In April, the weather in Newtown St Boswells is typically cold. Average daily high temperature in April is about 8 degrees above zero. On average, Newtown St Boswells has 21 rainy, 6 cloudy, 2 sunny, and 1 partly cloudy day in April. The rains are usually light. April as well as January, February, March, and May is considered the most uncomfortable time to visit Newtown St Boswells.