If you are visiting Gangtok in the summer months, carry light woolen clothes and jackets with you for the evening. While mornings can be bright and sunny, the evenings can get colder. For winter months, you must carry heavy woolen like sweaters and jackets. Also carry your scarfs, woolen caps and gloves for the winter months. Do carry proper shoes and socks as you might have to walk a bit to explore Gangtok.