May in New Glasgow is the rainiest month of the year. In May, the weather in New Glasgow is typically warm. Average daily high temperature in May is about 12 degrees above zero. On average, New Glasgow has 22 rainy, 4 sunny, 4 cloudy, and 1 partly cloudy day in May. The rains are usually heavy. May as well as April, November, and December is considered the most uncomfortable time to visit New Glasgow.