The coldest place in Switzerland during the summer is generally considered to be the Glattalpsee, a small alpine lake located in Canton Schwyz at an elevation of 1,852 meters. Due to its unique topographical position—a deep, bowl-shaped valley where cold air pools—it holds the record for some of the lowest temperatures in the country, even in the peak of July. While cities like Zurich might be experiencing 30°C (86°F), it is not uncommon to find floating ice on the surface of Glattalpsee and patches of snow in the surrounding valley. For those seeking "eternal winter," the Theodul Glacier above Zermatt is another prime location, as it remains cold enough for summer skiing and snowboarding throughout the year. The Jungfraujoch, known as the "Top of Europe," also maintains freezing or near-freezing temperatures year-round at its 3,454-meter observatory. If you are visiting these areas in 2026, it is essential to dress in heavy layers even in mid-August, as the combination of high altitude and the surrounding glaciers creates a microclimate that feels like a different season compared to the warm Swiss lowlands.