It is spring in March in Jiuzhaigou. With an average temperature of between 6C(42.8F) and 12C (53.6F), it is not as mild as most places in China. The temperature here also varies greatly between day and night although it enjoys plenty of sunshine during the day. Besides appropriate sun block and a thin T-shirt for the daytime, several warm overcoats are also necessary when you come here in spring. Anyhow, it is OK to visit Jiuzhaigou in March.