Krabi shares the same climate as other Andaman Coast destinations, such as Phuket. The rainy season lasts from roughly May to October each year, although there can be big variations from year to year as to when the rains come, and how wet the season is. The rainy season is not necessarily a bad time to visit Thailand, but if you are planning on sunning yourself on a beach, in June, then you might want to consider a destination south of the equator, such as Bali.