January in Athlone is the windiest and the coldest month of the year. In January, the weather in Athlone is typically cold. Average daily high temperature in January is about 7 degrees above zero. On average, Athlone has 20 rainy, 6 cloudy, 4 sunny, and 1 partly 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 Athlone.