July in Negombo is the cloudiest month of the year. In July, the weather in Negombo is typically hot. Average daily high temperature in July is about 28 degrees above zero. On average, Negombo has 29 rainy, 1 sunny, and 1 cloudy day in July. The rains are usually heavy. July as well as March, April, May, and June is considered the most uncomfortable time to visit Negombo.