January in Islandia is the coldest month of the year. In January, the weather in Islandia is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Islandia has 13 partly cloudy, 9 sunny, 6 rainy, and 3 cloudy days in January. The rains are usually heavy. January as well as February, March, and December is considered the most uncomfortable time to visit Islandia.