October in Koh Lanta Yai is the coldest month of the year. In October, the weather in Koh Lanta Yai is typically hot. Average daily high temperature in October is about 28 degrees above zero. On average, Koh Lanta Yai has 30 rainy and 1 sunny day in October. The rains are usually heavy. October as well as April, May, June, and July is considered the most uncomfortable time to visit Koh Lanta Yai.