July in Berwick-upon-Tweed is the rainiest and the warmest month of the year. In July, the weather in Berwick-upon-Tweed is typically warm. Average daily high temperature in July is about 16 degrees above zero. On average, Berwick-upon-Tweed has 21 rainy, 7 cloudy, and 3 sunny days in July. The rains are usually moderate. July as well as January, February, May, and June is considered the most uncomfortable time to visit Berwick-upon-Tweed.