July weather forecast in Plymouth

July in Plymouth is the warmest month of the year. In July, the weather in Plymouth is typically warm. Average daily high temperature in July is about 18 degrees above zero. On average, Plymouth has 21 rainy, 7 sunny, and 3 partly cloudy days in July. The rains are usually heavy. July as well as January, February, March, and October is considered the most uncomfortable time to visit Plymouth.