Visiting local bars in Yarmouth is more fun when you know what the weather holds. These temperatures and rainfall averages can help you decide the best time for bar hopping. The hottest months are usually August and July with an average temp of 61°F, while the coldest months are February and January with an average of 34°F. The snowiest months in Yarmouth are January, February, March, and November, with each month seeing an average of 9 inches of snowfall.