How will the weather be like for June & September in Taipei?

Generally, it would be hot and wet in June and Sep. with the average temperature of 26-27C. As both of the two months are during the typhoon season, it might make some influence on your trip. Therefore, it is necessary to pay attention to the weather report before traveling In addition, the rainfall during the two month is a little dense. Prepare rainy coat as well!

Right, considering the weather condition and scenery, it can be good travel season around Oct. and Nov. And May in the first half of the year is also suggested.