July in Lai Châu is the rainiest month of the year. In July, the weather in Lai Châu is typically hot. Average daily high temperature in July is about 28 degrees above zero. On average, Lai Châu has 30 rainy and 1 cloudy 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.