June in San Jose is the hottest month of the year. In June, the weather in San Jose is typically hot. Average daily high temperature in June is about 28 degrees above zero. On average, San Jose has 24 rainy, 4 partly cloudy, 1 sunny, and 1 cloudy day in June. The rains are usually heavy. June as well as January, February, March, and April is considered the most uncomfortable time to visit San Jose.