January in Sandnessjoen is the snowiest and the most freezing month of the year. In January, the weather in Sandnessjoen is typically freezing. Average daily high temperature in January is about 1 degree below zero. On average, Sandnessjoen has 20 snowy, 6 sunny, 2 rainy, 2 partly cloudy, and 1 cloudy day in January. The snowfalls are usually heavy.