I planned to go taipei on 16th- 22th august ...what should be the weather there?

Yes, it will be very hot, with the lowest temp of around 26C and the highest one of around 35C, thus summer clothes are most essential then.

That's true. It will be during the typhoon season, so you'd better check the weather report before departure. Generally, the typhoon affects certain areas instead of the whole island as I know.