For the rainy day urine is particularly large, belongs to the normal physiological phenomenon, we do not need to panic. Under normal circumstances, the metabolic discharge of water from the body can be discharged through the respiratory tract, evaporation from the body surface, urine, feces and other ways. The metabolism of water in the human body has a certain relationship with drinking water, physical condition, diet, environmental temperature, environmental humidity, etc. In rainy days, due to the cold environment, low ambient temperature and high ambient humidity, the evaporation of water from the body surface is reduced and the formation of urine is increased, resulting in increased urination. On the contrary, in a high temperature environment, urine discharge is reduced due to more evaporation from the body surface. Therefore, according to different environments, we should adjust our diet and water intake in time to achieve physiological balance.