The most pleasant months of the year for Grafton village are August, June and July. In Grafton village, there are 4 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Grafton village with an average high temperature of 80.5°, which ranks it as cooler than most places in Wisconsin. January is the snowiest month in Grafton village with 12.9 inches of snow, and 6 months of the year have significant snowfall. July is the most humid month, though humidity is low for most of the year.