If you are wondering whether nightlife in Split is still active at the end of summer 2021, the answer is yes.
There are still many young people in Split, and everyone is having a great time. I would say that experience of the town in mid-September is better than during busy months July and August, due to fresh weather and fewer crowds.
It seems that the coronavirus pandemic didn't really affect young people's wish to travel: they seem to be really enjoying the town known for its Diocletian's Palace and beautiful beaches which are nightlife spots as well.
Come here as soon as possible to experience the last vibes of summer season 2021.
If you come to Split in September 2021, you will still have a chance to enjoy all the tourist facilities that the town offers, including island hopping tours and one-day excursions.