What's the weather like in Beijing in September? What clothes should I wear when I plan to travel from Guangdong to Beijing in September 10? Will it be cold to go to Badaling Shuiguan Great Wall?

September is not cold. When you visit the Great Wall, you usually return to the city on the same day. You won't spend the night on the mountain, but if you want to stay at the foot of the Great Wall, you'd better take a long-sleeved dress. It's cold in the mountains at night. You can wear whatever you want when you come to Beijing in summer, but you'd better check the weather forecast before you come, in case there is cold air or something, it may be cooler.