Weather in Koh Samui in January

Average daily temperatures

Days are usually hot with balmy evenings, so visitors should pack light and cool clothing. The average daily maximum is 29 C and the average daily minimum is 23 C.

Sunshine and rainfall

There is a 33% chance of a perfect sunny day and a 67% chance of seeing some clouds, with on average 96mm of rainfall this month.

Best time to be on the beach

It’s a great time of year to swim in the sea, with the water at an average temperature of 29 C.