January weather forecast in San Jose

January in San Jose is the rainiest and the cloudiest month of the year. In January, the weather in San Jose is typically warm. Average daily high temperature in January is about 14 degrees above zero. On average, San Jose has 10 rainy, 8 partly cloudy, 7 cloudy, and 6 sunny days in January. The rains are usually heavy. January as well as February and December is considered the most uncomfortable time to visit San Jose.