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There's an interesting article i came across about why Japan is so fond of 28C / 82F. I haven't checked the veracity of what's written in it but according to the article, in 2005 the Japanese governent started promoting "cool biz" for summer months in order to save energy. Men would leave their jackets and neckties at home and use short sleeved shirts as well. And in the office, ac temperatures would be set to 28C to save electricity.
Why 28C you ask? It seems that it's because 28C is the limit at which HEATSTROKE doesn't set in. Also it's the legal limit for office temperatures in Japan.
I don't know about you but any temperature that is just about to cause heatstroke certainly sounds hot (and unhealthy) to me.
http://news.infoseek.co.jp/article/20110701jcast20112100257?p=2