April in Sandnessjoen is the rainiest month of the year. In April, the weather in Sandnessjoen is typically cold. Average daily high temperature in April is about 3 degrees above zero. On average, Sandnessjoen has 24 rainy, 5 sunny, and 1 partly cloudy day in April. The rains are usually heavy. April as well as March, May, June, and September is considered the most uncomfortable time to visit Sandnessjoen.