January in Reykyavik is the windiest and the cloudiest month of the year. In January, the weather in Reykyavik is typically cold. Average daily high temperature in January is about 1 degree above zero. On average, Reykyavik has 20 rainy, 7 snowy, 2 sunny, and 2 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 Reykyavik.