January in Paso Robles is the rainiest month of the year. In January, the weather in Paso Robles is typically warm. Average daily high temperature in January is about 15 degrees above zero. On average, Paso Robles has 17 sunny, 8 partly cloudy, 5 rainy, and 1 cloudy day in January. The rains are usually moderate. January as well as February and December is considered the most uncomfortable time to visit Paso Robles.