May in Argenteuil is the rainiest month of the year. In May, the weather in Argenteuil is typically warm. Average daily high temperature in May is about 17 degrees above zero. On average, Argenteuil 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 Argenteuil.