January weather forecast in San Diego

January in San Diego is the rainiest and the coldest month of the year. In January, the weather in San Diego is typically warm. Average daily high temperature in January is about 16 degrees above zero. On average, San Diego has 13 sunny, 8 partly cloudy, 6 rainy, and 4 cloudy days in January. The rains are usually moderate. January as well as February, March, and December is considered the most uncomfortable time to visit San Diego.