Ko Samui Water Temperature
30°C / 86°F
The measurements for the water temperature in Ko Samui, Surat Thani are provided by the daily satellite readings provided by the NOAA. The temperatures given are the sea surface temperature (SST) which is most relevant to recreational users.
Monthly average water temp
Monthly average max / min water temperatures
The graph below shows the range of monthly Ko Samui water temperature derived from many years of historical sea surface temperature data.
The warmest water temperature is in May with an average around 86.2°F / 30.1°C. The coldest month is January with an average water temperature of 81.9°F / 27.7°C.
7 day tide forecast for Ko Samui
*These tide times are estimates based on the nearest accurate location (Pulau Besin, Myanmar) and may differ by up to half an hour depending on distance. Please note, the tide times given are not suitable for navigational purposes.