Bilma features a hot desert climate (Köppen climate classification "BWh"). The town lies deep in the heart of the Sahara Desert, more precisely in the Ténéré, a hyper-arid desert region lying over northeastern Niger and western Chad, and as such is extremely dry, averaging only of measurable precipitation annually. Bilma is also hot during the "winter" months and extremely hot during the summer months and for prolonged periods of time. Average high temperatures in "winter" months surpass , and exceed from April to September inclusively, peaking at in June. The record high temperature is on June 23, 2010.