January in Morgan Hill is the rainiest month of the year. In January, the weather in Morgan Hill is typically warm. Average daily high temperature in January is about 13 degrees above zero. On average, Morgan Hill has 12 sunny, 11 partly cloudy, 7 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 Morgan Hill.