January weather forecast in Castlebar

January in Castlebar is the windiest and the coldest month of the year. In January, the weather in Castlebar is typically cold. Average daily high temperature in January is about 7 degrees above zero. On average, Castlebar has 25 rainy, 3 sunny, and 3 cloudy 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 Castlebar.