We went there in summer time which was very nice weather. A little bit humid but perfect to go and visit the villages and travel around.
The best time to visit Bhutan is during the spring months of March to May and the fall months of September to November. During these times, the weather is pleasant with clear skies, making it ideal for exploring the beautiful landscapes and cultural sites of Bhutan. However, it's important to note that Bhutan has something to offer year-round, so the best time to visit may also depend on your personal preferences and interests.
Please, remember that all travellers are required to book their trip to Bhutan through a licensed tour operator. Your tour agency will be able to handle the end-to-end trip coordination for you from visa application, booking of flights, accommodation and planning of trip itinerary.
Go check out my guide for the best free things to do as well as itineraries and travel tips to make your trip unforgettable.