Is Jiuzhaigou cold in September?

Jiuzhaigou National Nature Reserve belongs to the plateau humid climate, and the temperature rises rapidly in summer and autumn, but the altitude is high, and the temperature difference between day and night is also large. The average temperature in Jiuzhaigou in September is 19℃ to 22℃, and it is cold at night, so it is necessary to prepare some warm clothes. The sun is strong during the day, so it is necessary to wear long-sleeved clothes and apply sunscreen. In addition, the rainy season in Jiuzhaigou is mainly from June to August, and there may be sudden rainfall in September. Please be prepared for rain. Generally speaking, Jiuzhaigou has a pleasant climate in September, but it is necessary to keep warm and rain-proof at night.