Tips for European travel - Packing Tips
The weather throughout Europe is seasonal and changeable. In addition to researching the likely weather conditions of your destination, try to pack clothes that can be layered so you are able to adapt to changes in temperature without having to overpack. You should bring an umbrella and light waterproof jacket at any time of year.
To use U.S. electrical equipment in Europe you will need to purchase plug adapters and a voltage converter. Unless they are essential, it is easier to leave electronics at home.
Travel in Europe inevitably involves a lot of walking, often on cobbled streets and narrow steps. This means you will definitely need to bring at least one pair of comfortable walking shoes.