January in Borgarnes is the cloudiest month of the year. In January, the weather in Borgarnes is typically cold. Average daily high temperature in January is about 1 degree above zero. On average, Borgarnes has 17 rainy, 6 snowy, 4 cloudy, 3 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 Borgarnes.