Weather and Tide Forecast for the Gulf of Thailand (Samui/Phangan/Tao/Surat Thani)

Gulf of Thailand Weather Forecast (Samui/Pha Ngan/Tao/Surat Thani) June 23 to 29 June, 2025.

Monday 23 June 2025

Temperature: 27 °C
Weather: Heavy rain (40% area)
Sailing Conditions: SSW 15–35 km/h
Wave Height: ~1 m in Gulf; 1–2 m offshore; >2 m in thundershowers
Tides: Low: 9:12 AM (~0.88 m) High: 9:03 PM (~2.40 m)

Tuesday 24 June 2025

Temperature: 26–27 °C
Weather: Heavy rain (40% area)
Sailing Conditions: Wind 15–35 km/h
Wave Height: Same pattern—1 m in Gulf; up to >2 m in storms
Tides: Low: 8:50 AM (~0.73 m) High: 9:54 PM (~2.56 m)

Wednesday 25 June 2025

Temperature: ~26–27 °C
Weather: Heavy rain increases to 60% area
Sailing Conditions: SSW winds 15–35 km/h
Wave Height: ~1 m in Gulf; 1–2 m offshore; >2 m in thundershowers 

Tides: Low: 9:05 AM (~0.63 m) High: 10:48 PM (~2.66 m)

Thursday 26 June 2025

Temperature: ~26–27 °C 

Weather: Heavy rain continues (60% area)

Sailing Conditions: SSW 15–35 km/h

Wave Height: ~1 m typical; 1–2 m offshore; >2 m in storms 

Tides: Low: 9:33 AM (~0.59 m) High: 11:41 PM (~2.69 m)

Friday 27 June 2025

Temperature: ~26–27 °C

Weather: Continued heavy rain in region

Sailing Conditions: SSW 15–35 km/h; caution through storms
Wave Height: ~1 m in Gulf; 1–2 m offshore; >2 m in storms
Tides: Low: 10:03 AM (~0.61 m) High: ~Early AM (~2.70 m est.)

Saturday 28 June 2025

Temperature: ~26–27 °C
Weather: Rain probability drops to ~40%
Sailing Conditions: Winds 15–30 km/h; calmer seas expected
Wave Height: ~1 m in Gulf; 1–2 m offshore; >2 m in storms
Tides: Low: 10:26 AM (~0.66 m) High: ~Evening (~2.66 m est.)

Sunday 29 

Temperature:  27–28 °C
Weather: Rain chance easing (10–20%), still some showers
Sailing Conditions: Winds 15–30 km/h; moderate seas
Wave Height: ~1 m; up to 2 m offshore; >2 m in storms