Best time to go to Koh Samui
There are three seasons in Koh Samui. The wet, the dry, and the hot. The best time to visit is the dry season, which lasts from December to February. At this time of year, daytime temperatures hover between the late 20s and early 30s. Either side of these months, you can expect brief but heavy showers, particularly between September and November, but nothing that should put a dampener on your holiday.