Spring (March, April & May)
Spring is one of the best times to visit Bhutan, when the temperature starts to rise and early spring flowers are abundance. The Rhododendron flowering season starts from March blooming over the mountains. The valleys become green and flower starts to bloom. In Spring Bhutan has the most favorable weather conditions for any outdoor activities and it also considered the festive season.
Summer (June, July & August)
Summer is the monsoon season in Bhutan, it will be usually warm during this months. There will be light rainfall in the afternoon and every few days, it is unsafe for trekking.
This is also good time if you want have clear look of the Himalayan Mountains and the lush green mountain valleys, green paddy fields and landscape.