July in Matsuyama is the rainiest month of the year. In July, the weather in Matsuyama is typically warm. Average daily high temperature in July is about 27 degrees above zero. On average, Matsuyama has 22 rainy, 5 sunny, 3 cloudy, and 1 partly cloudy day in July. The rains are usually heavy. July as well as January, February, August, and December is considered the most uncomfortable time to visit Matsuyama.