In July, the weather in Sandnessjoen is typically warm. Average daily high temperature in July is about 13 degrees above zero. On average, Sandnessjoen has 15 rainy, 7 partly cloudy, 6 sunny, and 3 cloudy days in July. The rains are usually heavy. July as well as January, February, March, and April is considered the most uncomfortable time to visit Sandnessjoen.