Will be in Beijing and Shanghai from March 14th to 22nd March,2016. how will be the weather?

For BJ, it will be sunny and cloudy during that time. Generally, it shall get warm, but has large temp difference between daytime and nighttime, with the range of 2C to 22C. For Shanghai, it can be a little cool, with the temp ranging from 7C to 16C. Showers may frequently happen and you can still get several cloudy days. Considering all, I suggest you prepare overcoat, long john, thick long-sleeved shirt, light sweater and jeans, as well as rain gear.