I will visit to Taiwan on 06/09/2012 - 13/09/2012. what is the weather expected on that period?

At that time, it is still hot and humid. The average temperature could be about 26 C or higher. Since it is still during the typhoon season, the abundant rainfall may happen now and then. Thus apart from the short-sleeved shirt snd dress, you also need take along an umbrella or the rainy coat as you are out. By the way, to pay attention to the weather forecast is strongly suggested then.