The most pleasant months of the year for Sidney are August, July and June. In Sidney, there are 3 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Sidney with an average high temperature of 79.0°, which ranks it as one of the coolest places in North Dakota. December is the snowiest month in Sidney with 7.6 inches of snow, and 8 months of the year have significant snowfall. There are few days during the summer when the humidity becomes unpleasant.