Average monthly water temperature in Koh Samui, Thailand

On this page you find the mean water temperature over the year in Koh Samui (Surat Thani Province), Thailand. Discover the unique water temperature patterns, from its warmest to its coolest months.

Koh Samui offers consistently warm water temperatures year-round. The warmest month, April, averages 30°C (86°F).

Even in the coolest water temperature month, January, the average temperature is 27°C (81°F). These conditions are perfect for water activities and relaxation throughout the year.

Koh Samui 3-Day Forecast

10-Day Forecast

More climate data for Koh Samui

Temperature Rainfall Sunshine Humidity Water Temp

See the full Koh Samui climate overview or explore weather in Thailand.

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