August in Luang Namtha is the rainiest month of the year. In August, the weather in Luang Namtha is typically warm. Average daily high temperature in August is about 26 degrees above zero. On average, Luang Namtha has 31 rainy days in August. The rains are usually heavy. August as well as May, June, July, and September is considered the most uncomfortable time to visit Luang Namtha.