The average water temperature of the Tegernsee ranges from 3 degrees in winter to 22 degrees in summer. The lake is usually warmest in July and August, when the lake regularly reaches over 20 degrees Celcius and has the perfect bathing temperature. The warm and indoor pools in the region offer an alternative to the lake.
Even in very hot summers the lake does not get too warm due to its depth as well as the many tributaries and the strong "outflow" in Gmund, the so-called Mangfall. This creates a high water exchange, which leads to excellent water quality and and therefore to one of the cleanest lake in Bavaria. The crystal-clear water of the Tegernsee and its surrounding picture-perfect Alpine landscape make it one of the most beautiful lakes in Bavaria and even Germany. With a maximum depth of almost 73m, a width of around 1.4 km and a length of up to 6.5 km, the Tegernse attracts visitors at any time of the year- All 5 places around the lake (Kreuth, Bad Wiessee, Gmund, Stadt Tegernsee and Rottach-Egern) have a share of the lake and a large number of public lake accesses.