Is there any places of interest to visit Harbin in End Aug/Early Sept 2017? How many days needed?

Normally, two or three days are sufficient to tour the city in summer. You are recommended to visit the St. Sophia Church, Central Street, Sun Island Scenic Area on the first day and spend the whole day visiting the Siberian Tiger Park on the second day. If you still have time, you may also visit the Dragon Tower or Harbin Polarland.