It's hot today, and it's supposed to be even hotter tomorrow and Friday. Saturday is supposed to be cooler, with a high of only 96°F. I have always felt that if it's going to be hot, it might as well get to 100°F, because then it feels like an accomplishment. 99° is for wimps!
It's about 37°C (body temperature) outside. I suppose 40° would be the equivalent degree of accomplishment.