Answered by Erik from Taiwan | Aug. 19, 2013 08:58
Early Sept in Taiwan will still be quite hot. You can expect summer like weather just like Singapore. I usually wear shorts and sandals in Taiwan till Nov. Taipei is a basin rimmed by mountains so we don't get the evening cooling breeze as in Singapore. (just spend the last 3 years in Singapore, living across the street from the Thai Embassy on Orchard)
You can travel light. Just pack a light wind breaker for the 4.5 hr flight. Also pack a compact umbrella anytime. Rain showers can happen anytime of the day.