February in Koh Lanta Yai is the sunniest and the hottest month of the year. In February, the weather in Koh Lanta Yai is typically hot. Average daily high temperature in February is about 30 degrees above zero. On average, Koh Lanta Yai has 13 partly cloudy, 7 cloudy, 5 sunny, and 4 rainy days in February. The rains are usually heavy.