Its always a good idea to check the weather conditions before you head out on your adventure. Doing this can give you a heads up on what you will need to pack for up to 5 days ahead of time. It could be Bali as in WWM's case or in my case Newfoundland, its always nice to know what to expect. HEre are a couple good links for checking the weather through out the world.
Both of these will give you info for cities around the world.
The last thing you need is to get caught in a snow storm wearing a pair of shorts!!!