July in Borgarnes is the warmest month of the year. In July, the weather in Borgarnes is typically warm. Average daily high temperature in July is about 13 degrees above zero. On average, Borgarnes has 15 rainy, 7 cloudy, 5 partly cloudy, and 4 sunny 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 Borgarnes.