January in Rancho Cordova is the rainiest and the cloudiest month of the year. In January, the weather in Rancho Cordova is typically warm. Average daily high temperature in January is about 15 degrees above zero. On average, Rancho Cordova has 11 rainy, 9 sunny, 6 partly cloudy, and 5 cloudy days in January. The rains are usually heavy. January as well as December is considered the most uncomfortable time to visit Rancho Cordova.