January weather forecast in Navan

January in Navan is the coldest month of the year. In January, the weather in Navan is typically cold. Average daily high temperature in January is about 7 degrees above zero. On average, Navan has 13 rainy, 9 partly cloudy, 6 cloudy, and 3 sunny days in January. The rains are usually moderate. January as well as February, March, April, and May is considered the most uncomfortable time to visit Navan.