January in Wicklow is the coldest month of the year. In January, the weather in Wicklow is typically cold. Average daily high temperature in January is about 6 degrees above zero. On average, Wicklow has 14 rainy, 8 cloudy, 7 partly cloudy, and 2 sunny days in January. The rains are usually heavy. January as well as February, March, April, and May is considered the most uncomfortable time to visit Wicklow.