The township's portion includes Bake Oven Knob, the highest elevated location in Lehigh County at 1,585 feet (483 m).

Its villages include Diebertsville, Germans Corners, Germansville (both pronounced with a hard "g",) Jordan Valley, Lochland (also in Lynn Township), Pleasant Corners, and Saegersville.

Almost all of it drains into the Lehigh River (mainly by Jordan Creek which starts in Heidelberg), except for a very small area in the southwest portion that is drained by tributaries of Ontelaunee Creek leading to the Schuylkill River.

The township has a humid continental climate (Dfa/Dfb) and the hardiness zones are 6a and 6b.

Average monthly temperatures in Germansville range from 27.6 °F (−2.4 °C) in January to 72.4 °F (22.4 °C) in July.

15.2% of all households were made up of individuals, and 4.9% had someone living alone who was 65 years of age or older.