Fall in Bhutan boast the largest festivals, pleasant temperatures, and world-class mountain vistas. From September to November, some of the largest Bhutanese festivals, including the Thimphu Tshechu, take place. This time of year the weather tends to be idyllic, with very little rain. Later in the season, the sky becomes clearer, revealing vivid mountain views. On a clear day at the top of the Dochu La (10,000-foot pass), 200 miles of Himalayan summits are stacked before you.