I would like to visit Shanghai from 2 Aug to 10 Aug. Is this a good time to visit Shanghai?

Personally, it is suggested not to go there in August. It is the hottest month and also the month with the largest quantity of rain throughout the year, with the average temperature of 28C. However, for you from Malaysia, the hot weather may be not a problem. So you may go there if you want. And summer clothes and an umbrella are most needed.