I will visit to Taiwan on 28/08/2011 - 03/09/2011. what is the weather expected on that period?

It is hot and wet during that period in Taiwan. The average temperature is about 24~31C. There may be much rain during that time. Typhoon also has possiblity to happen at that period. You need to wear cool and bring an umbrella with you. Be caution of the unexpected typhoon.