Over the next 10 days Koh Samui tops out around 88° (Friday) and dips to 81° on the coolest night (Tuesday). Models drop roughly 0.69 in of precipitation across the stretch — watch Monday (75%). Hold onto the patio furniture Monday: gusts could hit 37 mph. Longer view: a tropical climate — warm all year, with the calendar split into wet and dry rather than hot and cold.
Koh Samui, Thailand · 9.51°N, 100.01°E · Asia/Bangkok · Forecast computed for these exact coordinates