In July, the weather in Vestmannaeyjar is typically warm. Average daily high temperature in July is about 13 degrees above zero. On average, Vestmannaeyjar has 16 rainy, 8 partly cloudy, 4 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 Vestmannaeyjar.