Hangzhou is a water town in the south of the Yangtze River. May Day is not too hot, the temperature is about 12-30 degrees. In case of large temperature difference between morning and evening, it is best to wear long sleeves and sweaters. If it is short-sleeved, don't forget to bring a thin long-sleeved coat (small enough to fit in a bag) and long-legged pants, which don't need to be too thick. In addition, you must wear comfortable shoes, because you must visit the West Lake when you go to Hangzhou.