What clothes should I bring to Xi 'an for business next week? How's the weather?

I am from Xi, and I often travel to other places on business. I feel that the air quality in cities all over the country is the same. It has been cloudy in Xi recently. It is estimated that it will rain soon, and the temperature is about 10-20 degrees. Just wear it in spring and autumn, don't wear it too thin, after all, it will be quite cold sooner or later.