May in Bahia Blanca is the cloudiest month of the year. In May, the weather in Bahia Blanca is typically warm. Average daily high temperature in May is about 16 degrees above zero. On average, Bahia Blanca has 11 sunny, 9 partly cloudy, 6 rainy, and 5 cloudy days in May. The rains are usually light. May as well as January, June, July, and August is considered the most uncomfortable time to visit Bahia Blanca.