My name is Nik Zainal, i'm from Malaysia and travelling to Nantong this July 23rd, 2015.

According to the weather forecast, the temperature will be 77 F to 81 F. It's warm and comfortable. T-shirts, jeans and other summer clothes are enough for you to prepare.
There is no bullet train between these two places. Just have normal speed train. The duration is about 9 hours.
If by taking long-distance bus, it takes around 2.5 hours on the way.