Generally, this will be a good time to traveling in China considering the weather condition. Beijing and Xian will be in autumn when the days are sunny and somewhat cool in early morning. Please prepare long-sleeved shirt and thin jacket. Chengdu almost has the same weather but much milder. Shanghai will be humid since the rainfall but the temperature is hot at noon.

Lijiang, Kunming and Guilin is humid due to the plenty of rainfall which always happens from Spe to Oct, but not cold at all. Please prepare long-sleeved waterproof clothes and shoes. Anyway, still a long time to your travle, you'd better pay attention to the up-to-date weather forecast before leaving.