July in Lai Châu is the rainiest month of the year. In July, the weather in Lai Châu is typically warm. Average daily high temperature in July is about 27 degrees above zero. On average, Lai Châu has 30 rainy and 1 sunny day in July. The rains are usually heavy. July as well as May, June, August, and September is considered the most uncomfortable time to visit Lai Châu.