July in Vicksburg is the rainiest, the cloudiest, and the hottest month of the year. In July, the weather in Vicksburg is typically hot. Average daily high temperature in July is about 32 degrees above zero. On average, Vicksburg has 16 rainy, 9 sunny, and 6 partly cloudy days in July. The rains are usually heavy. July as well as August and December is considered the most uncomfortable time to visit Vicksburg.