Trip to Bhutan can be planned throughout the year but best months are Mar, April, May, September, October, November. Also there are several festivals taking place during these months, offering an added attraction. Winter in Bhutan is from mid November to mid March and at this time of the year, climate is dry and sunny for the most parts with perfect blue sky, temperatures peaking at around 15c in the daytime and falling below zero at night. The monsoon usually arrives in mid-June, with light rain falling mainly in the afternoons and evenings.