No, these hurricanes were not caused by climate change. It's september, the natural peak of hurricane season. You have warm water, low or no sheer (wind in the upper atmosphere that can blow thunderstorms away from the center of the storm) and high humidity, all which is what leads to very powerful storms, ex, irma, Jose (and there will be storms behind jose). There is nothing abnormal about this. In fact this isn't the first time there has been 3 hurricanes in the Atlantic, let alone to majors (cat 3 or more), and it won't be the last.
Man is not influencing hurricanes at all, never have, never will. History shows that there have been storms just as strong (way before cars and emissions). In fact claims are that humans have only lead to a .02degree celcious raise in our climate, and that's disputed in many studies to be natural. Remember the poles used to not contain ice (before humans), it wouldn't be out of the relm of natural possibilities for Earth to go back to iceless. Climate change is NATURAL, not manmade.
I could go on but this is a hockey board.