October to December is the ideal time to visit Bhutan as the air is clear and fresh with sunny skies. January and February are colder, but from then until April the climate remains dry and pleasant and in late spring the famous rhododendrons bloom spectacularly, flooding the valleys with color. Heat and humidity increase from May, and from June to September the monsoon rains cover the mountains. If you’re interested in seeing the rare black-necked cranes, we recommend visiting the Phobjikha Valley between late October and mid-February.
Himalayan Vista Suggest you either Visit from October to December or April to May. If you are on a tight budget then you can visit June to August and January to February.