July in Barrow-in-Furness is the warmest month of the year. In July, the weather in Barrow-in-Furness is typically warm. Average daily high temperature in July is about 17 degrees above zero. On average, Barrow-in-Furness has 21 rainy, 8 sunny, and 2 partly cloudy days in July. The rains are usually heavy. July as well as January, February, March, and August is considered the most uncomfortable time to visit Barrow-in-Furness.