January in Kerrville is the coldest month of the year. In January, the weather in Kerrville is typically warm. Average daily high temperature in January is about 13 degrees above zero. On average, Kerrville has 16 sunny, 12 partly cloudy, and 3 rainy days in January. The rains are usually light. January as well as May, August, September, and December is considered the most uncomfortable time to visit Kerrville.