Weather in Bhutan varies greatly by season. Spring (March-May) and Autumn (Mid-August-October) are warm, with temperatures between 12 and 25 degrees Celsius (53-77 degrees Fahrenheit). Summer (June-Mid-August) is the rainy season with temperatures between 15 and 27 degrees Celsius (59 to 80 degrees Fahrenheit). Winter (November-February) is cold with temperatures between -5 and 16 degrees celsius (23 to 60 degrees Fahrenheit). Back.