Ko Samui

What is the climate like in Ko Samui?

The best time to visit Ko Samui is typically February – March, with trip comfort peaking in March (7.4/10). Ko Samui is warmest in May, when daily highs average 85°F (30°C), and coolest in December, when lows fall to about 79°F (26°C). The wettest month is typically November and the driest is March; the year sees roughly 67 in (1699 mm) of precipitation.

• Best time to visitFebruary – March — comfort peaks in March (7.4/10)
• Warmest monthMay — average high 85°F (30°C)
• Coolest monthDecember — average low 79°F (26°C)
• Wettest monthNovember (13 in (324 mm))
• Driest monthMarch (1.6 in (40 mm))
• Annual precipitation67 in (1699 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromKo Samui, 15 km away (1969-2025)