October like May and September are very good months for China travel. With pleasant day time temperatures and cool evenings, the weather is perfect for touring China.
Avoid the three-day public holiday celebrating National Day on 1 October as traffic on the roads increase substantially along with increased congestion on busses and trains.
In south China, summer clothes are still worn, although a light cardigan for the evening is advisable. In the northern parts though, long-sleeved tops are better as the wind can be cool. Light coats and jackets for evenings are good to have.