The halacha is you are not supposed to have simcha and one of the ways of having simcha is showering but a normal human being takes a shower at least every other night so during the 9 days maybe you should downgrade it by taking every 3 nights but not taking a shower in the entire 9 days when it is crazy hot and humid outside is pathetic is trying to be machmar which by the way is pathetic i am not a posek hadar but not to take shower the entire 9 days is a little much.
