November in Portsmouth is the rainiest and the cloudiest month of the year. In November, the weather in Portsmouth is typically warm. Average daily high temperature in November is about 11 degrees above zero. On average, Portsmouth has 22 rainy, 4 partly cloudy, 3 sunny, and 1 cloudy day in November. The rains are usually heavy. November as well as January, February, and December is considered the most uncomfortable time to visit Portsmouth.