Answered by Collan from Germany | Sep. 21, 2013 21:31
It will be a little cold in Urumqi at that time. According to the records of past years, sunny days would be the majority, but the lowest temperature may fall to nearly 0C and the highest temperature would be around 13C. Turpan shall be a little warmer and it would be fine, with the temperature range of 4-15C. The weather condition is Lanzhou is the same as that at Turpan to some degree.
Xian will have the temperature range of 5C to 18C and cloudy days shall be more frequent. Cardigan and thin sweater can be ok.