Hi, i'm planning go to Taiwan on early of July. Is that a good time to go?

Well, generally speaking, July is the typhoon season of this area. Although the climate would still be hot, there would have many heavy rainy days. This would influence the sightseeing a lot. And the possiblitiy of typhoon would be higher during that period of time. Thus you are advised to change the travel plan. As I know, November to May next year is considered the suitable sightseeing time. :)