The most pleasant months of the year for Germantown are August, June and July. In Germantown, there are 4 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Germantown with an average high temperature of 80.8°, which ranks it as cooler than most places in Wisconsin. January is the snowiest month in Germantown with 14.0 inches of snow, and 6 months of the year have significant snowfall. But there some days when the humidity becomes unpleasant, especially in July and August.