Bhutan has mild weather and is suitable to travel all year round. From March to May and from September to November, the weather is good and visibility is high, making it the best season for hiking and trekking. From June to August, it's the rainy season, but you can appreciate the grandeur of blooming flowers and lush vegetation on the mountain. From December to February, it's the coldest period of the year but it's mainly sunny, and you can clearly see the magnificent mountain scenery. In general, the best time to travel to Bhutan depends on the climate, your interest, as well as the destinations or festivals that you want to visit.
September to November is the Best time to visit Bhutan. In autumn, you can see the most beautiful side of the Himalayas in Bhutan. According to the Ministry of Tourism of Bhutan, most travelers (about 80% of international tourists) want to visit Bhutan in October, so you may need to plan ahead to ensure your preferred accommodation and flights.