During the day time, it would be perfectly alright to wearT-shirts and shorts, but during the evening time, temperature falls rapidly and it becomes really cold. You need jacket and pullover. In case you become interested to trek above 4000 meters above sea level, you require warm woolen clothes. Rain and snowfall happens in the months of June and July, and this is when one requires wind cheaters and raincoats. If you want to trek, make sure to carry pair of waterproof shoes.