Malaysia is located right on the Equator, which makes it one of the most tropical and humid places on the entire planet. Couple this with the urban surroundings, Kuala Lumpur's weather being hot is pretty much a given. A good thing to keep in mind when you're packing is to bring as many summer clothes as you can, and when you're in KL, stop by the many eateries to cool down with a beverage every now and then.