May in Bretton Woods is the rainiest month of the year. In May, the weather in Bretton Woods is typically warm. Average daily high temperature in May is about 14 degrees above zero. On average, Bretton Woods has 23 rainy, 4 sunny, 3 cloudy, and 1 partly cloudy day in May. The rains are usually heavy. May as well as April, June, October, and November is considered the most uncomfortable time to visit Bretton Woods.