In downtown Chengdu, the weather will be very comfortable in early Nov. Most of the day is sunny, and the avarage temperature is over 10C degrees during daytime. Well, a good idea to visit Jiuzhaigou and Huanglong when the naturel scenery there is the most beautiful throughout a year. But, please take some warm clothes with you. The best transport should be take a flight which just cost no more than one hour.