January in Guadalajara is the coldest month of the year. In January, the weather in Guadalajara is typically warm. Average daily high temperature in January is about 25 degrees above zero. On average, Guadalajara has 19 sunny, 7 partly cloudy, 3 cloudy, and 2 rainy days in January. The rains are usually light. January as well as February and December is considered the most comfortable time to visit Guadalajara.