May in Bloomingdale is the rainiest month of the year. In May, the weather in Bloomingdale is typically warm. Average daily high temperature in May is about 19 degrees above zero. On average, Bloomingdale has 16 rainy, 7 sunny, 6 partly cloudy, and 2 cloudy days in May. The rains are usually heavy. May as well as March, April, November, and December is considered the most uncomfortable time to visit Bloomingdale.