well, two years ago i experimented 42 ºC in the south of Portugal and the feeling was horrible (dificulty to breath similar when it is too cold) but this time it has not been that hard even though we are having +40 ºC for several days now. There is a dust cloud coming from Africa so the sun is not that strong.
Well, for us the problem is the amount of sweat we produce, at 08 am i am sweating like crazy even with no efforts being made. The animals sleep all day almost. The plants (vegetables) are suffering a lot of course and like the other guy said, shade is necessary.