I am planning on touring Yunnan in October. What clothing should I take with me?

October is the rainy season in Kunming, Dali and Lijiang, the temperature is around 15C-18C in the daytime. The temperature varies greatly between day and night, so I suggest you take a rain coat plus the light overcoat with you. By the way, if you also go to Shangri-la, the temperature will be lower and warmer clothing will be needed.