Taking into account the local weather in Argenteuil is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually August and July with an average temp of 66°F, while the coldest months are January and February with an average of 42°F. The snowiest months in Argenteuil are February, March, January, and April, with each month seeing an average of 6 inches of snowfall.