July in Newtown St Boswells is the warmest month of the year. In July, the weather in Newtown St Boswells is typically warm. Average daily high temperature in July is about 18 degrees above zero. On average, Newtown St Boswells has 16 rainy, 10 partly cloudy, 3 cloudy, and 2 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 Newtown St Boswells.