Hi! I would like to come to Taiwan in September but is it still Typhoon season

Yes, you are right. The Sep. is still the typhoon season, but of course there is a part that is safe from typhoon.
However, it is hard to tell when is the time. It is suggested to pay attention on the weather forecast in advance.

Sep is typhoon season that means a bigger chance having typhoon but doesn't mean it will have typhoon. We have a few years without typhoons in Sep.

Folks, don't panic. It's like hurricane in Florida. It happens all the time but people still go visiting.

Relax and enjoy shopping, eating, and sightseeing.