May in Saint-Ouen is the rainiest month of the year. In May, the weather in Saint-Ouen is typically warm. Average daily high temperature in May is about 17 degrees above zero. On average, Saint-Ouen has 19 rainy, 7 sunny, 3 partly cloudy, and 2 cloudy days in May. The rains are usually moderate. May as well as January, February, November, and December is considered the most uncomfortable time to visit Saint-Ouen.