May in Brooklyn is the rainiest month of the year. In May, the weather in Brooklyn is typically warm. Average daily high temperature in May is about 19 degrees above zero. On average, Brooklyn has 14 rainy, 7 sunny, 7 partly cloudy, and 3 cloudy days in May. The rains are usually heavy. May as well as January, February, March, and April is considered the most uncomfortable time to visit Brooklyn.