January in Ennis is the windiest and the coldest month of the year. In January, the weather in Ennis is typically cold. Average daily high temperature in January is about 7 degrees above zero. On average, Ennis has 24 rainy, 4 sunny, 2 partly cloudy, and 1 cloudy day in January. The rains are usually heavy. January as well as February, March, April, and May is considered the most uncomfortable time to visit Ennis.