I went to Lanzhou, Jiayuguan and Dunhuang in early September. How's the weather?

I am a native of Jiayuguan, so I will give you a systematic answer.

Clothes: It's a little autumn here, and the temperature difference between day and night is great. The combination of short sleeves+pants+coat is the best. It is necessary to bring a set of autumn trousers. The sweater upstairs is not so thick and exaggerated. Short-sleeved trousers are enough when the temperature is high during the day, and a coat can be added when the temperature is low during the day and night. (daytime temperature is 23℃~30℃, and at night 13℃~20℃)

Drugs: You don't need to bring special drugs except those commonly used in the initial journey. Heatstroke prevention drugs and anti-mosquito drugs are basically not used. Compared with the south, the number of mosquitoes here should be described as "rare".

Skin care products: The sun here is still poisonous. Sunscreen, sunglasses and umbrellas are all necessary.

I hope I can help you. Have a nice trip ~