Amsterdam (and pretty much the whole of the Netherlands) is one of those places where you sort of always have to be prepared for what the weather might be like. When I pack to go there, I’m always certain to bring cold- and rain-friendly clothing, as well as one or two items in case the sun decides to pop out. I’d rather be prepared than grossly underprepared for any situation. It’s good to pack boots, rain shoes, or any other kind of waterproof shoe just to be safe. Scarves are also a great addition–easy to throw in your bag when you don’t need it, but you’ll be happy when you do need it.