For cultural sightseeing it is possible to visit Bhutan for most of the year, with the optimum weather occurring in the autumn between late September and late November. 

Springtime, from March to May, is the next best alternative and, although skies are in general cloudier in spring, it is the best time to see the country in blossom, especially the delightful Rhododendron forests. 

The winter period, from December to February, can be cool and pleasant by day, but cold at night, and it is possible to see snowfall at lower altitudes. 

The period from June to August is the Monsoon season and is generally overcast, obscuring the peaks and prone to very heavy rain, which can also lead to flooding in some areas, with the potential of overland travel disruption.

Temperatures vary enormously not only by season but altitude. As a guide, temperatures in Paro vary from -6º C at night to 9º C by day in January rising to 15º C at night and 27º C by day whilst Thimphu ranges from - 3º C at night to 12º C by day in January rising to 16º C by night and 25º C by day in August.

If you wish to include one of Bhutan’s beautiful and substantial treks into your itinerary, the most practical times to visit are in spring and autumn, depending upon your route.