Hi, travelling in Wuxi, you should not miss Taihu Lake (Tai Lake), Li Garden and Three Kingdom City. While in Shanghai, you should not miss The Bund & Huangpu River, Zhujiajiao, Yuyuan Garden and Nanjing Road. You can refer to Shanghai Tour Packages(https://www.travelchinaguide.com/package/shanghai.htm) to find more morth seeing places and make a convenient itinerary.
The temperature now is about 12-18C. It is cool and may be a little cold at night. You'd better pay attention to the weather forecast.