July weather forecast in Portsmouth

July in Portsmouth is the hottest month of the year. In July, the weather in Portsmouth is typically hot. Average daily high temperature in July is about 29 degrees above zero. On average, Portsmouth has 14 rainy, 11 sunny, and 6 partly cloudy days in July. The rains are usually heavy. July as well as January, February, March, and June is considered the most uncomfortable time to visit Portsmouth.