The best time to visit Bhutan is in spring (March-May) and Autumn/fall (Sep-Nov). Summer (Jun-Aug) could get tricky with early arrival of monsoon. But if monsoon is pushed further then June is great for traveling. Monsoon will be in full swing by early July. Fall (Sep-Nov) is the crowded tourist season during when weather gets mild despite cold mornings and evenings. Winter (Dec-Feb) Bhutan may see some snowfall but good to travel to avoid hustle bustle of the peak tourist season.