Tide: High: 6:32 pm (2.79 m) Low: 11:41 am (1.78 m)
Thursday, June 12
Temperature: 27–33°C
Weather: Thunderstorms in morning, overcast
Sailing Conditions: Choppy (~1.6 m waves)
Tide: High: 7:11 pm (2.70 m) Low: 12:17 pm (1.70 m)
Friday, June 13
Temperature: 27–33°C
Weather: Mostly cloudy, scattered thunderstorms
Sailing Conditions: Slightly choppy (~1.4 m waves)
Tide: High: 7:50 pm (2.60 m) Low: 12:53 pm (1.63 m)
Saturday, June 14
Temperature: 27–32°C
Weather: Heavy showers in the afternoon
Sailing Conditions: Slightly choppy (~1.3 m waves)
Tide: High: 8:30 pm (2.50 m) Low: 1:28 pm (1.57 m)
Sunday, June 15
Temperature: 27–35°C
Weather: Partly sunny, chance of afternoon showers
Sailing Conditions: Mild (~1.2 m waves)
Tide: High: 9:10 pm (2.40 m) Low: 2:02 pm (1.51 m)
How to read the sailing conditions
The wave heights above describe open-water conditions between the mainland and the islands. Mild and slightly choppy days (around 1.2–1.4 m) are usually comfortable crossings. Moderate and choppy days (around 1.5–1.6 m, such as Tuesday 10 and Thursday 12 June) can mean a bumpier ride, particularly on smaller and faster boats.
Sea state is only one factor. Thunderstorms, visibility and port decisions also shape whether a departure runs on time, and operators make those calls independently on the day.
What this means for your trip
Afternoon rain and thunderstorms feature on most days this week, with the calmest sea state on Sunday 15 June and the roughest on Thursday 12 June. If you are prone to seasickness, morning departures generally sit ahead of the afternoon storm build-up.
Tide times matter mainly at shallow piers and for beach transfers by longtail boat. High water falls in the evening across the whole period, moving later each day from 5:52 pm on Tuesday to 9:10 pm on Sunday, while low water sits around the middle of the day.
Practical steps: keep a buffer between your boat arrival and any onward flight or connection, pack a rain layer and a dry bag for luggage, and check your operator's updates on the morning of travel. Where conditions disrupt a sailing, rebooking and refund options depend on the operator's own booking conditions shown at checkout.
Plan your crossing
Compare live departure times, operators and prices for travel between Surat Thani, Koh Samui, Koh Pha Ngan and Koh Tao, including combined bus and boat tickets from the mainland.
Disclaimer: Weather, sea conditions, and tide information are subject to change. Always check local updates and forecasts before planning activities.
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