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

Gulf of Thailand Weather Forecast (Samui/Phangan/Tao/Surat Thani) August 17 to 22 August, 2025.

Sunday, August 17
Temperature: 32–26°C
Weather: Heavy rain, 60% of area
Sailing Conditions: Moderate, waves up to 2 m
Tide: Low tide morning, rising midday

Monday, August 18
Temperature: 33–27°C
Weather: Heavy rain, 40% of area
Sailing Conditions: Moderate, waves 1.5–2 m
Tide: High tide early morning, low tide afternoon

Tuesday, August 19
Temperature: 33–27°C
Weather: Heavy rain, 40% of area
Sailing Conditions: Moderate, waves up to 2 m
Tide: Low tide morning, rising later

Wednesday, August 20
Temperature: 33–27°C
Weather: Heavy rain, 40% of area
Sailing Conditions: Moderate, waves 1.5–2 m
Tide: Rising in afternoon

Thursday, August 21
Temperature: 33–27°C
Weather: Heavy rain, 40% of area
Sailing Conditions: Moderate, waves around 2 m
Tide: High tide early afternoon

Friday, August 22
Temperature: 33–27°C
Weather: Heavy rain, 40% of area
Sailing Conditions: Moderate to rough, waves above 2 m during storms
Tide: Lowering in evening