the temps that I've seen don't seem all that extream to me. I suppose it's mostly because they aren't used to these temps.
an important thing to know if you have elderly people in these conditions and no A/C, fill the bathtub with cool water and spend your afternoons in it. just sit back, cool off, read a good book, and drink all the water you can get down.
I had heatstroke about 10 years ago. it almost killed me, I lost 30 pounds in one day. had the mother of all hangovers for about 3 or 4 days.
oh, and that reminds me of another thing. don't drink, the cold beer may feel great going down but it takes water out of your system.